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Grid point time series of TC distance and direction.
RdistPi(Gridlon, Gridlat, TClon, TClat)
two columns for distance in km and cartesian direction in degrees, counterclockwise from the x axis. //@example RdistPi(142,-14,c(144,145),c(-11,-12))
single Grid point longitude
single Grid point latitude
vector of TC longitudes
vector of TC latitudes