how to create trapezoidal wave form as shown in fig in attached file?
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i am using trapezoid function to create a trapezoidal wave form but i am not getting desired result.please help code is here;
function s = trapezoid(t)
%TREPEZOID Trapezoid wave generation.
% TRAPEZOID(T) generates a square wave with period 2*Pi for the
% elements of time vector T. TRAPEZOID(T) is like SQUARE(T), only
% it creates a square wave with peaks of +1 to -1 instead of
% a sine wave.
%
% For example, generate a 30 Hz square wave:
% t = 0:.0001:.0625;
% y = square(2*pi*30*t);, plot(t,y)
%
% I pretty much stole this from square, so see that.
% See also SQUARE
% Author(s): Jordan Firth, 2 Sep 2010
% $Revision: 0.0 $ $Date: 2007/12/14 15:06:21 $
% compute values of t normalized to (pi/4,9*pi/4)
tmp = mod(t-pi/4,2*pi);
tmp = mod(t+pi/4,2*pi);
a = (tmp < pi/2);
b = (tmp >= pi/2 & tmp < pi);
c = (tmp >= pi & tmp < 3*pi/2);
rise = 2*tmp/pi;
fall = -2*(tmp-pi)/pi+1;
nodd = a.*rise + b + c.*fall;
s = 2*nodd-1;
and using this function i am trying to create waveform as i need.
%trapezoid wave form
t = -5:.001:5;
y1 = trapezoid((2*pi*0.5*t)-pi/2);
y2=trapezoid((2*pi*0.5*t)+0);
y3=trapezoid((2*pi*0.5*t)+pi/2);
plot(t,y1,t,y2,t,y3)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/166257/image.png)
%
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