Save Matrix values when values change from NaN to a Number in MATLAB

I have a 3x15000 matrix and I want to save the segments during a change from NaN to a number. So I have large sections that all 3 rows are NaN and when it changes I want to generate a new matrix. Is it best to index the start and end point? How do I set a flag in order to step through all the data?

Answer 1

[Iain]

if you ONLY get nans in entire columns, this'll work:

 numbers = oldmatrix(~isnan(oldmatrix));
 numbers = reshape(numbers, 3, []);