the legend shows different colors than the figure

Hello everyone,

I have an errorbar plot, but the legend shows the same color and symbol for all items:

figure (18)
title('Mo21, Vo21final - sily a momenty')
hold on; grid on;
errorbar(Mo21uhel,Mo21final.Fx_original(Mo21idx),Fx,'red-o'); 
errorbar(Mo21uhel,Mo21final.Fy_original(Mo21idx),Fy,'green-o'); 
errorbar(Mo21uhel,Mo21final.Mz_original(Mo21idx),Mz,'blue-o'); 
errorbar(Vo21uhel23,Vo21final23.Fx_original(Vo21idx23),Fx,'red--+');
errorbar(Vo21uhel23,Vo21final23.Fy_original(Vo21idx23),Fy,'green--+');
errorbar(Vo21uhel23,Vo21final23.Mz_original(Vo21idx23),Mz,'blue--+');
errorbar(Vo21uhel45,Vo21final45.Fx_original(Vo21idx45),Fx,'red-+');
errorbar(Vo21uhel45,Vo21final45.Fy_original(Vo21idx45),Fy,'green-+');
errorbar(Vo21uhel45,Vo21final45.Mz_original(Vo21idx45),Mz,'blue-+');
xlabel('\alpha'); ylabel('Fx,Fy,Mz'); 
legend('Mo21Fx-orig.','Mo21Fy-orig.','Mo21Mz-orig.', ...
    'Vo21Fx23-orig.','Vo21Fy23-orig.','Vo21Mz23-orig.', ...
    'Vo21Fx45-orig.','Vo21Fy45-orig.','Vo21Mz45-orig.');

The figure:

Please help. Thank you. Petr

[Mathieu NOE]

I don't have your issue with R2025a

tested with dummy data

% dummy data
n = 100;
x = 1:n;
 for k=1:9
     y{k} = 10*k + 0.1*k*x + 3*sin(x/k)+0.1*randn(size(x));
     e{k} = 2*ones(size(x));
 end


figure (18)
title('Mo21, Vo21final - sily a momenty')
hold on; grid on;
errorbar(x,y{1},e{1},'red-o'); 
errorbar(x,y{2},e{2},'green-o');
errorbar(x,y{3},e{3},'blue-o'); 
errorbar(x,y{4},e{4},'red--+');
errorbar(x,y{5},e{5},'green--+')
errorbar(x,y{6},e{6},'blue--+');
errorbar(x,y{7},e{7},'red-+');
errorbar(x,y{8},e{8},'green-+');
errorbar(x,y{9},e{9},'blue-+');

xlabel('\alpha'); ylabel('Fx,Fy,Mz'); 
legend('Mo21Fx-orig.','Mo21Fy-orig.','Mo21Mz-orig.', ...
    'Vo21Fx23-orig.','Vo21Fy23-orig.','Vo21Mz23-orig.', ...
    'Vo21Fx45-orig.','Vo21Fy45-orig.','Vo21Mz45-orig.');

[Petr Michalek]

I think I found the solution similar to yours. My error values are the same for each errorbar plot, so I multiplied them with the vector of ones.

jednicky = ones(1,73);
figure (1)
title('Mo21 hladky - male modely')
hold on; grid on;
errorbar(uhel_sort,Mo21hladky.Fx_original(index_sort),Fxerr*jednicky,'red-+')
errorbar(uhel_sort,Mo21hladky.Fy_original(index_sort),Fyerr*jednicky,'green-+')
errorbar(uhel_sort,Mo21hladky.Mz_original(index_sort),Mzerr*jednicky,'blue-+')
legend('Mo21-Fx','Mo21-Fy','Mo21-Mz')
xlabel('\alpha'); ylabel('Fx,Fy,Mz')

Answer 1

[Star Strider]

It would help to have your data and code.

In all likelihood, this is caused by the first entry:

errorbar(Mo21uhel,Mo21final.Fx_original(Mo21idx),Fx,'red-o');

actually having several separate errorbar objects within it. (That may also be true of the others.)

If so, a fix for it is to add a handle to each of them, for example:

heb{1} = errorbar(Mo21uhel,Mo21final.Fx_original(Mo21idx),Fx,'red-o');

and so for the rest, and then in the legend call, adding references to each one as:

legend([heb{1}(1) heb{2}(1) heb{3}(1) heb{4}(1) heb{5}(1) heb{6}(1) heb{7}(1) heb{8}(1) heb{9}(1)], 'Mo21Fx-orig.','Mo21Fy-orig.','Mo21Mz-orig.', ...

'Vo21Fx23-orig.','Vo21Fy23-orig.','Vo21Mz23-orig.', ...

'Vo21Fx45-orig.','Vo21Fy45-orig.','Vo21Mz45-orig.');

(those might need to be vertically concatenated) to specify the first line object in each errorbar call.

EDIT -- Corrected typographical errors.

[Petr Michalek]

When I change the errorbar plot to line plot, the legend shows fine. Just changed the errorbar command to plot and removed the error value.

plot(Mo21uhel,Mo21final.Fx_original(Mo21idx),'red-o');

etc.

[Star Strider]

Noted.

However that does ntot solve the problem if you want errorbar plots.

.