uramp.m

很多matlab的源代码

function y=uramp(t)
% URAMP  Unit Ramp Function.
%
%        Y=URAMP(t) implements the ramp function r(t) = t*u(t)
%
%        URAMP (with no input arguments) invokes the following example:
%
%          % Plot a triangle between -1 and 1 with height 2
%          >>t=-3:.05:3;
%          >>yt=2*[uramp(t+1)-2*uramp(t)+uramp(t-1)]; 
%          >>plot(t,yt),grid
%
%        See Also: UDELTA, URECT, USTEP, TRI


% ADSP Toolbox: Version 2.0 
% For use with "Analog and Digital Signal Processing", 2nd Ed.
% Published by PWS Publishing Co.
%
% Ashok Ambardar, EE Dept. MTU, Houghton, MI 49931, USA
% http://www.ee.mtu/faculty/akambard.html
% e-mail: [e-mail]
% Copyright (c) 1998


if nargin==0,
 help uramp
 disp('Strike a key to see results of the example')
 pause
 t0=-3:.05:3;
 yt=2*[uramp(t0+1)-2*uramp(t0)+uramp(t0-1)];
  v=matverch;
 if v < 4, eval('clg');else,eval('clf');end

 plot(t0,yt)
 grid 
 return
end

if nargin == 1,
 y=t.*(t>=0);
elseif nargin > 1,
 error('Too many input arguments');
end