Obtain logical vector for the position of the values located above and below NaNs

Hi guys,

I have a pretty simple question. I would like to obtain the logical vector indicating the indices of numerical values that lie above and below NaNs. This way, my goal would be to construct a logical vector that gives me the position of a NaN only if it has a numerical value on top and below it.

For example:

 xq = [5 3 nan 2 8 nan 3 3 2 8 nan nan nan 4 nan ]' ;

The output I would like to get is

 idx = [0 0 1 0 0 1 0 0 0 0 0 0 0 0 0 ]' ;

Thanks for your answer in advance,

KMT.

Answer 1

[Ameer Hamza]

Try this

xq = [5 3 nan 2 8 nan 3 3 2 8 nan nan nan 4 nan]';
nanIndex = isnan(xq);
requiredIndex = strfind(nanIndex', [0 1 0])+1; % first argument must be row vector

This will give you numeric index. To get the logical vector, add the following lines to this code

requiredResultLogical = false(size(xq));
requiredResultLogical(requiredIndex) = true;