# display rectangle on top of plotyy

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Sebastian Roehn el 25 de Mzo. de 2016
Comentada: Mike Garrity el 25 de Mzo. de 2016
Hello community,
I would like to draw a rectangle on top of a plotyy. But the second plot data are always on top of the rectangle. I tried it with uistack, but that isn't working. Here is a small example...
[axh,hLine1,hLine2] = plotyy(1:100,randn(100,1),1:100,randn(100,1));
h = rectangle('Position',[1,0,20,3],'LineWidth',2);
% rectangle on top
uistack(h,'top')
uistack(hLine2,'down')
Greetings Sebastian
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Mike Garrity el 25 de Mzo. de 2016
The first return value from plotyy (axh in your case) is an array of two handles. Try putting the rectangle in the other one. In other words, this:
[axh,hLine1,hLine2] = plotyy(1:100,randn(100,1),1:100,randn(100,1));
rectangle(axh(1),'Position',[1,0,20,3],'LineWidth',2)
is different from this:
[axh,hLine1,hLine2] = plotyy(1:100,randn(100,1),1:100,randn(100,1));
rectangle(axh(2),'Position',[1,0,20,3],'LineWidth',2)
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Sebastian Roehn el 25 de Mzo. de 2016
Hello Mike,
thank you for your answer. But that isn't working, because you cannot specify an axes handle on a rectangle. You get this error:
Error using rectangle
Can't specify convenience arg for this object
Error in plotyy_rectangle (line 2)
h = rectangle(axh(2),'Position',[1,0,20,3],'LineWidth',2);
hfig = figure(1);
[axh,hLine1,hLine2] = plotyy(1:100,randn(100,1),1:100,randn(100,1));
set(hfig,'CurrentAxes',axh(2))
h = rectangle('Position',[1,0,20,3],'LineWidth',2);
Greetings Sebastian
Mike Garrity el 25 de Mzo. de 2016
Sorry, I think that the 1st arg for rectangle was added in R2016a. It's just shorthand for a form that's been around for a long time:
rectangle('Position',[1,0,20,3],'LineWidth',2,'Parent',axh(2))
Most of the graphics objects take that first arg form. We've recently been going through and adding it to the ones which didn't have it.

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