how to count number of zeros in each row and column?
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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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Answers (1)
dpb
on 9 Apr 2016
Edited: dpb
on 10 Apr 2016
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.
4 Comments
Walter Roberson
on 10 Apr 2016
function [B, C] = nnz_function(A)
B = sum(~A,2);
C = sum(~A);
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