Re: plotyy broken in 3.6.1?

[marco atzeri]

On 5/20/2012 1:54 AM, notMyUsername wrote:
> Greetings,
>
> I am having an issue when using 'plotyy()' in a subplot.  When I plot
> something in a subplot of a figure and then attempt to plotyy() into another
> subplot of that figure the correct y-axes are displayed, but only one of the
> two curves is displayed.  I can sometimes see the other curve flash in the
> subplot I am plotyy()-ing to but it immediately disappears when the second
> curve is displayed.  The following test code seems to reproduce the issue
> for me:
>
>     clear
>     figure(1)
>     clf
>
>     t=[0:1/1000:1];
>     x=sin(2*pi*t);
>     y=5*cos(2*pi*t);
>
>     figure(1);
>     subplot(3,1,1);
>     hold on
>     title('x(t)')
>     plot(t,x);
>
>     subplot(3,1,2)
>     hold on
>     title('y(y)')
>     plot(t,y);
>
>     subplot(3,1,3)
>     hold on
>     title('x(t), y(y)')
>     plotyy(t,x,t,y);
>
> Here is what I see when I run this:
> http://octave.1599824.n4.nabble.com/file/n4629948/Screen_shot_2012-05-19_at_7.41.57_PM.png
>
> What I expect to see is both x(t) and y(t) plotted together in
> subplot(3,1,3), each with its own y-axis.
>
> If I don't use subplots plotyy() seems to work OK.
>
> Am I doing something wrong or is plotyy() broken in 3.6.1?
>
> Octave 3.6.1 from Homebrew
> OS X 10.6.8

it seems broken, the second curve cover the first one.
Please open a bug report

http://www.gnu.org/software/octave/bugs.html

I notice that without hold the curves are correctly plotted

clear
   figure(1)
   clf

   t=[0:1/1000:1];
   x=sin(2*pi*t);
   y=5*cos(2*pi*t);

   figure(1);
   subplot(3,1,1);
   title('x(t)')
   plot(t,x);

   subplot(3,1,2)
   title('y(y)')
   plot(t,y);

   subplot(3,1,3)
   title('x(t), y(y)')
   plotyy(t,x,t,y);