Adding legend to Matlab figure...

[IceMan30]

Really simple question...

What's the trick to adding a legend to a matlab plot? I'm a pretty experienced Matlab user, just shaking the rust off after a couple years of little use. To cite the example in a Matlab manual (version 7, from early 2009 I think):

>> x = 0i/200:2*pi;
>> y = sin(x);
>> y2 = sin(x-.25);
>> y3 = sin(x-.5);
>> plot(x,y,x,y2,x,y3)
>> legend('sin(x)','sin(x-.25)','sin(x-.50)')


When I plot this, the figure comes up fine, but I get the following errors in regards to the legend:

************************************************
??? Error using ==> hgconvertunits
Invalid object handle.

Error in ==> legend>make_legend at 386
lh=scribe.legend(ha,orient,location,position,children,listen,strings,propargs{:});

Error in ==> legend at 285
[h,msg] = make_legend(ha,varargin(arg:end));

*************************************************

I've yet to step through the "legend" code, but really, for a simple figure legend, this seems a bit ridiculous.

Any thoughts? What the crap am I doing wrong??


Thanks in advance!

 

[IceMan30]

..Apparently I had some sort of Windoze memory error. Upon accidentally closing Matlab and restarting, "legend" seems to work fine.

 

[GregLocock]

The gotcha with legends is that you have to have the same number of legend entries as curves, but I can't remember if that causes a fatal crash.

Cheers

Greg Locock


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