The GUI EXCHANGE Command

The EXCHANGE command is present in many interface menus and sub-menus, and is the essence to using FIT2D for data analysis. EXCHANGE swaps the data in the current data array with any data in the ``memory'' array. If no data is present in the ``memory'' the current data array is left undefined.

EXCHANGE is the way in which to ``charge'' data in the ``memory'' so that binary image processing operations can be used. See Section 7.4, Page  for a detailed example of dividing one image by another.

EXCHANGE is also very useful for recovering the original data after many operations within the GUI. The output of GUI operation, if any, is always in the current data array, but the original data is often transferred to the ``memory''. so after such an operation, EXCHANGE can be used to recover the original data for further analysis.