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create a new array without nan

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Ricky
Ricky on 3 Jun 2013
Hello Everyone,
I have a 2D array of size 672*8 in which I have several rows where in first and second column I have a value and in the other there is a nan value. There are also other rows which have values in all the columns. I want to create two new arrays so that first array only contains those elements which have nan in them and second in which there is no nan element.
For eg
Row 12: 517 2850 NaN NaN NaN NaN NaN NaN
Row 13: 652 2037 169 2243 44 2443 -2 2644

Answers (2)

Daniel Shub
Daniel Shub on 3 Jun 2013
Starting with some dummy data
x = [[randn(10, 2), nan(10, 6)]; [randn(10, 2), randn(10, 6)]];
x = x(randperm(length(x)), :);
The two matrices you want are
a = x(isnan(x(:, 3)), :);
b = x(~isnan(x(:, 3)), :);

Andrei Bobrov
Andrei Bobrov on 3 Jun 2013
A - your array
c = accumarray(any(isnan(A),2) + 1, (1:size(A,1))',[],@(x){x});
out = cellfun(@(x)A(x,:),c,'un',0);

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