How to fix my my convolution function?

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Andrew
Andrew 2014-3-19
评论： Image Analyst 2014-3-19
Hi, my teacher wants us to make a convolution function instead of using matlabs and this is what i have
x=[1 2 3 4] y=[1 2 3 4]
function P = MyConv1(x,y)
p = length(x); q = length(y);
for n = 1:p+q-1
for k = 1:n
P(n) = [sum(x(k)*y(n-k))];
end
end
however i get this error:
Attempted to access y(0); index must be a positive integer or logical.
Error in MyConv1 (line 11) P(n) = [sum(x(k)*y(n-k))];
someone please help me figure out what the issue is

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回答（1 个）

Image Analyst
Image Analyst 2014-3-19
Then add 1. n-k is 0 and MATLAB doesn't allow a zero index. Try n-k+1.
  2 个评论
Andrew
Andrew 2014-3-19
that did not work. And the formula for convolution states n-k so that is why I kept that.
this is the error with that
Attempted to access y(5); index out of bounds because numel(y)=4.
Error in MyConv1 (line 11) P(n) = [sum(x(k)*y(n-k+1))];
Image Analyst
Image Analyst 2014-3-19
Just write the arrays down on paper. Slide them across and see what gets multiplied. It's not that hard to see what to do if you do that. If you really can't figure it out, come back.

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