how to calculate number of zeroes in an image array?

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Adnan Saify
Adnan Saify 2016-1-10
评论： Image Analyst 2016-1-10
suppose i have an image array for example
1 2 3 1 2 1 1
0 1 2 5 8 7 9
4 7 8 9 2 3 0
0 0 0 1 2 0 0
the above array has 7 zeroes so how to calculate it using a matlab code

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Image Analyst
Image Analyst 2016-1-10
Here are two ways:
m=[...
1 2 3 1 2 1 1
0 1 2 5 8 7 9
4 7 8 9 2 3 0
0 0 0 1 2 0 0]
numZeros = numel(m) - nnz(m)
numZeros = sum(sum(m==0))
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Adnan Saify
Adnan Saify 2016-1-10
i need one more help ,can we determine number of'0' as well as '1' in an array
Image Analyst
Image Analyst 2016-1-10
I already showed you how to do that - find 0's. For example:
numZeros = sum(sum(m==0))
or in general, to find any integer:
countOfThisNumber = sum(sum(yourArray == yourInteger))
so, to count the 1's, you'd do this:
countOf1s = sum(sum(yourArray == 1))
Of course you can use whatever name for the variables you want. You don't have to use the names I used but I do encourage you to use descriptive names, rather than just single letters, so that your code is maintainable/understandable by others (and you) later, and not just an incomprehensible alphabet soup like we see far too often.

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