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a(a==NaN) does not find NaN's in matrix. What to do?

7 次查看（过去 30 天）
Sharon
Sharon 2012-5-29
I have
a=1 NaN 2 6
I want to change the NaN to 0 but
a(a==NaN)=0
does not work and gives me
a =
1.00 NaN 2.00 6.00
What did i do wrong?

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采纳的回答

Sean de Wolski
Sean de Wolski 2012-5-29
NaNs are not equal to themselves!
You could thus do either of these:
* a(isnan(a))=0; %isnan
* a(a~=a) = 0; %nans aren't equal to themselves

更多回答（1 个）

Thomas
Thomas 2012-5-29
Sharon, you are unable to replace the NaN because
NaN ~= NaN (in matlab NaN's are unequal) you can check this by
isequal(NaN,NaN)
ans =
0
to replace NaN's use the isnan function
doc isnan
For your example you need
a(isnan(a))=0
a =
1.00 0 2.00 6.00

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