Mercurial > hg > octave-lyh
annotate src/ov-range.cc @ 14495:319660795df1
Fix gnuplot error when color values are within eps of each other (bug #35761).
* plot/private/__go_draw_axes__.m: Use %.15e for setting cbrange in gnuplot.
| author | Marco Caliari <marco.caliari@univr.it> |
|---|---|
| date | Sun, 25 Mar 2012 13:53:39 -0700 |
| parents | 29aabe9b37a2 |
| children | e8e86ae3abbc |
| rev | line source |
|---|---|
| 2376 | 1 /* |
| 2 | |
|
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3 Copyright (C) 1996-2012 John W. Eaton |
| 2376 | 4 |
| 5 This file is part of Octave. | |
| 6 | |
| 7 Octave is free software; you can redistribute it and/or modify it | |
| 8 under the terms of the GNU General Public License as published by the | |
| 7016 | 9 Free Software Foundation; either version 3 of the License, or (at your |
| 10 option) any later version. | |
| 2376 | 11 |
| 12 Octave is distributed in the hope that it will be useful, but WITHOUT | |
| 13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 15 for more details. | |
| 16 | |
| 17 You should have received a copy of the GNU General Public License | |
| 7016 | 18 along with Octave; see the file COPYING. If not, see |
| 19 <http://www.gnu.org/licenses/>. | |
| 2376 | 20 |
| 21 */ | |
| 22 | |
| 23 #ifdef HAVE_CONFIG_H | |
| 24 #include <config.h> | |
| 25 #endif | |
| 26 | |
| 3503 | 27 #include <iostream> |
| 2901 | 28 |
| 2376 | 29 #include "lo-ieee.h" |
| 30 #include "lo-utils.h" | |
| 31 | |
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32 #include "defun.h" |
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33 #include "variables.h" |
| 2376 | 34 #include "gripes.h" |
| 35 #include "ops.h" | |
| 3933 | 36 #include "oct-obj.h" |
| 2376 | 37 #include "ov-range.h" |
| 38 #include "ov-re-mat.h" | |
| 2410 | 39 #include "ov-scalar.h" |
| 2376 | 40 #include "pr-output.h" |
| 41 | |
| 4687 | 42 #include "byte-swap.h" |
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43 #include "ls-ascii-helper.h" |
| 4687 | 44 #include "ls-hdf5.h" |
| 45 #include "ls-utils.h" | |
| 46 | |
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47 // If TRUE, allow ranges with non-integer elements as array indices. |
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48 bool Vallow_noninteger_range_as_index = false; |
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49 |
| 3219 | 50 DEFINE_OCTAVE_ALLOCATOR (octave_range); |
| 2376 | 51 |
| 4612 | 52 DEFINE_OV_TYPEID_FUNCTIONS_AND_DATA (octave_range, "range", "double"); |
| 2376 | 53 |
| 5759 | 54 static octave_base_value * |
| 55 default_numeric_conversion_function (const octave_base_value& a) | |
| 2376 | 56 { |
| 57 CAST_CONV_ARG (const octave_range&); | |
| 58 | |
| 59 return new octave_matrix (v.matrix_value ()); | |
| 60 } | |
| 61 | |
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62 octave_base_value::type_conv_info |
| 2376 | 63 octave_range::numeric_conversion_function (void) const |
| 64 { | |
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65 return octave_base_value::type_conv_info (default_numeric_conversion_function, |
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66 octave_matrix::static_type_id ()); |
| 2376 | 67 } |
| 68 | |
| 5759 | 69 octave_base_value * |
| 2410 | 70 octave_range::try_narrowing_conversion (void) |
| 71 { | |
| 5759 | 72 octave_base_value *retval = 0; |
| 2410 | 73 |
| 74 switch (range.nelem ()) | |
| 75 { | |
| 76 case 1: | |
| 77 retval = new octave_scalar (range.base ()); | |
| 78 break; | |
| 79 | |
| 80 case 0: | |
| 4417 | 81 retval = new octave_matrix (Matrix (1, 0)); |
| 2410 | 82 break; |
| 83 | |
| 8971 | 84 case -2: |
| 85 retval = new octave_matrix (range.matrix_value ()); | |
| 86 break; | |
| 87 | |
| 2410 | 88 default: |
| 89 break; | |
| 90 } | |
| 91 | |
| 92 return retval; | |
| 93 } | |
| 94 | |
| 2436 | 95 octave_value |
| 4247 | 96 octave_range::subsref (const std::string& type, |
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97 const std::list<octave_value_list>& idx) |
| 3933 | 98 { |
| 99 octave_value retval; | |
| 100 | |
| 101 switch (type[0]) | |
| 102 { | |
| 103 case '(': | |
| 104 retval = do_index_op (idx.front ()); | |
| 105 break; | |
| 106 | |
| 107 case '{': | |
| 108 case '.': | |
| 109 { | |
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110 std::string nm = type_name (); |
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111 error ("%s cannot be indexed with %c", nm.c_str (), type[0]); |
| 3933 | 112 } |
| 113 break; | |
| 114 | |
| 115 default: | |
| 116 panic_impossible (); | |
| 117 } | |
| 118 | |
| 119 return retval.next_subsref (type, idx); | |
| 120 } | |
| 121 | |
| 122 octave_value | |
| 5885 | 123 octave_range::do_index_op (const octave_value_list& idx, bool resize_ok) |
| 2436 | 124 { |
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125 if (idx.length () == 1 && ! resize_ok) |
