Could you possibly help me. I am writing a fairly simple GUI. The callback for “Start” button does the following:

1) Clears the current plot displayed in an Axis object
2) Calculates data for a new plot
3) Plots the new plot in Axes object from 1)

I need 1) to take place instantly, i.e. before 2) because 2) takes lots of time and I don’t want the old plot to be displayed while 2) is running. That’s the sequence I put it in the callback, but in practice the Axes objects get cleared only after 2) is done. Is there any way to refresh the Axes object before the callback is completed?

Thanks in advance,