Construct a marked space-time planar point pattern from a list object
# S3 method for list
mstppp(P, ...)
list object containing $xyt, an (n x 3) matrix corresponding to (x,y,t) values; $tlim, a vector of length 2 givign the observation time window, $window giving an owin spatial observation winow, see ?owin for more details, and $data, a data frame containing the collection of marks
additional arguments
an object of class mstppp