Replace zeros with NaN's - when there are already NaN's in the matrix?

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scour_man
scour_man 2011-6-9
Hi
I have a large square matrix which is made up of smaller square matrices which have some NaN values. I used 'blkdiag' to combine the matrices diagonally and all the gaps were filled in with zeros.
I now wish to replace all of the zeros in the large matrix (F) with NaN's.
I tried F(find(~F))=NaN but I get an error saying NaN's cannot be converted to logicals, which makes sense but now I'm not sure how I can get round it. I am fairly new to Matlab.
Any help would be much appreciated.

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采纳的回答

Sean de Wolski
Sean de Wolski 2011-6-9
No reason for find and you can't convert nans to logicals.
F(F==0) = nan;
  1 个评论
scour_man
scour_man 2011-6-9
Great, thanks. Seems obvious now! And yes its to stop zero values showing up in surf and contour plots in between areas of data. Thank you

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更多回答（2 个）

Ivan van der Kroon
Change to double first:
F=double(F);
F(find(~F))=NaN;
Just curious; why would you need this?
Andrei Bobrov
Andrei Bobrov 2011-6-9
F(~isnan(F))=NaN;

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