trouble with using isnan function

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

[the cyclist]

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]

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.

Answer 1

[Richard Silberstein]

Thank you James and 'the cyclist',

I did appreciate your prompt input and suggestions.

I did find the source of my confusion, I mistook a processed array for an input array.

The processed array comprised NaN while the input array that caused the problem comprised complex zeros.

Thanks again,

Richard