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I could not display all the legends related to the plotted bars

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When i run the simple code below i get the following error:
Warning: Ignoring extra legend entries.
> In legend>set_children_and_strings (line 643)
In legend>make_legend (line 328)
In legend (line 254)
In Data_calculation (line 18)
-------------Code-----------------
x=1:5;
y=[4.65,31.41,3.92,4.23,0.47];
b=bar(x,y,0.5,'stacked')
b =
Bar with properties: BarLayout: 'stacked' BarWidth: 0.5000 FaceColor: [0 0.4470 0.7410] EdgeColor: [0 0 0] BaseValue: 0 XData: [1 2 3 4 5] YData: [4.6500 31.4100 3.9200 4.2300 0.4700] Use GET to show all properties
grid on
ylabel('Output energy of the HRES components (MWh/year)')
set(gca, 'XTickLabel',{'PV','WT','Batt','DG','excess'}) %labeling x-axis
legend('PV','WT','Batt','DG','excess') %<-----------------% this is line 18
Warning: Ignoring extra legend entries.

Accepted Answer

Dyuman Joshi
Dyuman Joshi on 24 Mar 2024
You get a single legend entry because there is only a single graphical object.
If you want a separate legend for each bar, you need to plot them as separate bar objects.
One appoach to obtain that is as follows -
x=1:5;
y=[4.65,31.41,3.92,4.23,0.47];
%Modification
z = diag(y,0)
z = 5x5
4.6500 0 0 0 0 0 31.4100 0 0 0 0 0 3.9200 0 0 0 0 0 4.2300 0 0 0 0 0 0.4700
%Modified call to bar()
b=bar(x,z,0.5,'stacked')
b =
1x5 Bar array: Bar Bar Bar Bar Bar
As you can see, now there are 5 Bar objects created.
grid on
ylabel('Output energy of the HRES components (MWh/year)')
set(gca, 'XTickLabel',{'PV','WT','Batt','DG','excess'}) %labeling x-axis
legend('PV','WT','Batt','DG','excess') %<-----------------% this is line 18

More Answers (1)

Walter Roberson
Walter Roberson on 24 Mar 2024
When y is an array, then one legend entry is created for each column of y
When y is a vector, then one legend entry total is created.
Legend entries are not created for each bar -- that's the role of the XTickLabel
x = 1:5;
y = rand(5,2);
b = bar(x,y,0.5,'stacked');
legend show

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