Plot disappears after axes command

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Joakim Magnusson
Joakim Magnusson el 26 de Jul. de 2016
Comentada: Joakim Magnusson el 27 de Jul. de 2016
I have a GUI where i plot two curves in the same figure. later in the program i want to plot a third curve in the same figure. To do so i first choose that figure to plot in with the axes command. When i do so one of the previous curves disappears and i can't understand why. Someone who knows?
  7 comentarios
Adam
Adam el 27 de Jul. de 2016
Are you using R2016a or later? If so the help appears to now say that plotyy is "not recommended", although it doesn't say why. It says you should use 'yyaxis' instead, which is a newer function.
Stephen23
Stephen23 el 27 de Jul. de 2016
Editada: Stephen23 el 27 de Jul. de 2016
Actually the axes documentation does describe one syntax which lets you provide an axes handle and it will make those axes the current axes: " axes(h) makes existing axes h the current axes and brings the figure containing it into focus"
However I would advise against using this in serious code, and instead always explicitly specify the axes in every plot function:
plotyy(axh,...)
Almost all plot functions support this, and it is ultimately much simpler and much more robust. It prevents users' clicking from changing the behavior of your code!

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Joakim Magnusson
Joakim Magnusson el 27 de Jul. de 2016
The command:
set(gcf, 'currentaxes', handles.viewCAM_handles.axes_posVelMA)
did the trick. Now I have trouble with wrong y-axis values but that's another problem.
  2 comentarios
Adam
Adam el 27 de Jul. de 2016
plotyy, in common with all main plotting functions (possibly some older ones in toolboxes are exceptions, I'm not sure), has an overload that takes an explicit axes handle as its first argument.
I would strongly recommend to always use this form rather than trying to set which axes is in focus and then plotting with that as an assumption. Often that works fine, but if, for example, the user is able to click on a UI or bring a different figure into focus while the code is running this can lead to unexpected results.
Joakim Magnusson
Joakim Magnusson el 27 de Jul. de 2016
Nice! I didn't know that, thanks!

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