Legend doesn't match plot

Hello, my legend color doesn't match the color of my plot. I need two diffentent colors in my legend. I have already searched the other questions asked, but none of them seem to work for me.

   figure
    hold on
%   P(1) =  plot(x1,a1,'g.',x2,b1,'g.',x3,c1,'g.',x4,d1,'g.','DisplayName','a')
    plot(x1,a1,'g.',x2,b1,'g.',x3,c1,'g.',x4,d1,'g.');
    errH1 = errorbar(mean(x1), mean(a1), error_LG(1,Rauheitskennwert),'g+');
    errH1.LineWidth = 1.2;
    errH2 = errorbar(mean(x2), mean(b1), error_LS(1,Rauheitskennwert),'g+');
    errH2.LineWidth = 1.2;
    errH3 = errorbar(mean(x3), mean(c1), error_LgR(1,Rauheitskennwert),'g+');
    errH3.LineWidth = 1.2;
    errH4 = errorbar(mean(x4), mean(d1), error_RG(1,Rauheitskennwert),'g+');
    errH4.LineWidth = 1.2;
    xlim([0.5 4.5])
    

    plot(x1,a_Filter,'.b',x2,b_Filter,'.b',x3,c_Filter,'.b',x4,d_Filter,'.b');
%      P(2) =  plot(3,a_Filter,'.b',3,b_Filter,'.b',3,c_Filter,'.b',3,d_Filter,'.b','DisplayName','b')
    errH6 = errorbar(mean(x1), mean(a_Filter), std(a_Filter),'b+');
    errH6.LineWidth = 1.2;
    errH7 = errorbar(mean(x2), mean(b_Filter), std(b_Filter),'b+');
    errH7.LineWidth = 1.2;
    errH8 = errorbar(mean(x3), mean(c_Filter), std(c_Filter),'b+');
    errH8.LineWidth = 1.2;
    errH9 = errorbar(mean(x4), mean(d_Filter), std(d_Filter),'b+');
    errH9.LineWidth = 1.2;

% legendNames = ['a','b'];
% legend(P)
legend('a','b')

[Çağlar İŞLEK]

Hi, Please share your output plot, I will look into it.

[LM]

Hey, thanks for your answer. You should be able to view it below my name. It is called 'Screenshot 2021-03-17 105128.png'. But Roy Kadesh's answer has already solved my problem. Thanks a lot for your willing to help me though.

Answer 1

[Roy Kadesh]

You did not explicitly state the handles for the legend, so Matlab uses the first two, which happen to be both green, since your plot call returns 4 objects.

%these are the required edits:
    h_green=plot(x1,a1,'g.',x2,b1,'g.',x3,c1,'g.',x4,d1,'g.');

    h_blue=plot(x1,a_Filter,'.b',x2,b_Filter,'.b',x3,c_Filter,'.b',x4,d_Filter,'.b');

legend([h_green(1) h_blue(1)],{'a','b'})

[LM]

Thanks a lot for your help and explanation. That's exactly what i was doing wrong.