Description Usage Arguments Value
Construct points matrix.
| 1 | makepointsmatrix(datatable, xvar, yvar, idvar)
 | 
| datatable | a data.table | 
| xvar | column name for x-coordinate | 
| yvar | column name for y-coordinate | 
| idvar | column name for unique key; currently better to use character (gets stored as row.names) | 
a matrix of unique x, y pairs with rownames.
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