how to count number of zeros in each row and column?

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Firas Al-Kharabsheh
编辑： dpb 2016-4-10
how can count the number of zeros in each row and in each column like this
A = [ 1 1 0 1 0 1
0 0 1 0 1 0
1 1 0 0 0 1
0 0 1 0 1 0]
B = [ 2
4
3
4 ]
C = [ 2 2 2 3 2 2 ]

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回答（1 个）

dpb
dpb 2016-4-9
编辑：dpb 2016-4-10
You're not tryin'...
>> sum(~A,2)
ans =
2
4
3
4
>> sum(A==0)
ans =
2 2 2 3 2 2
>>
NB: The latter if A is something other than [0,1]. Showed two alternatives for variety, there are a number of other, particularly when using the special characteristics of the specific values given.
ADDENDUM Actually, ~A is safe for Matlab irrespective of the values of A as long as exact zero is the criterion (that is, no "approximately equal" small floating point values) as anything nonzero is treated as T. This isn't so in some other languages.
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dpb
dpb 2016-4-10
Wonder if would be worth having optional second arg of DIM for nnz??

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