Why isn't my color assignment working in this bar graph?
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Hi all, I am trying to assign colors to individual bars in a bar plot that I'm making. I was able to do this before using a 3x3 matrix, but now with the 1x3 matrix (called "Slopes" below) I keep getting the error, "??? Index exceeds matrix dimensions. Error in ==> NColdthree at 93 set(bar1(2),'FaceColor','r')" when I try to run the following script:
Slopes = [-0.002 0.010 -0.012];
subplot(1,3,2) bar1 = bar(Slopes);
%Set the colors of the three bars set(bar1(1),'FaceColor','b') set(bar1(2),'FaceColor','r') set(bar1(3),'FaceColor','g')
%Add legend, axis labels, etc. legend(bar1,'P','E','P-E') ylabel 'Regression Coefficients' xlabel('Northern Cold*') title('Linear Trend','FontSize',16) axis([0 4 -0.05 0.05])
Any thoughts on why I can't specify the colors for the 2nd and 3rd bars? Thanks!
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Answers (2)
Image Analyst
on 13 Nov 2013
See attached demo.
4 Comments
Image Analyst
on 14 Nov 2013
It sounds like, from your comment to vivek (who's code is the same as mine just with different variable names), that you got it working. If so, please mark my Answer as Accepted, otherwise let's get it figured out.
Vivek Selvam
on 13 Nov 2013
Edited: Vivek Selvam
on 13 Nov 2013
This link says how to. Hope the following illustration helps.
Slopes = [-0.002 0.010 -0.012];
numBars = numel(Slopes);
x = 1:numBars;
colStr = 'rgbymc';
for i = 1:numBars
barHan = bar(x(i),Slopes(i));
set(barHan,'FaceColor',colStr(i));
hold on
end
In case you have a lot of bars (therefore need more colors), you can make use of colormaps ( doc colormap ). For example using jet colormap (replace the corresponding lines in the above code):
colStr = jet(numBars); % line 4
set(barHan,'FaceColor',colStr(i,:)); % line 7
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