Annotate Dictionary

%CENTROID Macro

Retrieves the centroids of polygons

Variables written out:	X, Y, id variables
Prerequisite:	You must run the %ANNOMAC macro before using any other annotate macros. For more information, see Making the Macros Available.

%CENTROID (input-data-set, output-data-set, list-of-id-variables);

input-data-set: specifies a map data set. The input map data set must be sorted by the ID variables.
output-data-set: contains the id variables and the X and Y variables.
list-of-id-variables: specifies the variables each of which is to be assigned the centroid coordinates of each observation in the input-data-set. There will be one observation for each unique set of ID values. If you specify more than one ID variable, then separate each variable with a space.