Find NaN elements in a matrix

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NS
NS 2011-10-12
评论： Whitney 2021-11-22
Hi Guys,
How can I find the exact location of NaN elements in a matrix. I work with really large arrays (size 1500*200).
How can I find which row has a NaN value in a column matrix or vice versa.?
Thanks
N

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采纳的回答

Walter Roberson
Walter Roberson 2011-10-12
[row, col] = find(isnan(YourMatrix));
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Ana Paulina García
Ana Paulina García 2020-10-5
for me this actually creates a 1x0 variable named row and another one named col. None of the variables tells me the index :(
Whitney
Whitney 2021-11-22
An empty result means that there are no NaNs in the martix

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更多回答（3 个）

Wayne King
Wayne King 2011-10-12
One way:
X = ones(10,4);
X(3,4) = NaN;
indices = find(isnan(X) == 1);
[I,J] = ind2sub(size(X),indices);
bym
bym 2011-10-12
isnan()
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NS
NS 2011-10-12
This gives me just an array of 0 and 1. I need more precise info :(

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Elizabeth Drybrugh
编辑：Elizabeth Drybrugh 2018-5-3
Do this to get the sum
sum(isnan(x))
For other functions, it depends on what you actually need....

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