Re: passing variable to 'gset arrow'

[Kai Habel]

David Larom wrote:
> 
> I can't get octave to plot an arrow with variable instead of constant
> input, while it works fine in gnuplot. In gnuplot, I can say:
> 
> plot(sin(x))
> a=5
> set arrow from a,0 to a,1
> replot
> 
> and the arrow appears on the plot just fine.
> HOWEVER,
> if in octave I say:
> 
> b=-10:10;
> plot(b,sin(b))
> hold;
> a=5
> gset arrow from a,0 to a,1
> 
> I get the error message "line 0: undefined variable: a".
> can anyone help? Is there a way to pass a variable to
> "gset arrow"?

Hello David,

try this:
octave:9> b=-10:10;
octave:10> plot(b,sin(b))
octave:11> hold;
octave:12> a=5;
octave:13> eval(sprintf("gset arrow from %d,0 to %d,1",a,a));
octave:14> replot

hope this helps,
Kai

-- 
Kai Habel