Find number of files in multiple subfolders with specific extension

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I have multiple sub folders in one main folder. These multiple sub folders contains files with the same extension .pgm. How do I go about finding the total number of files in all the subfolders with that specific extension?
I am trying the following:
x = '*.pgm';
AA = size(dir(x),1)
How do I then go through each subfolders?

Answers (1)

Image Analyst
Image Analyst on 11 Nov 2016
dir() can now look inside subfolders if you use two asterisks . See the help.
monkey_matlab on 11 Nov 2016
I did a:
in the main folder, but I got the response '**.pgm' not found.
I also did a
help dir
but could not get a proper way to get the number of files in all the subfolders.
Image Analyst
Image Analyst on 11 Nov 2016
You didn't use it correctly. Check the help again. See my attached demo for how to use it.

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