How to eliminate Repeated NaNs in a array?

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Pappu Murthy
Pappu Murthy on 28 Oct 2019
Commented: Adam Danz on 28 Oct 2019
I have two vectors X, and Y; both will have NaNs present in them.
If X has a NaN, Y will have a NaN as well at the same location.
I would like to squeeze repepated NaNs to just one NaN.
For e.g. if X = [1,2.3, NaN, NaN, NaN, 2, 1].. then
X should be replaced by X=[1,2,3,NaN,2,1] and
Y also should reflect the same.
How would I achieve it?

Accepted Answer

Adam Danz
Adam Danz on 28 Oct 2019
% Demo data
x = [1:5 nan nan nan nan nan nan, 7:10, nan, 12, nan, 13:15, nan nan nan 19 ];
keepIdx = ~isnan(x); % keep all non-nans
keepIdx(logical([1,diff(~keepIdx)])) = true; % keep first of consecutive nans
x = x(keepIdx); % remove unwanted values from x
y = y(keepIdx); % remove unwanted values from y
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