how do i combine two bar graphs

I have tried to combine these two graphics in many ways but nothing works for me, just as the creation of the legends gives me an error. I need help for this because neither the combination nor the legends want to serve me, Thank you!

        b1=bar(app.CasosUIAxes,data1.dateRep,data1.cases);
        hold on
        %grafica de barras 2
        b2=bar(app.CasosUIAxes,data2.dateRep,data2.cases);
        
        hold off
        legend(app.CasosUIAxes,[b1 b2],'Bar Chart 1','Bar Chart 2')

[VBBV]

Do you mean bar plots don't appear at all ?

[Diego Monsave]

Only the data of the second graph is shown but not the first. The idea is that the two graphics appear in one.

Answer 1

[VBBV]

   %true
legend(app.CasosUIAxes,[b1 b2],{'Bar Chart 1','Bar Chart 2'})

Use {} for combining bar graph

[Diego Monsave]

b1=bar(app.CasosUIAxes, data1.dateRep, data1.cases, 'r');
hold on 
b2=bar(app.CasosUIAxes, data2.dateRep, data2.cases, 'y');
hold on 
legend(app.CasosUIAxes,pais1, pais2) 

This is my code but it shows me the last bar graph and it is not combined with the first. the legend shows the name of graph one and not the second

Answer 2

[Benjamin Kraus]

I could be misunderstanding your question, but I suspect the problem you are facing is that your bar graphs are perfectly overlapping one another. If you create two bar graphs with the same x-values, they will overlap each other and one could be hidden behind the other. The better approach is to create both bars simulteneously with a single call to the bar command.

Consider these three blocks of code. The second approach is preferred.

Overlapping Bars

x = 1:5;
y1 = 1:5;
y2 = 2:6;
bar(x,y1);
hold on
bar(x,y2); % Second bar ignores first bar and will overlap the first bar

Grouped Bars (Preferred Approach)

x = 1:5;
y1 = 1:5;
y2 = 2:6;
bar(x,[y1;y2]); % Creating both bars at once, they are aware of one another and will not overlap

This approach can be used if the x-data for both bars is different as well, either by padding the x-values and y-values with NaNs, or passing to matrices into the bar command. If you pass two matrices into the bar command, be careful of the orientation of the matrices, or you will get unexpected results.

x1 = 1:5;
x2 = 3:7;
y1 = 1:5;
y2 = 2:6;
bar([x1; x2]',[y1;y2]');

Manually Shifted Bars

x = 1:5;
y1 = 1:5;
y2 = 2:6;
bar(x-0.25,y1,0.5) % Manually shift the bar and make it narrower so the other bar fits.
hold on
bar(x+0.25,y2,0.5) % Manually shift the bar and make it narrower so the other bar fits.