I'm not sure if this is the most efficient way to do it, but you could make the variables global so that they can be accessed by multiple functions. It would not be ideal if you have variables with identical names in the different functions, but in that case you could probably just give them different names. You could also restructure the function so that you call the function with the variables as arguments in the pushbutton file, like so:
function pushbutton1(var1, var2, var3)
or
function pushbutton1(varargin)
if the number of variables you're calling changes.
