Special legend for special bar plot

Question

Daniel 2021-3-10

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/769002-special-legend-for-special-bar-plot

评论： Star Strider 2021-3-11

采纳的回答： Star Strider

Cts.jpg

在 MATLAB Online 中打开

Here's the code for my bar plot:

ctgroup = reshape(Ct(2:end),5,[]);
ctgroup = [nan,Ct(1),nan;ctgroup];
figure, b = bar(1:6,ctgroup,'FaceColor','flat','HandleVisibility','off'); hold on, b(2).CData(1,:) = [0 0 0];
b(1).CData(2,:) = [0.4940 0.1840 0.5560]; b(1).CData(3,:) = [0.4940 0.1840 0.5560]; b(1).CData(4,:) = [0.4940 0.1840 0.5560];
b(1).CData(5,:) = [0.4940 0.1840 0.5560]; b(1).CData(6,:) = [0.4940 0.1840 0.5560];
b(2).CData(2,:) = [0 0.4470 0.7410]; b(2).CData(3,:) = [0 0.4470 0.7410]; b(2).CData(4,:) = [0 0.4470 0.7410];
b(2).CData(5,:) = [0 0.4470 0.7410]; b(2).CData(6,:) = [0 0.4470 0.7410];
b(3).CData(2,:) = [0.3010 0.7450 0.9330]; b(3).CData(3,:) = [0.3010 0.7450 0.9330]; b(3).CData(4,:) = [0.3010 0.7450 0.9330];
b(3).CData(5,:) = [0.3010 0.7450 0.9330]; b(3).CData(6,:) = [0.3010 0.7450 0.9330];
cases = {'Baseline','cst Pitch','cst TSR','max RR','min C_t','max C_t'};
set(gca,'xticklabels',cases); ax = gca; ax.XTick = 1:6; 
ylabel('C_t','fontsize',14)

The plot is attached. I want to add a legend to this plot that shows the first four bar colors (that's each color once, or black, purple, dark blue, light blue), and nothing more. How can it be done?

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Answer 1

Star Strider 2021-3-11

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/769002-special-legend-for-special-bar-plot#answer_644532

See if the approach in How to draw bar graph of different colors ? will do what you want.

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Daniel 2021-3-11

在 MATLAB Online 中打开

I've added the necessary data below. It took some doing previously to color the bars the way I wanted. Now that the bars need to be created in a loop to make the legend, the indexing is different and I'm struggling to recreate the colors I had previously as shown in the attached plot or using the code provided above. I tried this:

ctgroup = [NaN, 0.9377, NaN;...
    0.6716, 0.5600, 0.4188;...
    0.6675, 0.5751,  0.4253;...
    0.7358, 0.6248, 0.4590;...
    0.6302, 0.5334, 0.3761;...
    1.1973, 1.2254, 1.4879];
barcols = {[1 1 1], [0 0 0], [1 1 1];... 
    [0.4940 0.1840 0.5560], [0 0.4470 0.7410], [0.3010 0.7450 0.9330];...
    [0.4940 0.1840 0.5560], [0 0.4470 0.7410], [0.3010 0.7450 0.9330];...
    [0.4940 0.1840 0.5560], [0 0.4470 0.7410], [0.3010 0.7450 0.9330];...
    [0.4940 0.1840 0.5560], [0 0.4470 0.7410], [0.3010 0.7450 0.9330];...
    [0.4940 0.1840 0.5560], [0 0.4470 0.7410], [0.3010 0.7450 0.9330]};
figure, hold on
for i = 1:length(ctgroup)
    b{i} = bar(i,ctgroup(i,:),'FaceColor','Flat');
end
for i = 1:length(barcols)
    for j = 1:3
        b{i}(j).CData(i,:) = barcols{i,j};
    end
end
% the legend that I want to show corresponding to black, purple, dark blue,
% and light blue:
legend('Baseline','10% Derate','20% Derate','40% Derate')

After the first i of the second loop, though, I get the error that "CData must be an RGB triplet, a scalar, an M-by-1 vector the same length as X, or an M-by-3 matrix." I didn't have this error before, so I'm not sure why now.

Also, to the original question, I can create a legend now, but only when I accept the default colors, which isn't what I'm hoping for. I want the legend to be one entry for each color I use (not including the white).

Daniel 2021-3-11

编辑：Daniel 2021-3-11

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Got it.

figure, hold on
for i = 1:length(ctgroup)
    b{i} = bar(i,ctgroup(i,:),'FaceColor','flat');
end
b{1}(1).HandleVisibility = 'off';
b{1}(3).HandleVisibility = 'off';
for i = 1:length(b)
    for j = 1:3
        b{i}(j).FaceColor = barcols{i,j};
    end
end
legend('Baseline','10% Derate','20% Derate','40% Derate')