From octave-sources-request at bevo dot che dot wisc dot edu  Thu Oct  1 20:00:47 1998
Subject: new function: is_complex 
From: Erik de Castro Lopo <erikd at zip dot com dot au>
To: octave-sources at bevo dot che dot wisc dot edu
Date: Fri, 02 Oct 1998 11:03:00 +1000

Hi all,

I found a need for a function to tell me is a vector
or matrix had any complex components. I took the
sources for is_vector our of 

	/usr/local/share/octave/2.0.13/m/general/

and modified it as follows. I'll leave it with John's
copyright as I really don't feel I did enough to warant
putting my name on it. 

I do hwoever think that this is probably useful enough 
to place in the standard distribution.

---------------------------------------------------------
## Copyright (C) 1996 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.

## usage: is_complex (x)
##
## Return 1 if X has one complex component or more. Otherwise, return 0.
##
## See also: size, rows, columns, length, is_scalar, is_matrix, is_vector

## Author: jwe

function retval = is_complex (x)

  if (nargin == 1)
    retval = any (any (imag (x)));
  else
    usage ("is_complex (x)");
  endif

endfunction

---------------------------------------------------------

Cheers,
Erik
-- 
+-------------------------------------------------+
     Erik de Castro Lopo     erikd at zip dot com dot au
+-------------------------------------------------+
UNIX *is* user-friendly, just picky about who it 
chooses for friends!