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how to write a function to return -1 if string is not found in matlab??

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Mohammed
Mohammed 2016-9-5
评论： Image Analyst 2016-9-6
I wrote a function that finds a 3 digit number of a filename? i need to write an if statement to return -1 if this part of the file cannot be extracted ? how do i do that?
Thanks :)
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the cyclist
the cyclist 2016-9-5
There are several possible ways to do this. Can you post your code, or at least the part of it that attempts the extraction?
Image Analyst
Image Analyst 2016-9-6
ANY 3 digit number whatsoever, or only a specific 3 digit number that you specify in the input argument list along with the filename?

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the cyclist
the cyclist 2016-9-5
if isempty(w)
w = -1;
end

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