A function meant to be used internally be the
Distance matrix to be used
The function takes a distance matrix and a vector with the group identifications for each sample locality (or equivalent). It is mainly meant to be used internally by the
relational.clustering function to optimize the initial clustering and find the local (which hopefully is also the global) optimal organization, such that each member of a group is more similar to the other members in it's group (on average) than to any other groups.
Arc distance between two points on the Earth's surface in kilometers.
The distance calculated may be up to 0.2% inaccurate, as this function treats the Earth as a sphere with a circumference of 40003 km, rather than an ellipsoid like it actually is.
##distance between 23 degrees N 54 degrees E and 32 degrees S 67 degrees E deg.dist(23,54,-32,67)
Loading required package: sp Loading required package: maps Loading required package: shapefiles Loading required package: foreign Attaching package: 'shapefiles' The following objects are masked from 'package:foreign': read.dbf, write.dbf  3201.619
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