change only those zeros to NaN if all in row are 0

5 次查看（过去 30 天）
Rahul
Rahul 2012-6-6
I have
a =
1 2 3
0 0 0
2 1 0
4 5 0
0 0 0
2 0 1
I need
b =
1 2 3
NaN NaN NaN
2 1 0
4 5 0
NaN NaN NaN
2 0 1
i.e. only if all elements in row are 0 replace with NaN

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采纳的回答

Thomas
Thomas 2012-6-6
a(any(a,2)==0,:)=NaN;
b=a
  3 个评论
显示 1更早的评论
per isakson
per isakson 2012-6-6
Shouldn't that be *all*:
b( all(b, 2) == 0, :) = NaN
Image Analyst
Image Analyst 2012-6-6
It works because any() looks for non-zeros, so it's only zero if there are no non-zeros, in other words, if they are all zeros. Perhaps my answer (not my comment above) might be more intuitive though - it used all().

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更多回答（1 个）

Image Analyst
Image Analyst 2012-6-6
% Make a copy so we don't change a.
b=a
% Find out which rows are all zeros.
nonZeroRows = all(b == 0, 2)
% Assign all columns of the all-zero rows to nans.
b(nonZeroRows, :) = NaN

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