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using hold on with plotyy

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Rory
Rory 2011-9-23
I couldn't find an answer out there, so i'll ask:
I want to plot into one axis many curves (by using a loop), using hold on. How do I use 'hold on' separately for each axis of plotyy?
Then, after this loop, I want to plot a set of points into the second y axis. The set of points does not exist until the loop is done. how do I use plotyy without initially plotting into both axes? can i plot into the second axes afterwards like this?
thanks in advance

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采纳的回答

the cyclist
the cyclist 2011-9-23
plotyy() creates two axes on top of each other. The syntax
>> [ax h1 h2] = plotyy(x1,y1,x2,y2);
will put the handles to both axes in the variable "ax". Then you can use the syntax
>> hold(ax(1),...)
or
>> hold(ax(2),...)
to apply the hold to ones set of axes or the other.

更多回答（1 个）

Rory
Rory 2011-9-26
I also found the clear axes command 'cla' to be useful for this: I set up plotyy with two arbitrary X's an Y's, then go in and clear each axis:
[ax h1 h2]=plotyy([0,1],[0,1],[0,1],[0,1]); axes(ax(1)) cla axes(ax(2)) cla
axes(ax(1)); %make axis 1 the current axis hold(ax(1); now populate the first axis
axes(ax(2)); %make axis 2 the current axis hold(ax(2)); and finally populate the second axis.

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