build: Create octave.desktop even when --disable-docs configured (bug #42720). * etc/icons/Makefile.am, etc/icons/octave-logo.ico, etc/icons/octave-logo.png, etc/icons/octave-logo.svg, etc/icons/octave-sombrero.png, etc/icons/octave.desktop.in, etc/icons/octave_branding_samples.svg: Move doc/icons files to /etc/icons directory. * Makefile.am: Add etc/icons to list of SUBDIRS to build. * configure.ac: Change doc/icons to etc/icons. * doc/Makefile.am: Remove icons from list of SUBDIRS to build.

#include <octave/oct.h>

DEFUN_DLD (addtwomatrices, args, , "Add A to B")
{
  int nargin = args.length ();

  if (nargin != 2)
    print_usage ();
  else
    {
      NDArray A = args(0).array_value ();
      NDArray B = args(1).array_value ();
      if (! error_state)
        return octave_value (A + B);
    }

  return octave_value_list ();
}