MATLAB: How to get a surface handle

gcfhandlesurface

Hello together,

in the Matlab Help for surf it Shows the command

h = surf(…) which returns a handle to a chart surface graphics object.

I'm not quite sure, what h is. Whats the difference to the handle I get, calling gcf?

My question is: How can I get the same handle like h just after I plotted the surface.

So i want to plot the surface with

surf(…) (without using h = surf(….))

and then later get the handle created with h.

Is this possible?

Thank you for your help

Best Answer

gcf returns the handle of the active figure. The figure is the entire window, including all menus, all buttons, all graphs, and so on. The handle returned by surf() is the handle just for the one surface.

If you do not record the handle at the time the surface is created, then you can use findobj to look for it:

findobj(gcf, 'type', 'surface')

provided the current figure has not changed.

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MATLAB: Check if figure exists whithout making it appear and using its figure number in findobj()

Since the figure number handles are the integer number, all you really need to do then is use

ishandle(n)

for the desired number.

Or, I'm not seeing the problem...???

MATLAB: Getting the data point from two plotted curves in one figure

h  = findobj(gca, 'Type', 'line');
x1 = get(h(1), 'XData')
y1 = get(h(1), 'YData')
x2 = get(h(2), 'XData')
y2 = get(h(2), 'YData')

But actually your code should work already. If h contains 2 line handles (does it?), then

h = findobj(gca, 'Type', 'line');
x = get(h, 'XData')

replies a {2 x 1} cell. Now x{1} contains the XData of the first line, x{2} of the 2nd line - and the same for the YData. Therefore I cannot reconsider why you state, that you "get the data points of imag(neff)" only. Why do you think that this is the fact?

[EDITED] Ah, this is not one axes object, but two created by plotyy or yyaxis. Then you do not need gca only, but all line objects:

h = findobj(gcf, 'Type', 'line')

You have to search in the current figure, not in the active axes only. Then your code will work.

By the way: Did you use the debugger to check, what your "h = findobj(gca,'Type','line')" replies?

Best Answer

Related Solutions

MATLAB: Check if figure exists whithout making it appear and using its figure number in findobj()

MATLAB: Getting the data point from two plotted curves in one figure

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