trouble with using isnan function

Question

Richard Silberstein 2019-11-5

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https://ww2.mathworks.cn/matlabcentral/answers/489234-trouble-with-using-isnan-function

回答： Richard Silberstein 2019-11-5

Hi,

I have 51 complex arrays temp1(2X390X51). Now I know that all arrays except temp1(:,:,25) comprises valid numerical values.

And all the values in temp1(:,:,25) are described as NaN by matlab. When I use the following in the Command Window: isnan(temp1(2,1,25)) I get the correct Logical 1 ie true) which is correct.

However, when I put the same line: isnan(temp1(2,1,25)) in a loop, the expression yields Logical 0. (ie false, which it is not)

Can anyone tell me what I'm doing wrong?

Thanks

Richard

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the cyclist 2019-11-5

It would be much easier to diagnose the problem if you upload code and/or variables (in a *.mat file), using the paper clip icon.

James Tursa 2019-11-5

编辑：James Tursa 2019-11-5

Likely the temp1 you are using in a loop differs from the temp1 you are using at the command line. I.e., something in your code is making them different before you do the compare.

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