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annotate scripts/general/idivide.m @ 14115:0b3518c1228a stable
acumarray.m: Reformat long lines
| author | Jordi Gutiérrez Hermoso <jordigh@octave.org> |
|---|---|
| date | Tue, 27 Dec 2011 15:03:35 -0500 |
| parents | c792872f8942 |
| children | 72c96de7a403 |
| rev | line source |
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| 11523 | 1 ## Copyright (C) 2008-2011 David Bateman |
| 7627 | 2 ## |
| 3 ## This file is part of Octave. | |
| 4 ## | |
| 5 ## Octave is free software; you can redistribute it and/or modify it | |
| 6 ## under the terms of the GNU General Public License as published by | |
| 7 ## the Free Software Foundation; either version 3 of the License, or (at | |
| 8 ## your option) any later version. | |
| 9 ## | |
| 10 ## Octave is distributed in the hope that it will be useful, but | |
| 11 ## WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 ## General Public License for more details. | |
| 14 ## | |
| 15 ## You should have received a copy of the GNU General Public License | |
| 16 ## along with Octave; see the file COPYING. If not, see | |
| 17 ## <http://www.gnu.org/licenses/>. | |
| 18 | |
| 19 ## -*- texinfo -*- | |
| 20 ## @deftypefn {Function File} {} idivide (@var{x}, @var{y}, @var{op}) | |
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21 ## Integer division with different rounding rules. |
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22 ## |
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23 ## The standard behavior of integer division such as @code{@var{a} ./ @var{b}} |
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24 ## is to round the result to the nearest integer. This is not always the |
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25 ## desired behavior and @code{idivide} permits integer element-by-element |
| 7627 | 26 ## division to be performed with different treatment for the fractional |
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27 ## part of the division as determined by the @var{op} flag. @var{op} is |
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28 ## a string with one of the values: |
| 7627 | 29 ## |
| 30 ## @table @asis | |
| 31 ## @item "fix" | |
| 32 ## Calculate @code{@var{a} ./ @var{b}} with the fractional part rounded | |
| 33 ## towards zero. | |
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34 ## |
| 7627 | 35 ## @item "round" |
| 36 ## Calculate @code{@var{a} ./ @var{b}} with the fractional part rounded | |
| 37 ## towards the nearest integer. | |
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38 ## |
| 7627 | 39 ## @item "floor" |
| 40 ## Calculate @code{@var{a} ./ @var{b}} with the fractional part rounded | |
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41 ## towards negative infinity. |
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42 ## |
| 7627 | 43 ## @item "ceil" |
| 44 ## Calculate @code{@var{a} ./ @var{b}} with the fractional part rounded | |
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45 ## towards positive infinity. |
| 7627 | 46 ## @end table |
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47 ## |
| 7627 | 48 ## @noindent |
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49 ## If @var{op} is not given it defaults to @code{"fix"}. |
| 7627 | 50 ## An example demonstrating these rounding rules is |
| 51 ## | |
| 52 ## @example | |
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53 ## @group |
| 7627 | 54 ## idivide (int8 ([-3, 3]), int8 (4), "fix") |
| 55 ## @result{} int8 ([0, 0]) | |
| 56 ## idivide (int8 ([-3, 3]), int8 (4), "round") | |
| 57 ## @result{} int8 ([-1, 1]) | |
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58 ## idivide (int8 ([-3, 3]), int8 (4), "floor") |
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59 ## @result{} int8 ([-1, 0]) |
| 7627 | 60 ## idivide (int8 ([-3, 3]), int8 (4), "ceil") |
| 61 ## @result{} int8 ([0, 1]) | |
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62 ## @end group |
| 7627 | 63 ## @end example |
| 64 ## | |
| 65 ## @seealso{ldivide, rdivide} | |
| 66 ## @end deftypefn | |
| 67 | |
| 68 function z = idivide (x, y, op) | |
| 69 if (nargin < 2 || nargin > 3) | |
| 70 print_usage (); | |
| 71 elseif (nargin == 2) | |
| 72 op = "fix"; | |
| 73 else | |
| 74 op = tolower (op); | |
| 75 endif | |
| 76 | |
| 77 if (strcmp (op, "round")) | |
| 78 z = x ./ y; | |
| 79 else | |
| 80 if (isfloat (x)) | |
| 81 typ = class (y); | |
| 82 elseif (isfloat (y)) | |
| 83 typ = class (x); | |
| 84 else | |
| 85 typ = class (x); | |
| 86 if (!strcmp (class (x), class (y))) | |
| 10549 | 87 error ("idivide: incompatible types"); |
| 7627 | 88 endif |
| 89 endif | |
| 90 | |
| 91 if (strcmp (op, "fix")) | |
| 92 z = cast (fix (double (x) ./ double (y)), typ); | |
| 93 elseif (strcmp (op, "floor")) | |
| 94 z = cast (floor (double (x) ./ double (y)), typ); | |
| 95 elseif (strcmp (op, "ceil")) | |
| 96 z = cast (ceil (double (x) ./ double (y)), typ); | |
| 97 else | |
| 98 error ("idivide: unrecognized rounding type"); | |
| 99 endif | |
| 100 endif | |
| 101 endfunction | |
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102 |
| 7627 | 103 %!shared a, af, b, bf |
| 104 %! a = int8(3); | |
| 105 %! af = 3; | |
| 106 %! b = int8([-4, 4]); | |
| 107 %! bf = [-4, 4]; | |
| 108 | |
| 109 %!assert (idivide (a, b), int8 ([0, 0])) | |
| 110 %!assert (idivide (a, b, "floor"), int8([-1, 0])) | |
| 111 %!assert (idivide (a, b, "ceil"), int8 ([0, 1])) | |
| 112 %!assert (idivide (a, b, "round"), int8 ([-1, 1])) | |
| 113 | |
| 114 %!assert (idivide (af, b), int8 ([0, 0])) | |
| 115 %!assert (idivide (af, b, "floor"), int8([-1, 0])) | |
| 116 %!assert (idivide (af, b, "ceil"), int8 ([0, 1])) | |
| 117 %!assert (idivide (af, b, "round"), int8 ([-1, 1])) | |
| 118 | |
| 119 %!assert (idivide (a, bf), int8 ([0, 0])) | |
| 120 %!assert (idivide (a, bf, "floor"), int8([-1, 0])) | |
| 121 %!assert (idivide (a, bf, "ceil"), int8 ([0, 1])) | |
| 122 %!assert (idivide (a, bf, "round"), int8 ([-1, 1])) | |
| 123 | |
| 124 %!error (idivide (uint8(1), int8(1))) |