problem with the legend in my graph

Question

Sam Alex 2012-12-25

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https://ww2.mathworks.cn/matlabcentral/answers/57368-problem-with-the-legend-in-my-graph

Hi,

In the code below, the legend is not representative to the data stream being drawn and with different colors than what I specified. Could anyone plz tell what am I doing wrong?

x1=untitled(:,4);
x2=untitled(:,5);x3=untitled(:,6);
G=linspace(0,9999,length(x1));
G=G';
ii = round(linspace(1,numel(x1),50)) ; ix = round(linspace(1,numel(x2),50));ixx = round(linspace(1,numel(x3),50)) ;
plot(G,x1,'r-',G(ii),x1(ii),'r+');hold on; 
plot(G,x2,'b-',G(ix),x2(ix),'bo');hold on; plot(G,x3,'k-',G(ixx),x3(ixx),'ks');hold on;xlabel('Function Evaluations (FE)');ylabel('log[f(x)-f(x~)]');legend('NCA','N-HCA','IN-HCA');title('Constrained function 1');

Thanks

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Answer 1

Azzi Abdelmalek 2012-12-25

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https://ww2.mathworks.cn/matlabcentral/answers/57368-problem-with-the-legend-in-my-graph#answer_69425

编辑：Azzi Abdelmalek 2012-12-25

在 MATLAB Online 中打开

Because you have six plots, the legend will correspond, in order, to the three first plot

Look how to do it

 close
G=0:0.1:10
x1=sin(t);
x2=cos(t)
x3=sin(0.5*t)
ii=randi(numel(t),5,1)
% first three plot
plot(G,x1,'r-'),hold on
plot(G,x2,'b-')
plot(G,x3,'k-')
%last three plot
plot(G(ii),x1(ii),'r+');
plot(G(ii),x3(ii),'ks');
plot(G(ii),x2(ii),'bo');
xlabel('Function Evaluations (FE)');
ylabel('log[f(x)-f(x~)]');
legend('NCA','N-HCA','IN-HCA');
title('Constrained function 1');

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Azzi Abdelmalek 2012-12-25

Sam, use hold on once, at the end use hold off. If you want your markers to apear in the legend, plot the last three plots then the first ones

Sam Alex 2012-12-25

Azzi..a question, now when I do this it works fine, and the markers show fine, now when I convert to log y scale the markers are not much visible for some of the curves (that have negative values) as they are smaller but I want these markers still to be clear, any ideas?

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