obtain "gca" and "gcf" from an existing fig file, which was generated by "plotyy"

I plan to modify the exiting fig and therefore, the "gca" and "gcf" information is needed. but get(gca) is only valid for the first layer of the plot. But I also want modify the second layer.

so how can I get information for both layers, i.e., gca1 and gca2?

Thanks

Answer 1

[Walter Roberson]

 FigureNumber = openfig('TheName.fig');
 axes_handles = findobj(FigureNumber, 'type', 'axes');

[Dingguo Lu]

Thanks first!

However, FigureNumber = openfig('TheName.fig'); will move one layer from original place. Is there any way to correct it?

[Walter Roberson]

openfig() will create a figure. Figures are never nested. The created figure will be at exactly the same layer as it was when it was created. The only difference may be in the figure number.

Answer 2

[per isakson]

The doc (R2012a) says:

    [AX,H1,H2] = plotyy(...) returns the handles of the two axes created
    in AX and the handles of the graphics objects from each plot in H1 and
    H2. AX(1) is the left axes and AX(2) is the right axes.

[Dingguo Lu]

The plot has already been generated by "plotyy". I wanna to modify the existing figure.

Thanks all the same.