Create aditional legend on bar chart

3 views (last 30 days)
Tiago Dias
Tiago Dias on 4 Jun 2019
Edited: dpb on 4 Jun 2019
Hello,
I got a bar chart, and i want to have the bars with different colors. I would like to know if it possible to show sometype of legend in funciton of colors.
I would like to show up, red saying Reaction, green for pressure and etc.
This way i can only show the first one and not able to show the rest.
X = [10 17 3 25 31 20 11 13 14];
myC = [1 0 0; 0 1 0; 1 0 1; 0 0 1; 0.5 0 0.5; 1 0.5 1; 0.5 0 0; 0 0.5 0; 1 0 0.5];
figure();
fig = bar(X);
fig.FaceColor = 'flat';
% hold on
fig.CData(1,:) = [1 0 0];
fig.CData(2,:) = [0 1 0];
fig.CData(3,:) = [1 0 1];
fig.CData(4,:) = [0 0 1];
fig.CData(5,:) = [0.5 0 0.5];
fig.CData(6,:) = [1 0.5 1];
fig.CData(7,:) = [0.5 0 0];
fig.CData(8,:) = [0 0.5 0];
fig.CData(9,:) = [1 0 0.5];
lgd = legend(fig,{'Reaction';'Pressure';'Load';'Separation';'Tanks';'valves';'XV';'TIC';'Hydrogen'},'location','best');
If not possible, other suggestion is welcome!
Thanks for your time,
Tiago

Accepted Answer

dpb
dpb on 4 Jun 2019
Edited: dpb on 4 Jun 2019
Oh, the infamous bar again! What a difficult implemtation it is to do anything with... :(
Believe it or not, you must do something like the following--
M=diag(X);
figure
hB=bar(M,'stacked');
arrayfun(@(i) set(hB(i),'FaceColor',myC(i,:)),1:numel(hB))
hLg=legend({'Reaction';'Pressure';'Load';'Separation';'Tanks';'valves';'XV';'TIC';'Hydrogen'},'location','best');
to convince bar to put multiple bar objects on a figure without grouping them. This is necessary because while you can set an individual color by bar on a single object, legend can only label one per handle graphics object and all the bars drawn are one object when using a vector; there's no option otherwise.
I always suggest to add your voice to the copious complaints/suggestions I've made in the past and submit enhancement requests/quality of implementation/documentation on the bar function. It's incredibly difficult to work with as is and needs all kinds of these bizarre workarounds to do the most obvious of things...try to put a label on each bar and see how much fun that turns into, too...
ADDENDUM
BTW, you can shorten the arrayfun() option to set multiple properties with a single call to set if you turn the colors array into cell array--
myC=cell2mat(myC,ones(1,size(myC,1)));
set(hB,{'FaceColor'},myC)
  2 Comments
dpb
dpb on 4 Jun 2019
Edited: dpb on 4 Jun 2019
That's essentially same solution by another route to create multiple bar handles on same axes. But, a somewhat different problem than the Question! :)
hBar=bar(M,'stacked');
set(hBar(Pressure),'FaceColor','r')
set(hBar(Reaction),'FaceColor','b')
legend(hBar([Pressure(1) Reaction(1)]),'Pressure','Reaction')

Sign in to comment.

More Answers (0)

Categories

Find more on Printing and Saving in Help Center and File Exchange

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by