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126 { |
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127 octave_value retval; |
| 2436 | 128 |
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129 // The range can handle a single subscript. |
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130 idx_vector i = idx(0).index_vector (); |
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131 if (! error_state) |
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132 { |
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133 if (i.is_scalar () && i(0) < range.nelem ()) |
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134 retval = range.elem (i(0)); |
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135 else |
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136 retval = range.index (i); |
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137 } |
| 2436 | 138 |
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139 return retval; |
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140 } |
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141 else |
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142 { |
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143 octave_value tmp (new octave_matrix (range.matrix_value ())); |
| 2436 | 144 |
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145 return tmp.do_index_op (idx, resize_ok); |
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146 } |
| 2436 | 147 } |
| 148 | |
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149 idx_vector |
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150 octave_range::index_vector (void) const |
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151 { |
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152 if (idx_cache) |
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153 return *idx_cache; |
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154 else |
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155 { |
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156 if (! Vallow_noninteger_range_as_index |
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157 || range.all_elements_are_ints ()) |
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158 return set_idx_cache (idx_vector (range)); |
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159 else |
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160 { |
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161 warning_with_id ("Octave:noninteger-range-as-index", |
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162 "non-integer range used as index"); |
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163 |
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164 return octave_value (matrix_value ()).round ().index_vector (); |
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165 } |
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166 } |
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167 } |
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168 |
| 2376 | 169 double |
| 170 octave_range::double_value (bool) const | |
| 171 { | |
| 4102 | 172 double retval = lo_ieee_nan_value (); |
| 2376 | 173 |
| 5275 | 174 octave_idx_type nel = range.nelem (); |
| 2376 | 175 |
| 4455 | 176 if (nel > 0) |
| 177 { | |
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178 gripe_implicit_conversion ("Octave:array-to-scalar", |
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179 "range", "real scalar"); |
| 4455 | 180 |
| 181 retval = range.base (); | |
| 182 } | |
| 2376 | 183 else |
| 184 gripe_invalid_conversion ("range", "real scalar"); | |
| 185 | |
| 186 return retval; | |
| 187 } | |
| 188 | |
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189 float |
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190 octave_range::float_value (bool) const |
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191 { |
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192 float retval = lo_ieee_float_nan_value (); |
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193 |
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194 octave_idx_type nel = range.nelem (); |
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195 |
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196 if (nel > 0) |
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197 { |
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198 gripe_implicit_conversion ("Octave:array-to-scalar", |
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199 "range", "real scalar"); |
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200 |
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201 retval = range.base (); |
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202 } |
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203 else |
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204 gripe_invalid_conversion ("range", "real scalar"); |
