How to plot convolution of 2 functions

if i have a y1 function of t , and y2 function of t and i want to plot convolution of y1 and y2 with time, how to do that it gives me length error

[madhan ravi]

share your code

[Mohamed H]

t=0:0.1:10;
y1=3*t+5;
y2=4*t.^2+1;
output=conv(y1,y2);
plot (t,output)

[vishal raj]

plot(output)

Answer 1

[madhan ravi]

syms t
y1=3*t+5;
y2=4*t^2+1;
fplot(y1*y2)
%edit after Brunos suggestion it’s not possible to represent the convolution for these functions

[Mohamed H]

Yess it worked, Thank youu

[madhan ravi]

Anytime :)

[Bruno Luong]

Careful, the solution provided by ravi is discrete convolution.

Your functions actually doesn't have finite (continuous) convolution, they are not integrable on any standard function space.

You change the t vector (length/step) you'll see the values of the discrete convolution is not stable.

So what is the result? I think it's mostly garbage.

[madhan ravi]

yes completely agree with Bruno , so how can it be plotted?

[Bruno Luong]

It cannot be plotted. The convolution is not defined for those functions.

[madhan ravi]

Thanks Bruno for making it loud and clear.