Help with isnan with two matrices of unequal dimensions
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Sayantan Sahu
le 15 Jan 2018
Réponse apportée : Guillaume
le 16 Jan 2018
Hi,
I have two matrices of unequal dimensions. pol1 = 1 x 22648 and pol2 has dimensions of 1 X 22706.
I wanted to plot one against the other and I want to check the cells for which both values exist.
I tried good_use=find(~isnan(pol1) & ~isnan(pol2))
but I get an error ' Matrix dimensions must agree '.
How do I solve this error ?
4 commentaires
Guillaume
le 15 Jan 2018
"I want to find the indices for which both pol1 and pol2 have values"
You still haven't explained what that means when the two vectors have different length. Using shorter vectors, if
pol1 = [1 nan 2 nan]
pol2 = [nan 3 4 nan nan 5]
what result would you expect ?
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Guillaume
le 16 Jan 2018
"yes use shorter vectors"
So in effect, you're telling us to truncate the longer one so that it is the same length as the other? If you do that then your initial expression will work.
%truncate longer vector to the size of the shorter vector:
veclength = min(numel(po1), numel(pol2));
pol1 = pol1(1:veclength);
pol2 = pol2(1:veclength);
%your original search, find not needed
good_use = ~isnan(pol1) & ~isnan(pol2)
%plot
plot(pol1(good_use), pol2(good_use))
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Greg Heath
le 15 Jan 2018
Separate the 2 searches.
Hope this helps
Thank you for formally accepting my answer
Greg
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