Mercurial > octave
view scripts/general/triu.m @ 1315:611d403c7f3d
[project @ 1995-06-25 19:56:32 by jwe]
author | jwe |
---|---|
date | Sun, 25 Jun 1995 19:56:32 +0000 |
parents | fb8ca633c439 |
children | 84bd88b8acee |
line wrap: on
line source
# Copyright (C) 1993, 1994, 1995 John W. Eaton # # 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 2, 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, write to the Free # Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. function retval = triu (x, k) # usage: triu (x, k) # # Return the upper triangular part of x above the k-th diagonal. If # the second argument is omitted, k = 0 is assumed. # # See also: tril, diag if (nargin > 0) [nr, nc] = size (x); retval = zeros (nr, nc); endif if (nargin == 1) k = 0; elseif (nargin == 2) if ((k > 0 && k > nc) || (k < 0 && k < -nr)) error ("triu: requested diagonal out of range") endif else usage ("triu (x [, k])"); endif for j = max (1, k) : nc nr_limit = min (nr, j-k); retval (1:nr_limit, j) = x (1:nr_limit, j); endfor endfunction