===GetDiscreteColourMap===

The **GetDiscreteColourMap** function of the [[mplreport]] class returns a lookup array of the possible values of a discrete property and the associated MatPlotLib RGB colours for those values, based on an [[AQLHistResponse]] object.

This is usually used to create heatmaps, status-lines, broken bar-charts or other colour-coded displays of discrete values. If colouring //continuous// values, use [[GetAnalogueColourMap]].

Reports using this function may also want to use [[GetDiscreteLegend]].

==Parameters==

^Parameter^Type^Default^Meaning^
|dta|AQLHistResponse||The AQL query response, usually from [[FetchHistory]].|
|col|str||The name of the column you want to build a colour map for|

==Return==

This function returns a dictionary of values. Each value contains the matching colour array in RGBA format, with the alpha set to '1'.