Correlating plot's legend and data.

Hi, I cannot figure out why there's no correlation between the legend and the data's colours in the following code:

   figure
   subplot(2,1,1)
   plot(k,RCS_PO,'k',k,RCS_MOM_soft,'m',k,RCS_MIE_soft,'b','LineWidth',2);
   legend('PO','MoM','Mie');
   xlabel('$$ ka $$','fontsize',14,'Interpreter','latex');
   ylabel('$$ RCS_{2D} [m] $$','fontsize',14,'Interpreter','latex');

The legend's colour bar is black, instead of being black, magenta and blue! Why is that? I realise by now that the problem appears to be with the y matrices, as when they are changed to simple trigonometric functions the output is just fine. But how may these y matrices affect the legend's colours?

[Star Strider]

It works correctly for me in R2016b. It could be a bug in an earlier version.

Contact Support to see if it’s a bug and ask if a fix has been published for it. Include the URL for this thread in your email to them.

[Yuval]

How may I possibly fix this without having to use a different version? I am using 2016a. Is there any way around this which would still yield the desired result?

Answer 1

[Star Strider]

I have R2016a installed on this machine, so I brought it up to test this code as a work-sround. It give the desired result, but then so does your original code in R2016a for me.

The Code:

k = 1:20;                                               % Create Testing Data
RCS_PO = rand(1,20);
RCS_MOM_soft = 1+rand(1,20);
RCS_MIE_soft = 2+rand(1, 20);

figure  
subplot(2,1,1)
sp1{1} = plot(k,RCS_PO,'k','LineWidth',2);
hold on
sp1{2} = plot(k,RCS_MOM_soft,'m','LineWidth',2);
sp1{3} = plot(k,RCS_MIE_soft,'b','LineWidth',2);
hold off
legend([sp1{:}], 'PO','MoM','Mie');
xlabel('$$ ka $$','fontsize',14,'Interpreter','latex');
ylabel('$$ RCS_{2D} [m] $$','fontsize',14,'Interpreter','latex');

I actually can’t reproduce your problem in either R2016a or R2016b.

EDIT —

This just in: ‘the problem appears to be with the y matrices’

Without your actual data to experiment with, we can’t help.