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205 |
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206 return retval; |
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207 } |
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208 |
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209 charNDArray |
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210 octave_range::char_array_value (bool) const |
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211 { |
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212 const Matrix matrix = range.matrix_value (); |
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213 charNDArray retval (dims ()); |
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214 |
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215 octave_idx_type nel = numel (); |
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216 |
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217 for (octave_idx_type i = 0; i < nel; i++) |
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218 retval.elem (i) = static_cast<char>(matrix.elem (i)); |
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219 |
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220 return retval; |
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221 } |
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222 |
| 2376 | 223 octave_value |
| 4017 | 224 octave_range::all (int dim) const |
| 2376 | 225 { |
| 5775 | 226 // FIXME -- this is a potential waste of memory. |
| 2436 | 227 |
| 228 Matrix m = range.matrix_value (); | |
| 229 | |
| 4017 | 230 return m.all (dim); |
| 2376 | 231 } |
| 232 | |
| 233 octave_value | |
| 4017 | 234 octave_range::any (int dim) const |
| 2376 | 235 { |
| 5775 | 236 // FIXME -- this is a potential waste of memory. |
| 4017 | 237 |
| 238 Matrix m = range.matrix_value (); | |
| 239 | |
| 240 return m.any (dim); | |
| 2376 | 241 } |
| 242 | |
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243 octave_value |
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244 octave_range::diag (octave_idx_type k) const |
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245 { |
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246 return (k == 0 |
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247 ? octave_value (DiagMatrix (DiagArray2<double> (range.matrix_value ()))) |
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248 : octave_value (range.diag (k))); |
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249 } |
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250 |
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251 |
| 2376 | 252 bool |
| 253 octave_range::is_true (void) const | |
| 254 { | |
| 255 bool retval = false; | |
| 2436 | 256 |
| 4478 | 257 if (range.nelem () != 0) |
| 2436 | 258 { |
| 5775 | 259 // FIXME -- this is a potential waste of memory. |
| 2436 | 260 |
| 261 Matrix m ((range.matrix_value () . all ()) . all ()); | |
| 262 | |
| 263 retval = (m.rows () == 1 && m.columns () == 1 && m (0, 0) != 0.0); | |
| 264 } | |
| 265 | |
| 2376 | 266 return retval; |
| 267 } | |
| 268 | |
| 269 Complex | |
| 270 octave_range::complex_value (bool) const | |
| 271 { | |
| 4102 | 272 double tmp = lo_ieee_nan_value (); |
| 273 | |
| 274 Complex retval (tmp, tmp); | |
| 2376 | 275 |
| 5275 | 276 octave_idx_type nel = range.nelem (); |
| 2376 | 277 |
| 4455 | 278 if (nel > 0) |
| 279 { | |
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280 gripe_implicit_conversion ("Octave:array-to-scalar", |
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281 "range", "complex scalar"); |
| 4455 | 282 |
| 283 retval = range.base (); | |
| 284 } | |
| 2376 | 285 else |
| 286 gripe_invalid_conversion ("range", "complex scalar"); | |
| 287 | |
| 288 return retval; | |
| 289 } | |
| 290 | |
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291 FloatComplex |
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292 octave_range::float_complex_value (bool) const |
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293 { |
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294 float tmp = lo_ieee_float_nan_value (); |
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295 |
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296 FloatComplex retval (tmp, tmp); |
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297 |
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298 octave_idx_type nel = range.nelem (); |
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299 |
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300 if (nel > 0) |
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301 { |
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302 gripe_implicit_conversion ("Octave:array-to-scalar", |
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303 "range", "complex scalar"); |
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304 |
