MATLAB: Missing legend entries on plotyy

legendMATLABmissing entriesplotyy

Hi,
I am attempting to plot data on to a graph with two different y axis. I used the plotyy function. To plot four functions on the same plot I use the hold on command. When I attempt to add a legend to the graph it only has three entries. Example code below:
x=0:0.1:10;
y1=x.^2;
y2=log(x);
y3=2*x.^2;
y4=2*log(x);
[AX,L1,L2]=plotyy(x,y1,x,y2)
set(L1,'Color','b');
set(L2,'Color','g');
hold on
[AX,L3,L4]=plotyy(x,y3,x,y4)
set(L3,'Color','b','marker','x');
set(L4,'Color','g','marker','x');
legend('y1','y2','y3','y4')
hold off
'y4' is left off of the legend box when I run the above code. Any suggested modifications to the above code that would allow the legend box to show all four entries would be much appreciated. Thanks, David

Best Answer

Explicitly tell legend() which lines to draw:
legend([L1 L2 L3 L4],'y1','y2','y3','y4')
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