def nonlinear_function_string_changed(self,event):
        self.gradient_table.set_scaling_function(self.nonlinear_function_string.get())
        self.on_gradient_table_changed(final_update = True)
Invoked when Return is pressed in the nonlinear-function edit
dataset/ETHPy150Open enthought/mayavi/tvtk/util/tk_gradient_editor.py/GradientEditor.nonlinear_function_string_changed