nan problem

x
x
2011 10 8
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any ways to remove NAN in the final results

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Walter Roberson
Walter Roberson 2011-10-9
Duplicate is at http://www.mathworks.com/matlabcentral/answers/16221-nan-value

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回答（1 个）

Jan
Jan 2011-10-8

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A very vague question. I guess the answer is: yes.
x = [1, NaN, 3];
x(isnan(x)) = [];

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x
x 2011-10-8
when this is done then ahat will be the response sir?nan values wont be displayed..but this may affect the performance ah
x
x 2011-10-8
what does 1,3 means
Wayne King
Wayne King 2011-10-8
Jan is giving you an example by creating a vector,x, with one NaN. Then he is using isnan() to find the element of x that is a NaN and removing it.
x
x 2011-10-8
FOR A 9 BY 9 MATRIX I AM GETTING NAN value..i am getting complex term as 9by9 matrix so i used normalization but for few patches i come across 0/0 so the NAN returns..what can i do for this sir
Jan
Jan 2011-10-8
@x: An explicite example would be much easier to understand.
If your results contain some 0/0==NaN values, it is your turn to define what should happen in this case. It is impossible for us to guess, what a good replacement could be, because this depends on your problem.
Perhaps: x(isnan(x)) = 0, or x(isnan(x)) = -1000, or whatever.
If you plot the results NaN's are often treated very handy, because they are not drawn. See:
plot([1:10, NaN, 11:16]);
Andrei Bobrov
Andrei Bobrov 2011-10-8
Hi Jan!
x = x(~isnan(x))

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