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

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.

Answer 1

[Dyuman Joshi]

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

Answer 2

[Walter Roberson]

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