Change bar graph color by sign
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Lutrinae
on 10 Nov 2020
Commented: Lutrinae
on 16 Nov 2020
I have a 502x2 column matrix made up of B = [datenum, data]. There are positive nad negative data values, and I want to make all of the positive values red and all of the negative values blue, similar to the figure midway down this page: https://niwa.co.nz/climate/information-and-resources/southern-annular-mode
My code so far is just:
bar(B(:,1), B(:,2))
Is there a straightforward way to do this?
Thank you!
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Accepted Answer
Karthik Ravishankar
on 10 Nov 2020
bar(B(B(:,2)>=0,1), B(B(:,2)>=0,2),'FaceColor','b')
hold on
bar(B(B(:,2)<0,1), B(B(:,2)<0,2),'FaceColor','r')
More Answers (1)
David Hill
on 10 Nov 2020
x=B(:,1)';
y=B(:,1)';
b=bar(x,y,'r');
b.FaceColor='Flat';
b.CData(y<0,:)=repmat([0 0 1],nnz(y<0),1);
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