function mtt_write(t,x,y,nx,ny,first);
###############################################################
## Version control history
###############################################################
## $Id$
## $Log$
## Revision 1.6 2002/05/13 08:52:23 gawthrop
## FIRST parameter of simpar now specifies first printed point -
## simulation still starts at zero
##
## Revision 1.5 2001/03/30 15:13:58 gawthrop
## Rationalised simulation modes to each return mtt_data
##
## Revision 1.4 1999/03/15 23:05:29 peterg
## A complete rewrite - now puts into a Global matrix MTT_data
##
## Revision 1.3 1999/03/15 21:57:00 peterg
## Removed the # symbol
##
###############################################################
global MTT_data
if (t==0.0)
MTT_data=[];
endif
if (t>= first)
MTT_data = [MTT_data; t,y(:)',t,x(:)'];
endif
endfunction