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1 ## Copyright (C) 2004 David Bateman |
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2 ## |
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3 ## This program is free software; you can redistribute it and/or modify |
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4 ## it under the terms of the GNU General Public License as published by |
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5 ## the Free Software Foundation; either version 2 of the License, or |
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6 ## (at your option) any later version. |
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7 ## |
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8 ## This program is distributed in the hope that it will be useful, |
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9 ## but WITHOUT ANY WARRANTY; without even the implied warranty of |
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10 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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11 ## GNU General Public License for more details. |
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12 ## |
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13 ## You should have received a copy of the GNU General Public License |
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14 ## along with this program; if not, write to the Free Software |
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15 ## Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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16 ## 02110-1301 USA |
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17 |
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18 ## -*- texinfo -*- |
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19 ## @deftypefn {Function File} {@var{X} =} bitcmp (@var{a},@var{k}) |
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20 ## Return the @var{k}-bit complement of integers in @var{a}. If |
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21 ## @var{k} is omitted @code{k = log2(bitmax) + 1} is assumed. |
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22 ## |
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23 ## @example |
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24 ## bitcmp(7,4) |
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25 ## @result{} 8 |
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26 ## dec2bin(11) |
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27 ## @result{} 1011 |
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28 ## dec2bin(bitcmp(11)) |
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29 ## @result{} 11111111111111111111111111110100 |
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30 ## @end example |
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31 ## @end deftypefn |
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32 ## |
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33 ## @seealso{bitand,bitor,bitxor,bitset,bitget,bitcmp,bitshift,bitmax} |
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34 |
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35 ## Liberally based of the version by Kai Habel from octave-forge |
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36 |
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37 function X = bitcmp (A, n) |
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38 |
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39 if (nargin < 1 || nargin > 2) |
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40 usage ("bitcmp (A, n)"); |
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41 endif |
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42 |
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43 if (isa (A, "double")) |
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44 Bmax = bitmax; |
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45 Amax = log2 (Bmax) + 1; |
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46 _conv = @double; |
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47 else |
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48 if (isa (A, "uint8")) |
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49 Amax = 8; |
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50 _conv = @uint8; |
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51 elseif (isa (A, "uint16")) |
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52 Amax = 16; |
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53 _conv = @uint16; |
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54 elseif (isa (A, "uint32")) |
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55 Amax = 32; |
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56 _conv = @uint32; |
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57 elseif (isa (A, "uint64")) |
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58 Amax = 64; |
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59 _conv = @uint64; |
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60 elseif (isa (A, "int8")) |
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61 Amax = 8; |
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62 _conv = @int8; |
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63 elseif (isa (A, "int16")) |
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64 Amax = 16; |
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65 _conv = @int16; |
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66 elseif (isa (A, "int32")) |
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67 Amax = 32; |
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68 _conv = @int32; |
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69 elseif (isa (A, "int64")) |
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70 Amax = 64; |
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71 _conv = @int64; |
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72 else |
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73 error ("invalid class %s", class (A)); |
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74 endif |
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75 Bmax = intmax (class (A)); |
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76 endif |
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77 |
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78 if (nargin == 2) |
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79 m = double (n(:)); |
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80 if (any (m < 1) || any (m > Amax)) |
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81 error ("n must be in the range [1,%d]", Amax); |
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82 endif |
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83 X = bitxor (A, bitshift (Bmax, -int8(n))); |
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84 else |
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85 X = bitxor (A, Bmax); |
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86 endif |
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87 |
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88 endfunction |
