Computes the centroid of a heatmap and adds this to the heatmap's report.
It is possible to perform multiple iterations and each time with a shrunken heatmap.
Returns an instance of a TechnicalInformation object, containing
detailed information about the technical background of this class,
e.g., paper reference or book this class is based on.
Divides all the heatmap values by the value of the specified numeric field.
If the report field is not available or not numeric, then an error gets attached to the notes.
Standardizes the values of a heatmap to have mean of 1 and stdev 1.
NB: normally, the mean is 0 when standardizing, but heatmaps only allow positive values.
Subtracts the value of the numeric field from all non-zero heatmap values.
Values that fall below zero are automatically set to zero (minimum value for a heatmap).