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305 retval = range.base (); |
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306 } |
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307 else |
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308 gripe_invalid_conversion ("range", "complex scalar"); |
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309 |
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310 return retval; |
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311 } |
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312 |
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313 boolNDArray |
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314 octave_range::bool_array_value (bool warn) const |
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315 { |
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316 Matrix m = range.matrix_value (); |
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317 |
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318 if (m.any_element_is_nan ()) |
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319 gripe_nan_to_logical_conversion (); |
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320 else if (warn && m.any_element_not_one_or_zero ()) |
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321 gripe_logical_conversion (); |
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322 |
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323 return boolNDArray (m); |
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324 } |
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325 |
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326 octave_value |
| 5731 | 327 octave_range::resize (const dim_vector& dv, bool fill) const |
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328 { |
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329 NDArray retval = array_value (); |
| 5731 | 330 if (fill) |
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331 retval.resize (dv, NDArray::resize_fill_value ()); |
| 5731 | 332 else |
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333 retval.resize (dv); |
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334 return retval; |
| 5731 | 335 } |
| 336 | |
| 2376 | 337 octave_value |
| 5279 | 338 octave_range::convert_to_str_internal (bool pad, bool force, char type) const |
| 2449 | 339 { |
| 340 octave_value tmp (range.matrix_value ()); | |
| 5279 | 341 return tmp.convert_to_str (pad, force, type); |
| 2449 | 342 } |
| 343 | |
| 2376 | 344 void |
| 3523 | 345 octave_range::print (std::ostream& os, bool pr_as_read_syntax) const |
| 2901 | 346 { |
| 347 print_raw (os, pr_as_read_syntax); | |
| 348 newline (os); | |
| 349 } | |
| 350 | |
| 351 void | |
| 3523 | 352 octave_range::print_raw (std::ostream& os, bool pr_as_read_syntax) const |
| 2901 | 353 { |
| 354 octave_print_internal (os, range, pr_as_read_syntax, | |
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355 current_print_indent_level ()); |
| 2901 | 356 } |
| 357 | |
| 358 bool | |
| 3523 | 359 octave_range::print_name_tag (std::ostream& os, const std::string& name) const |
| 2376 | 360 { |
| 2901 | 361 bool retval = false; |
| 362 | |
| 5275 | 363 octave_idx_type n = range.nelem (); |
| 2901 | 364 |
| 365 indent (os); | |
| 366 | |
| 367 if (n == 0 || n == 1) | |
| 368 os << name << " = "; | |
| 369 else | |
| 370 { | |
| 371 os << name << " ="; | |
| 372 newline (os); | |
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373 if (! Vcompact_format) |
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374 newline (os); |
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375 |
| 2901 | 376 retval = true; |
| 377 } | |
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378 |
| 2901 | 379 return retval; |
| 2376 | 380 } |
| 381 | |
| 4687 | 382 // Skip white space and comments on stream IS. |
| 383 | |
| 384 static void | |
| 385 skip_comments (std::istream& is) | |
| 386 { | |
| 387 char c = '\0'; | |
| 388 while (is.get (c)) | |
| 389 { | |
| 390 if (c == ' ' || c == '\t' || c == '\n') | |
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391 ; // Skip whitespace on way to beginning of next line. |
| 4687 | 392 else |
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393 break; |
| 4687 | 394 } |
| 395 | |
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396 skip_until_newline (is, false); |
| 4687 | 397 } |
| 398 | |
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399 bool |
| 6974 | 400 octave_range::save_ascii (std::ostream& os) |
| 4687 | 401 { |
| 402 Range r = range_value (); | |
| 403 double base = r.base (); | |
| 404 double limit = r.limit (); | |
| 405 double inc = r.inc (); | |
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406 octave_idx_type len = r.nelem (); |
| 4687 | 407 |
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408 if (inc != 0) |
