Nothing
################################
#### Change between latitude/longitude and Cartesian coordinates
#### Tsagris Michail 1/2014
#### mtsagris@yahoo.gr
################################
euclid.inv <- function(U) {
## U is a 3-column matrix of unit vectors
## the cartesian coordinates
U <- as.matrix(U)
if ( ncol(U) == 1 ) U <- t(U)
u <- cbind( acos(U[, 1]), ( atan(U[, 3]/U[, 2]) + pi * I(U[, 2]<0) ) %% (2 * pi) )
u <- u * 180/pi ## from rads to degrees
colnames(u) <- c("Lat", "Long")
## u is a matrix of two columns
## the first column is the latitude and the second the longitude in degrees
u
}
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