## Copyright (C) 2009 Lyle Collins
## 
## 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

## uramp

## Author: Lyle Collins
## Created: 2009-08-01

function output = uramp (t,t0)
if (nargin() != 2)
  error("Incorrect input. ustep(vector, scalar).");
  return
endif
vec = isvector(t);
sca = isscalar(t0);
if (vec == 0)
  error("Incorrect input. ustep(vector, scalar).");
  return
endif
if (sca == 0)
  error("Incorrect input. ustep(vector, scalar).");
  return
endif
output = 1:length(t);
for (i=1:length(t))
  if ((t(i)-t0)<0)
    output(i)=0;
    else
      output(i)= t(i);
      endif
endfor
endfunction
