Color and legend for stem() and stairs()

[David Bateman]

Christoph Dalitz wrote:
> Hallo,
>
> eventually I have figured out that the culprit is the stem() function.
> Whenever stem() is called, subsequent calls to legend() no longer work
> properly.
>
> Shall I file a bug report? (If yes: where can bugs be submitted?)
>
> As a workaround, I have noticed that legends given subsequently to
> plot() commands (with the ";...;" argument) actually are not messed up.
>
> So the following works:
>
>     stem(x,y);
>     legend("y(x)");
>     [xs,zs] = stairs(x,z);
>     plot(xs,zs,";z(x);");   # legends drawn with the plot are not messed up
>
> But not:
>
>     stem(x,y);
>     [xs,zs] = stairs(x,z);
>     legend("y(x)","z(x)");  # previous call to stem makes all legends identical
>
>   
Don't bother with the bug report... We're aware of the issue in 3.0.x is 
that the stem plot in fact creates multiple handles rather than a single 
hggroup as Matlab does. Work is underway to fix this in 3.1.51+ and 
though the legend issue is not yet fully addressed the stem plot is now 
an hggroup. For now the workaround in 3.0.x is to do something like

close all; x=y=z=1:10; h1 = stem(x,y); hold on; stairs(x,z); 
legend("y(x)", "", "", "z(x)")

where there are two null legend entries to compensate for the additional 
unused handles..

D.

-- 
David Bateman                                David.Bateman at motorola.com
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