update packages

[CreaPhase.git] / octave_packages / m / general / bitget.m

diff --git a/octave_packages/m/general/bitget.m b/octave_packages/m/general/bitget.m
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+## Copyright (C) 2004-2012 David Bateman
+##
+## This file is part of Octave.
+##
+## Octave is free software; you can redistribute it and/or modify it
+## under the terms of the GNU General Public License as published by
+## the Free Software Foundation; either version 3 of the License, or (at
+## your option) any later version.
+##
+## Octave is distributed in the hope that it will be useful, but
+## WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+## General Public License for more details.
+##
+## You should have received a copy of the GNU General Public License
+## along with Octave; see the file COPYING.  If not, see
+## <http://www.gnu.org/licenses/>.
+
+## -*- texinfo -*-
+## @deftypefn {Function File} {@var{c} =} bitget (@var{A}, @var{n})
+## Return the status of bit(s) @var{n} of unsigned integers in @var{A}
+## the lowest significant bit is @var{n} = 1.
+##
+## @example
+## @group
+## bitget (100, 8:-1:1)
+## @result{} 0  1  1  0  0  1  0  0
+## @end group
+## @end example
+## @seealso{bitand, bitor, bitxor, bitset, bitcmp, bitshift, bitmax}
+## @end deftypefn
+
+## Liberally based of the version by Kai Habel from octave-forge
+
+function C = bitget (A, n)
+
+  if (nargin != 2)
+    print_usage ();
+  endif
+
+  if (isa (A, "double"))
+    Amax = log2 (bitmax) + 1;
+    _conv = @double;
+  else
+    if (isa (A, "uint8"))
+      Amax = 8;
+      _conv = @uint8;
+    elseif (isa (A, "uint16"))
+      Amax = 16;
+      _conv = @uint16;
+    elseif (isa (A, "uint32"))
+      Amax = 32;
+      _conv = @uint32;
+    elseif (isa (A, "uint64"))
+      Amax = 64;
+      _conv = @uint64;
+    elseif (isa (A, "int8"))
+      Amax = 8;
+      _conv = @int8;
+    elseif (isa (A, "int16"))
+      Amax = 16;
+      _conv = @int16;
+    elseif (isa (A, "int32"))
+      Amax = 32;
+      _conv = @int32;
+    elseif (isa (A, "int64"))
+      Amax = 64;
+      _conv = @int64;
+    else
+      error ("bitget: invalid class %s", class (A));
+    endif
+  endif
+
+  m = double (n(:));
+  if (any (m < 1) || any (m > Amax))
+    error ("bitget: N must be in the range [1,%d]", Amax);
+  endif
+
+  C = bitand (A, bitshift (_conv (1), uint8 (n) - uint8 (1))) != _conv (0);
+
+endfunction
+
+%!error bitget (1);
+%!error bitget (1, 2, 3);
+
+%!test
+%! assert (bitget ([4, 14], [3, 3]), logical ([1, 1]));
+%! pfx = {"", "u"};
+%! for i = 1:2
+%!   for prec = [8, 16, 32, 64]
+%!     fcn = str2func (sprintf ("%sint%d", pfx{i}, prec));
+%!     assert (bitget (fcn ([4, 14]), [3, 3]), logical ([1, 1]));
+%!   endfor
+%! endfor
+
+%!error bitget (0, 0);
+%!error bitget (0, 55);
+
+%!error bitget (int8 (0), 9);
+%!error bitget (uint8 (0), 9);
+
+%!error bitget (int16 (0), 17);
+%!error bitget (uint16 (0), 17);
+
+%!error bitget (int32 (0), 33);
+%!error bitget (uint32 (0), 33);
+
+%!error bitget (int64 (0), 65);
+%!error bitget (uint64 (0), 65);