Using varargin when passing argument into a function in Matlab?

Question

I have a function called viewcsi(varargin) and I want to pass in three variables at most. The first is a MBSspectrum class I made and then a string and also a number.

viewcsi is a call back, it gets called like this:

...'ButtonDownFcn','viewcsi(''pickvox_cb'', sp_viewcsi)');

sp_viewcsi is the MBSspectrum class I made and is in the workspace. I want to be able to add another argument called counter which is integer of type double.

I want to do something like this:

...'ButtonDownFcn','viewcsi(''pickvox_cb'', sp_viewcsi, counter)');

or

...'ButtonDownFcn', {@viewcsi, 'pickvox_cb', 'sp_viewcsi', counter)');

But when I do the last two thing these do not work since they do not preserve 'sp_viewcsi' as a class but treats it like a string. What can I do to fix this? I have a feeling its something easy but I havent been able to figure it out.

Without seeing more code, or better yet a minimal example, it's hard to say, but this related question might help. — jedwards
– jedwards, Commented Oct 23, 2012 at 20:54
Yes more source code is needed but I was able to figure it out. — Ben Fossen
– Ben Fossen, Commented Oct 23, 2012 at 23:41

Rody Oldenhuis · Accepted Answer · 2012-10-24 06:05:43Z

1

The ButtonDownFcn will only ever pass it two arguments. You can cheat it by saying

...'ButtonDownFcn',@(a,b)viewcsi(a,b, counter));

so that the callback will pass it a and b, while Matlab will hand it the current value of counter.

See also the doc on passing extra parameters.

edited Oct 24, 2012 at 6:05

answered Oct 24, 2012 at 5:56

Rody Oldenhuis

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