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409 os << "# base, limit, increment\n"; |
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410 else |
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411 os << "# base, length, increment\n"; |
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412 |
| 4687 | 413 octave_write_double (os, base); |
| 414 os << " "; | |
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415 if (inc != 0) |
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416 octave_write_double (os, limit); |
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417 else |
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418 os << len; |
| 4687 | 419 os << " "; |
| 420 octave_write_double (os, inc); | |
| 421 os << "\n"; | |
| 422 | |
| 423 return true; | |
| 424 } | |
| 425 | |
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426 bool |
| 4687 | 427 octave_range::load_ascii (std::istream& is) |
| 428 { | |
| 429 // # base, limit, range comment added by save (). | |
| 430 skip_comments (is); | |
| 431 | |
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432 double base, limit, inc; |
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433 is >> base >> limit >> inc; |
| 4687 | 434 |
| 435 if (!is) | |
| 436 { | |
| 437 error ("load: failed to load range constant"); | |
| 438 return false; | |
| 439 } | |
| 440 | |
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441 if (inc != 0) |
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442 range = Range (base, limit, inc); |
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443 else |
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444 range = Range (base, inc, static_cast<octave_idx_type> (limit)); |
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445 |
| 4687 | 446 return true; |
| 447 } | |
| 448 | |
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449 bool |
| 4687 | 450 octave_range::save_binary (std::ostream& os, bool& /* save_as_floats */) |
| 451 { | |
| 5760 | 452 char tmp = LS_DOUBLE; |
| 453 os.write (reinterpret_cast<char *> (&tmp), 1); | |
| 4687 | 454 Range r = range_value (); |
| 455 double bas = r.base (); | |
| 456 double lim = r.limit (); | |
| 457 double inc = r.inc (); | |
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458 if (inc == 0) |
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459 lim = r.nelem (); |
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460 |
| 5760 | 461 os.write (reinterpret_cast<char *> (&bas), 8); |
| 462 os.write (reinterpret_cast<char *> (&lim), 8); | |
| 463 os.write (reinterpret_cast<char *> (&inc), 8); | |
| 4687 | 464 |
| 465 return true; | |
| 466 } | |
| 467 | |
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468 bool |
| 4687 | 469 octave_range::load_binary (std::istream& is, bool swap, |
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470 oct_mach_info::float_format /* fmt */) |
| 4687 | 471 { |
| 472 char tmp; | |
| 5760 | 473 if (! is.read (reinterpret_cast<char *> (&tmp), 1)) |
| 4687 | 474 return false; |
| 475 double bas, lim, inc; | |
| 5760 | 476 if (! is.read (reinterpret_cast<char *> (&bas), 8)) |
| 4687 | 477 return false; |
| 478 if (swap) | |
| 4944 | 479 swap_bytes<8> (&bas); |
| 5760 | 480 if (! is.read (reinterpret_cast<char *> (&lim), 8)) |
| 4687 | 481 return false; |
| 482 if (swap) | |
| 4944 | 483 swap_bytes<8> (&lim); |
| 5760 | 484 if (! is.read (reinterpret_cast<char *> (&inc), 8)) |
| 4687 | 485 return false; |
| 486 if (swap) | |
| 4944 | 487 swap_bytes<8> (&inc); |
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488 if (inc != 0) |
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489 range = Range (bas, lim, inc); |
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490 else |
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491 range = Range (bas, inc, static_cast<octave_idx_type> (lim)); |
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492 |
| 4687 | 493 return true; |
| 494 } | |
| 495 | |
| 496 #if defined (HAVE_HDF5) | |
| 4944 | 497 |
| 4687 | 498 // The following subroutines creates an HDF5 representation of the way |
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499 // we will store Octave range types (triplets of floating-point numbers). |
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500 // NUM_TYPE is the HDF5 numeric type to use for storage (e.g. |
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501 // H5T_NATIVE_DOUBLE to save as 'double'). Note that any necessary |
| 4687 | 502 // conversions are handled automatically by HDF5. |
| 503 | |
| 504 static hid_t | |
| 505 hdf5_make_range_type (hid_t num_type) | |
| 506 { | |
| 507 hid_t type_id = H5Tcreate (H5T_COMPOUND, sizeof (double) * 3); | |
| 508 | |
| 509 H5Tinsert (type_id, "base", 0 * sizeof (double), num_type); | |
| 510 H5Tinsert (type_id, "limit", 1 * sizeof (double), num_type); | |
