is it possible to define only the sigma value in the edge command?
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DGM on 6 Mar 2022
Edited: DGM on 6 Mar 2022
Bear in mind that even if you were able to specify the arguments out of order, edge() will assume a default threshold value. That raises the question: do you want to let edge() automatically select the threshold, or do you want no thresholding to be performed?
If you want to simply let edge() select threshold automatically, call it with an empty vector as a placeholder:
BW = edge(I,method,,sigma)
If on the other hand, you want no thresholding to be performed, then afaik, edge() can't do that through its supported syntaxes.
I don't know of any IPT tools that could conveniently do a canny filter set without the thresholding. Certainly, you could roll something custom with basic IPT tools like imfilter(). That said, there may be some implementations on the File Exchange.
For LoG, fspecial() can create a LoG filter of specified size and sigma. You would then apply it with imfilter().