how to calculate convolution

i need help,i want to calculate the convolution of two discrete time signal but an error has occurred

n=-20:20;
delta=(n>=3 & n<=8);
x=delta;
% x denotes x[n]
delta=(n>=4 & n<=15);
h=delta;
% h denotes h[n]
subplot(3,1,1)
stem(n,x,'filled');
xlabel('n');
ylabel('Amplitude');
title('X[n]');
subplot(3,1,2)
stem(n,h,'filled');
xlabel('n');
ylabel('Amplitude');
title('h[n]');
subplot(3,1,3)
c=conv(x,h);
stem(n,c,'filled');
xlabel('n');
ylabel('Amplitude');
title('y[n]');

help me find the error in the coding...

[John D'Errico]

What error did you get?

Did you read the help for the conv function? Why not?

[Zeeshan Ahmed]

Attempt to execute SCRIPT conv as a function: C:\Users\Zeeshan\Documents\conv.m

Error in Untitled2 (line 19) c=conv(x,h);

above one

[Zeeshan Ahmed]

Attempt to execute SCRIPT conv as a function: C:\Users\Zeeshan\Documents\conv.m

Error in Untitled2 (line 19) c=conv(x,h);

above one

Answer 1

[Image Analyst]

conv() requires the inputs to be single or double, not logical.

[Zeeshan Ahmed]

means?

Answer 2

[Vishnu Teja]

Can any one solve this question Compute the convolution y[n] = x[n] * h[n] when 𝑥(𝑛) = 𝑎𝑛u(n),0 < a< 1, ℎ(𝑛) = 𝑏𝑛u(n), 0 < b< 1 Assume that a and b are not equal.

[Image Analyst]

This is not an answer for Zeeshan. Please start your own question and explain why y=conv(x, h) does not work for you. And explain your definition of u.