| 511 H5Tinsert (type_id, "increment", 2 * sizeof (double), num_type); | |
| 512 | |
| 513 return type_id; | |
| 514 } | |
| 515 | |
| 516 bool | |
| 517 octave_range::save_hdf5 (hid_t loc_id, const char *name, | |
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518 bool /* save_as_floats */) |
| 4687 | 519 { |
| 4792 | 520 hsize_t dimens[3]; |
| 4687 | 521 hid_t space_hid = -1, type_hid = -1, data_hid = -1; |
| 522 bool retval = true; | |
| 523 | |
| 4815 | 524 space_hid = H5Screate_simple (0, dimens, 0); |
| 4687 | 525 if (space_hid < 0) return false; |
| 526 | |
| 527 type_hid = hdf5_make_range_type (H5T_NATIVE_DOUBLE); | |
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528 if (type_hid < 0) |
| 4687 | 529 { |
| 530 H5Sclose (space_hid); | |
| 531 return false; | |
| 532 } | |
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533 #if HAVE_HDF5_18 |
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534 data_hid = H5Dcreate (loc_id, name, type_hid, space_hid, |
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535 H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT); |
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536 #else |
| 4687 | 537 data_hid = H5Dcreate (loc_id, name, type_hid, space_hid, H5P_DEFAULT); |
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538 #endif |
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539 if (data_hid < 0) |
| 4687 | 540 { |
| 541 H5Sclose (space_hid); | |
| 542 H5Tclose (type_hid); | |
| 543 return false; | |
| 544 } | |
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545 |
| 4687 | 546 Range r = range_value (); |
| 547 double range_vals[3]; | |
| 548 range_vals[0] = r.base (); | |
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549 range_vals[1] = r.inc () != 0 ? r.limit () : r.nelem (); |
| 4687 | 550 range_vals[2] = r.inc (); |
| 551 | |
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552 if (H5Dwrite (data_hid, type_hid, H5S_ALL, H5S_ALL, H5P_DEFAULT, |
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553 range_vals) >= 0) |
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554 { |
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555 octave_idx_type nel = r.nelem (); |
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556 retval = hdf5_add_scalar_attr (data_hid, H5T_NATIVE_IDX, |
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557 "OCTAVE_RANGE_NELEM", &nel) >= 0; |
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558 } |
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559 else |
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560 retval = false; |
| 4687 | 561 |
| 562 H5Dclose (data_hid); | |
| 563 H5Tclose (type_hid); | |
| 564 H5Sclose (space_hid); | |
| 4837 | 565 |
| 4687 | 566 return retval; |
| 567 } | |
| 568 | |
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569 bool |
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570 octave_range::load_hdf5 (hid_t loc_id, const char *name) |
| 4687 | 571 { |
| 572 bool retval = false; | |
| 4837 | 573 |
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574 #if HAVE_HDF5_18 |
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575 hid_t data_hid = H5Dopen (loc_id, name, H5P_DEFAULT); |
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576 #else |
| 4687 | 577 hid_t data_hid = H5Dopen (loc_id, name); |
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578 #endif |
| 4687 | 579 hid_t type_hid = H5Dget_type (data_hid); |
| 580 | |
| 581 hid_t range_type = hdf5_make_range_type (H5T_NATIVE_DOUBLE); | |
| 582 | |
| 583 if (! hdf5_types_compatible (type_hid, range_type)) | |
| 584 { | |
| 4837 | 585 H5Tclose (range_type); |
| 4687 | 586 H5Dclose (data_hid); |
| 587 return false; | |
| 588 } | |
| 589 | |
| 590 hid_t space_hid = H5Dget_space (data_hid); | |
| 591 hsize_t rank = H5Sget_simple_extent_ndims (space_hid); | |
| 592 | |
| 593 if (rank != 0) | |
| 594 { | |
| 4837 | 595 H5Tclose (range_type); |
| 4687 | 596 H5Sclose (space_hid); |
| 597 H5Dclose (data_hid); | |
| 598 return false; | |
| 599 } | |
| 600 | |
| 601 double rangevals[3]; | |
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602 if (H5Dread (data_hid, range_type, H5S_ALL, H5S_ALL, H5P_DEFAULT, |
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603 rangevals) >= 0) |
| 4687 | 604 { |
| 605 retval = true; | |
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606 octave_idx_type nel; |
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607 if (hdf5_get_scalar_attr (data_hid, H5T_NATIVE_IDX, |
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608 "OCTAVE_RANGE_NELEM", &nel)) |
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609 range = Range (rangevals[0], rangevals[2], nel); |
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610 else |
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611 { |
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612 if (rangevals[2] != 0) |
