Function l = vectorlength(v) returns the length of 3-dimensional vectors. Matrix v has 3 columns which contain the x,y,z coordinates, respectively. Each row represents a 3-dimansional vector. Each row in output column vector l matches with the same row in v. The validity of the input is not checked! (c) 2026 fabien van mook 2026.08.20 release of this file within package "fvm-geometry" under GNU GPLv3+