Create data in spatio-temporal point format.
as.3dpoints(...)The output is an object of the class stpp.
as.3dpoints tries to return the argument(s) as a spatio-temporal points object.
Any object(s), such as \(x\), \(y\) and \(t\) vectors of the same length, or a list or data frame containing \(x\), \(y\) and \(t\) vectors. Valid options for ... are: a points object: returns it unaltered; a list with \(x\), \(y\) and \(t\) elements of the same length: returns a points object with the \(x\), \(y\) and \(t\) elements as the coordinates of the points; three vectors of equal length: returns a points object with the first vector as the \(x\) coordinates, the second vector as the \(y\)-coordinates and the third vector as the \(t\)-coordinates.
Edith Gabriel <edith.gabriel@inrae.fr>, Peter Diggle, Barry Rowlingson.