Length of elements in array that are not NaN

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I am trying to get the length of an array, and exclude NaN values. At the end of the column there are some NaNs. How can I ignore those?
I tried:
But this includes the Nans
When I try:
I get:
Error: Invalid use of operator.

Accepted Answer

Matt J
Matt J on 12 Nov 2018
Edited: Matt J on 12 Nov 2018
num_no_nans = sum( ~isnan(thisS(:,11)) )

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