saving or not matrices

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Nicolas
Nicolas 2011-6-21
Hi,
I'm looking for a way of saving matrices depending on their content.
My loop is generating matrices that I want to save, however sometimes there is no proper values in it (only zeros that i replace by NaN).
I'd like to save only the matrices that have at least one proper value (> 0), but not the ones that have only zeros or NaN.
cheers

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Matt Fig
Matt Fig 2011-6-21
if ~all(isnan(A(:)))
% Do the saving.
end
But it seems to me that if the only source of nans is from when you replace the zeros with nans, then why not just skip this step and decide to save it based on whether the whole array is not equal to zero?
if any(A(:)) % Array with even one non-zero element passes.
% Do the saving.
end
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Nicolas
Nicolas 2011-6-21
oh yeah, that's better.. didn't know "any" though! thanks

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更多回答（1 个）

Nicolas
Nicolas 2011-6-21
Actually I found that way
barycenter(barycenter(:,:)==0)=NaN; %replace zeros with NaN
if isnan(barycenter(1:1))<1
Names = sprintf('%s-%d', FileName, N(n));
xlswrite(Names, barycenter)
end
any advices?
  2 个评论
Matt Fig
Matt Fig 2011-6-21
Your method only checks if the first element is nan or not. It looks like you could learn to benefit from linear indexing. For example,
A(A(:)==0) = nan; % Index all elements at once with (:)
Nicolas
Nicolas 2011-6-21
actually if at least a value appears in my matrix, then it has to be in the first cell, that's why I put ..(1,1). thanks for the tip though

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