Barcharts colours based on other vectors

Question

Nikolas Spiliopoulos 2020-6-24

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https://ww2.mathworks.cn/matlabcentral/answers/553894-barcharts-colours-based-on-other-vectors

评论： Nikolas Spiliopoulos 2020-6-25

采纳的回答： Adam Danz

Hi all,

I have 3 vectors a,b,c with 4 numbers in each of them

I create another vector d with all the values of vectors a,b,c Sorted.

then I want to plot a barchart of vector d, BUT I would like to have different colours in the bars based on which vector they belong.

Can you help me with this?

for example:

values belong to vector a=green colour

values belong to vector b=blue colour

values belong to vector c=orang colour

Hope the quesiton is clear

thanks in advance

Nikolas

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Answer 1

Adam Danz 2020-6-24

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https://ww2.mathworks.cn/matlabcentral/answers/553894-barcharts-colours-based-on-other-vectors#answer_456622

在 MATLAB Online 中打开

This has been addressed before within the forum (example1 ,example2).

The basic idea is to store the output handle to the bar objects

bh = bar(____);

Set the FaceColor to flat

bh.FaceColor = 'flat';

Redefine the CDdata which defines the color of each bar

colorData = bh.CData;  % Current color arrangement. 
% Example: change color of bar #2 to red
bh.CData(2,:) = [1 0 0]; 
% Example: define the colors based on the jet colormap
bh.CData = jet(size(bh.CData,1));

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Adam Danz 2020-6-25

在 MATLAB Online 中打开

You just need to index the color values accordingly.

a = [10 20 30];
b = [15 25 50];
c = [5 40 80];
d=[a b c];
ID = [ones(size(a)), ones(size(b))+1, ones(size(c))+2];
[d_sorted, sortIdx] = sort(d);
ID_sorted = ID(sortIdx); 
bh = bar(d_sorted);
colors = jet(max(ID)); % Define a colormap
bh.FaceColor = 'flat';
bh.CData = colors(ID_sorted,:) % set the colors.