how to count values in a matrix

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Leon Phung
Leon Phung 2018-6-7
评论： Leon Phung 2018-6-7
I have a matrix with size 1887x2048, for each element is a number from 0 to 255. I want to find out how many elements is bigger than 100 and how many smaller than 100 (aka volume fraction)

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Walter Roberson
Walter Roberson 2018-6-7
volumefraction = mean2(YourMatrix>100);
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Leon Phung
Leon Phung 2018-6-7
oh wow, I'm trying to write a for loop that switching everything to 0 and 1 to solve this and you just nailed it with a single line, thank you very much.

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