Convolution does not give desired result

I have data set y1 and x1 which i want to convolve together. (The two images on the left)

When I use conv() it does not produce the correct result seen by the image on the right.

Please can anyone explain why this is?

Also will the time vector that i plot the convolution result with change?

Many Thanks.

Answer 1

[Abhishek Ballaney]

http://www.mathworks.in/help/matlab/ref/conv2.html

[Edward Jones]

I have looked at this and still not getting the desired result