for finding convolution of periodic signals we use circular convolution
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there is a big difference between circular and linear convolution , in linear convolution we convolved one signal with another signal where as in circular convolution the same convolution is done but in circular patteren ,depending upon the samples of the signal
Please check the help files of the matlab circular convolution . Matlab already has a readymade function for it.
There are a lot of convolution functions in matlab, mostly in the signal processing toolbox, so it depends on what you want to do. Matlab has extensive help files available online.
An asymmetric enlargement. A convolution, Fourier transformation, for example.
.000025 circular inches = 25 circular mils