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613 range = Range (rangevals[0], rangevals[1], rangevals[2]); |
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614 else |
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615 range = Range (rangevals[0], rangevals[2], |
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616 static_cast<octave_idx_type> (rangevals[1])); |
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617 } |
| 4687 | 618 } |
| 619 | |
| 4837 | 620 H5Tclose (range_type); |
| 4687 | 621 H5Sclose (space_hid); |
| 622 H5Dclose (data_hid); | |
| 4837 | 623 |
| 4687 | 624 return retval; |
| 625 } | |
| 4944 | 626 |
| 4687 | 627 #endif |
| 628 | |
| 5900 | 629 mxArray * |
| 630 octave_range::as_mxArray (void) const | |
| 631 { | |
| 632 mxArray *retval = new mxArray (mxDOUBLE_CLASS, dims (), mxREAL); | |
| 633 | |
| 634 double *pr = static_cast<double *> (retval->get_data ()); | |
| 635 | |
| 6686 | 636 mwSize nel = numel (); |
| 5900 | 637 |
| 638 Matrix m = matrix_value (); | |
| 639 | |
| 640 const double *p = m.data (); | |
| 641 | |
| 6686 | 642 for (mwSize i = 0; i < nel; i++) |
| 5900 | 643 pr[i] = p[i]; |
| 644 | |
| 645 return retval; | |
| 646 } | |
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647 |
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648 DEFUN (allow_noninteger_range_as_index, args, nargout, |
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649 "-*- texinfo -*-\n\ |
| 10840 | 650 @deftypefn {Built-in Function} {@var{val} =} allow_noninteger_range_as_index ()\n\ |
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651 @deftypefnx {Built-in Function} {@var{old_val} =} allow_noninteger_range_as_index (@var{new_val})\n\ |
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652 @deftypefnx {Built-in Function} {} allow_noninteger_range_as_index (@var{new_val}, \"local\")\n\ |
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653 Query or set the internal variable that controls whether non-integer\n\ |
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654 ranges are allowed as indices. This might be useful for @sc{matlab}\n\ |
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655 compatibility; however, it is still not entirely compatible because\n\ |
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656 @sc{matlab} treats the range expression differently in different contexts.\n\ |
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657 \n\ |
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658 When called from inside a function with the \"local\" option, the variable is\n\ |
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659 changed locally for the function and any subroutines it calls. The original\n\ |
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660 variable value is restored when exiting the function.\n\ |
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661 @end deftypefn") |
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662 { |
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663 return SET_INTERNAL_VARIABLE (allow_noninteger_range_as_index); |
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664 } |
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665 |
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666 /* |
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667 %!test |
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668 %! x = 0:10; |
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669 %! save = allow_noninteger_range_as_index (); |
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670 %! warn_state = warning ("query", "Octave:noninteger-range-as-index"); |
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671 %! unwind_protect |
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672 %! allow_noninteger_range_as_index (false); |
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673 %! fail ("x(2.1:5)"); |
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674 %! assert (x(2:5), 1:4); |
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675 %! allow_noninteger_range_as_index (true); |
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676 %! warning ("off", "Octave:noninteger-range-as-index"); |
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677 %! assert (x(2.49:5), 1:3); |
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678 %! assert (x(2.5:5), 2:4); |
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679 %! assert (x(2.51:5), 2:4); |
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680 %! unwind_protect_cleanup |
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681 %! allow_noninteger_range_as_index (save); |
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682 %! warning (warn_state.state, warn_state.identifier); |
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683 %! end_unwind_protect |
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684 */ |