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Can I count the number of integers in an index and store it in a variable?

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Shawn Blancett
Shawn Blancett 2017-9-16
评论： Stephen23 2017-9-17
index = find([X] == 1)
If I have an array X and I use index to find the where the value 1 is in the array and it gives me the following output that there are 2 places where the number 1 is found at spot [3;25]
index =
3
25
Can I store the value 2 in a variable that it found 2 integers?
  1 个评论
Stephen23
Stephen23 2017-9-17
The find is not required (logical indexing is often much more efficient than using find) The square brackets are also not needed.
nnz(X==1)

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Star Strider
Star Strider 2017-9-16
Yes.
Xeq1 = numel(index);
This is how I would do it.

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