Convolution without using conv

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Deniz Bozdogan 2021-2-24

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https://ww2.mathworks.cn/matlabcentral/answers/755209-convolution-without-using-conv

评论： Walter Roberson 2021-2-24

I want to find the convolution between x1 and h1 (and for all the other pairs). Both functions from the screenshots are defined for n=[-25:25], all i need is to find how to calculate their convolutions.

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Answer 1

Walter Roberson 2021-2-24

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https://ww2.mathworks.cn/matlabcentral/answers/755209-convolution-without-using-conv#answer_632324

Get your program working first before you worry about optimization.

write a u function.
write a function for each of your formulas. Each one can have a for loop over its inputs, and if/elseif to calculate the outputs.
Now calculate each over -25:25
then calculate the convolution

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Deniz Bozdogan 2021-2-24

I am at calculating the convolution part but i dont know how. Don't i need convolution to find the output?

Walter Roberson 2021-2-24

See the definition of convolution at https://www.mathworks.com/help/matlab/ref/conv.html#buc311j-4

It shows you the summation you need to use. The only trick is in knowing to clamp the mininum and maximum limits to avoid going out of bounds if you are near an edge.

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