Reference

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x_select_function1d

Arguments:

Description:

Open an interactive window, where the user can defined its own 1D function.

If an image is selected, it is used to display additional information :
The first row defines the values of a background curve displayed on the window (e.g. an histogram).
The 2nd, 3rd and 4th rows define the R,G,B color components displayed beside the X and Y axes.
Argument variable_name specifies the variable that contains the selected function keypoints at any time.
Assigning -1 to it forces the interactive window to close.

Default values:

variable_name=xsf_variable, background_curve_R=220, background_curve_G=background_curve_B=background_curve_T.