Find number of zeros in a part of a matrix

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Panouoilis
Panouoilis on 5 Aug 2013
Commented: Jan on 16 Mar 2018
I need to find the number of zeros that are contained in a part of a matrix. For example if the matrix is [1 2 2 2 2 2 0 2 2 2 0 3 0 0 4 5 6 7 0 0 8] is there a fast way to get the number of zeros between the fifth and tenth element? In this case the answer would be 1.
Thank you!

Answers (3)

Evan
Evan on 5 Aug 2013
Edited: Evan on 5 Aug 2013
A = [1 2 2 2 2 2 0 2 2 2 0 3 0 0 4 5 6 7 0 0 8];
numZeros = sum(~A(5:10));

Image Analyst
Image Analyst on 5 Aug 2013
Three ways that I can think of off the top of my head:
data = [1 2 2 2 2 2 0 2 2 2 0 3 0 0 4 5 6 7 0 0 8];
numberOfZeros = length(data) - nnz(data)
numberOfZeros = sum(data==0)
numberOfZeros = nnz(~data)
  1 Comment
Image Analyst
Image Analyst on 5 Aug 2013
Note: this does the whole array because I think it's a dangerous assumption to look just between the 5th and 10th elements, which works well for your example but not in general.

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Sarumathi C
Sarumathi C on 15 Mar 2018
Edited: Image Analyst on 15 Mar 2018
How do I find the zeros locations in a array by using "for loop" and store in the new array matrix?
Example:
[1 2 3 0;
4 5 6 0;
7 8 0 9.....]
I need the output like
[ 4
4
3]
It's a zeros Location
If zeros location is same,we should find the difference between the two rows...
Like,
In the above Matrix we have a 4. & 4 there is zeros locations are same so we should find out the difference between that two rows like
4-1=3;
5-2=3....
So the output like
[3 3 3
7 8 0 9....]
  2 Comments
Jan
Jan on 16 Mar 2018
@Sarumathi C: Please open a new thread for a new question. This is better than hijacking an existing thread by attaching a new question in the section for answers. Thanks.

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