MATLAB: Problem with the legend in the graph

plotting

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

Best Answer

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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