# convolution of two signals

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Yuvashree Mani Urmila on 12 Jun 2014
Answered: Sandeep Maurya on 28 Aug 2017
I have two signals represented by x and y values respectively. I have to find the convolution between the two signals. I am attaching the graph plotted from the two signals. can someone help. Thanks.

José-Luis on 12 Jun 2014
You could use the conv() function. It seems to do exactly what you want.
conv(x,y)
doc conv
José-Luis on 13 Jun 2014
Use conv() two times? I am sorry but I don't understand.

Image Analyst on 13 Jun 2014
x1 = numbers(:, 1); % x1 assumed to be in column 1.
y1 = numbers(:, 2); % y1 assumed to be in column 2.
x2 = numbers(:, 3); % x2 assumed to be in column 3.
y2 = numbers(:, 4); % y2 assumed to be in column 4.
out1 = conv(x1,y1);
out2 = conv(x2,y2);

Shahin Alam on 4 Jan 2017
Edited: Image Analyst on 4 Jan 2017
x=[1,1,1];
y=[1,1,1];
How can I find its convolution ?
Image Analyst on 4 Jan 2017
output = conv(x, y, 'full');
plot(output, 'bo-', 'LineWidth', 2);
grid on;

Sandeep Maurya on 28 Aug 2017
x=input('Enter x: ') h=input('Enter h: ') m=length(x); n=length(h); X=[x,zeros(1,n)]; H=[h,zeros(1,m)]; for i=1:n+m-1 Y(i)=0; for j=1:m if(i-j+1>0) Y(i)=Y(i)+X(j)*H(i-j+1); else end end end Y stem(Y); ylabel('Y[n]'); xlabel('----->n'); title('Convolution of Two Signals without conv function');