Replace NaN with specific value.

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Mehul Agrawal 2016-6-27

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评论： Steven Lord 2016-6-27

I have many large column matrices (each is ~20k x 1). Some elements of the matrices are NaN. I want to replace them with 0 (or some number). Is there a quick way for that. Looping through each element is a very inefficient process and delays my program. The help is really appreciated.

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Answer 1

Guillaume 2016-6-27

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编辑：Guillaume 2016-6-27

在 MATLAB Online 中打开

yourmatrix(isnan(yourmatrix)) = somevalue;

But, using NaN to mark exceptional values is much better than using 0 or some other special value.

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Mehul Agrawal 2016-6-27

Thanks a lot. I actually wanted to do some additions of these matrices and having NaN ignores all other calculations and I will end up having NaN. For my purpose 0 is actually a unique value too (just eligible for calculations).

Steven Lord 2016-6-27

For a couple releases now the sum function has accepted a flag that lets you specify whether NaN values should be included in the sum (which makes the sum NaN) or excluded (unless all the values being summed are NaN.)

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