Ok, in Deiner Version von SIP gibt es kein mogrify.

Deshalb habe ich Dir eine neue Version von drwacross ohne mogrify gemacht:

Code:
function pic_out=drawcross(pic,x,y)
//
// draw a cross in a picture
//
//
// v1.1 21.2.2006 stochri
//
//
// Verion History
//
// v1.0 using mogrify
// v1.1 without using mogrify


a=4;
b=30;
rectangle=ones(b,a);

y1=y-b/2;
x1=x-a/2;

//pic_out=pic;
pic(y1:y1+b-1,x1:x1+a-1,1)=rectangle-1;
pic(y1:y1+b-1,x1:x1+a-1,2)=rectangle-1;
pic(y1:y1+b-1,x1:x1+a-1,3)=rectangle;




a=30;
b=4;
rectangle=ones(b,a);

y1=y-b/2;
x1=x-a/2;

pic(y1:y1+b-1,x1:x1+a-1,1)=rectangle-1;
pic(y1:y1+b-1,x1:x1+a-1,2)=rectangle-1;
pic(y1:y1+b-1,x1:x1+a-1,3)=rectangle;

pic_out=pic;

endfunction

//
// -------------------------------------------------------------------------
// This file ist made for scilab the free mathematical toolbox 
//
// Copyright (C) 2005  stochri
//
// This program 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 of the License, or
// (at your option) any later version.
//
// This program 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 this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
// -------------------------------------------------------------------------
//