signal processing - plot convolution in the time domain with octave -

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this plots result of conv vector of new length , t usless include in plot plot(t, z1) %doesn't work!.

t = [-5:.1:10]; unit = @(t) 1.*(t>=0);  h1 = @(t) (3*t + 2).*exp(-3*t).*unit(t); z1 = conv(unit(t), h1(t));  plot(z1);

i want plot of convolved signal function of time.

you need add shape argument. here's spec:

— function file: conv (a, b) — function file: conv (a, b, shape) convolve 2 vectors , b.

the output convolution vector length equal length (a) + length (b) - 1. when , b coefficient vectors of 2 polynomials, convolution represents coefficient vector of product polynomial.

the optional shape argument may be

shape = "full" return full convolution. (default) shape = "same" return central part of convolution same size a.

so convolve this:

z1 = conv(unit(t), h1(t), "same");

and you'll same time units original.


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