Convolution between an Identity Approximation and a given function

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Hi all,
I try to do a convolution between an Identity Approximation G and a given function S. From a theoretical point of view, we have the property:
But when i'm trying to have the same property in Matlab with the function 'conv':
Sconv = conv(S, g); it doesn't work properly (see figures below).
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Do you have any ideas why is this happening?
Many thanks...
  4 Comments
Image Analyst
Image Analyst on 19 May 2015
Please finish your reply. Give us code to make your figure and demonstrate the problem. Otherwise how can we fix it?
Mac Bekcheva
Mac Bekcheva on 20 May 2015
I know but the code is too long. Anyway, the problem is solved. Thanks for your interest. Best, Mac

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