How to calculate integral of a square waveform

Hi,

Could you please let us know how to calculate integral of a square waveform using Matlab

Answer 1

[Ameer Hamza]

You can use the square() function to create a square wave with the time period of 2*pi and amplitude between -1 and 1. And then use trapz() to evaluate the integral numerically. For example

t = 0:0.1:10; %%choose the range you want
y = square(t);
trapz(t,y)

[Ashwini Amin]

Hi,

Thank you for your response. I am trying below but i am unable to use this function as it is displaying me a error. Please help

t=0:1e-3:4; S1t=heaviside(t)-heaviside(t-2); S2t=heaviside(t)-2*heaviside(t-1)+heaviside(t-2); S3t=heaviside(t)-2*heaviside(t-2)+heaviside(t-3); S4t=-1*heaviside(t)+heaviside(t-3);

    subplot(411);
     plot(t,S1t);
     title(' S1 ');
      subplot(412);
     plot(t,S2t);
     title(' S2 ');
     subplot(413);
     plot(t,S3t);
     title(' S3 ');
      subplot(414);
     plot(t,S4t);
     title(' S4 ');

 %Energy of the signal1

e1Energy= sum(abs(S1t).^2)*1e-3 e2Energy= sum(abs(S2t).^2)*1e-3 e3Energy= sum(abs(S3t).^2)*1e-3 e4Energy= sum(abs(S4t).^2)*1e-3 figure(2); squareRoote1 = sqrt(e1Energy); %F1(t) solution f1t = S1t/squareRoote1; figure(2); subplot(411); plot(t,f1t);

     %Calculate C12
     %c12input = S2t*f1t;
     c12 = trapz(t,S2t,f1t)

Error : Error using trapz Dimension argument must be a positive integer scalar within indexing range.

[Ashwini Amin]

I am trying to calculate the integration of 2 signals. Please suggest a better option to calculate this from -inf to +inf limits