annotate scripts/miscellaneous/swapbytes.m @ 26600:f6730533820e stable

doc: clean up doc example blocks for accuracy and consistent formatting * bitset.m, circshift.m, idivide.m, int2str.m, integral3.m, num2str.m, rat.m, repelem.m, shiftdim.m, structfun.m, trapz.m, condeig.m, cross.m, qzhess.m, computer.m, fullfile.m, orderfields.m, substruct.m, swapbytes.m, contourc.m, isprime.m, runlength.m, clock.m, date.m: Fix presentation and formatting of example block results. * graphics.cc (Fset): Likewise. * sparse.cc (Fsparse): Likewise.
author Mike Miller <mtmiller@octave.org>
date Tue, 22 Jan 2019 13:45:11 -0800
parents 00f796120a6d
children b442ec6dda5c
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 ## Copyright (C) 2007-2019 David Bateman
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2 ##
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3 ## This file is part of Octave.
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4 ##
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5 ## Octave is free software: you can redistribute it and/or modify it
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6 ## under the terms of the GNU General Public License as published by
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7 ## the Free Software Foundation, either version 3 of the License, or
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8 ## (at your option) any later version.
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9 ##
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10 ## Octave is distributed in the hope that it will be useful, but
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 ## GNU General Public License for more details.
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14 ##
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15 ## You should have received a copy of the GNU General Public License
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16 ## along with Octave; see the file COPYING. If not, see
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17 ## <https://www.gnu.org/licenses/>.
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18
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19 ## -*- texinfo -*-
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20 ## @deftypefn {} {} swapbytes (@var{x})
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21 ## Swap the byte order on values, converting from little endian to big endian
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22 ## and vice versa.
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23 ##
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24 ## For example:
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25 ##
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26 ## @example
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27 ## @group
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28 ## swapbytes (uint16 (1:4))
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29 ## @result{} 256 512 768 1024
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30 ## @end group
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31 ## @end example
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32 ##
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33 ## @seealso{typecast, cast}
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34 ## @end deftypefn
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35
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36 function y = swapbytes (x)
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37
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38 if (nargin != 1)
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39 print_usage ();
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40 endif
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41
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42 cls = class (x);
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43 if (strcmp (cls, "int8") || strcmp (cls, "uint8") || isempty (x))
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44 y = x;
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45 else
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46 if (strcmp (cls, "int16") || strcmp (cls, "uint16"))
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47 nb = 2;
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48 elseif (strcmp (cls, "single")
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49 || strcmp (cls, "int32") || strcmp (cls, "uint32"))
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50 nb = 4;
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51 elseif (strcmp (cls, "double")
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52 || strcmp (cls, "int64") || strcmp (cls, "uint64"))
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53 nb = 8;
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54 else
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55 error ("swapbytes: invalid object of class '%s'", cls);
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56 endif
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57 y = reshape (typecast (reshape (typecast (x(:), "uint8"), nb, numel (x))
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58 ([nb : -1 : 1], :) (:), cls), size (x));
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59 endif
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60
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61 endfunction
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62
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63
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64 %!assert (swapbytes (uint16 (1:4)), uint16 ([256 512 768 1024]))
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65 %!test
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66 %! assert (swapbytes (swapbytes (pi)), pi);
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67 %! assert (swapbytes (swapbytes (single (pi))), single (pi));
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68
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69 ## Test input validation
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70 %!error swapbytes ()
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71 %!error swapbytes (1, 2)
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72 %!error <invalid object of class 'cell'> swapbytes ({1})