delete the columns with the last two values equal to NAN

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Qian cao
Qian cao 2015-12-21
编辑： Image Analyst 2015-12-21
Hi all, I have a matrix
a=[1 NaN 1 1; 1 1 1 1; NaN NaN NaN 1;NaN NaN 1 NaN ]
How to do the function that deletes the columns whose last two values are NaN? So the a matrix here is expected to be
b=[1 1; 1 1; NaN 1; 1 NaN ]
after the first and second column are deleted from the matrix.
a =
1 NaN 1 1
1 1 1 1
NaN NaN NaN 1
NaN NaN 1 NaN
b =
1 1
1 1
NaN 1
1 NaN
Thank you very much.

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采纳的回答

Renato Agurto
Renato Agurto 2015-12-21
This should do it:
b = a(:, ~isnan(a(end-1,:)) | ~isnan(a(end,:)));

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