Perform the Euclidian distance between two nodes.
[D] = NL_F_DistanceNiNj(Ni,Nj,Nx,Ny)
Node.
Node.
Vector x-coordinates.
Vector y-coordinates.
Euclidian distance.
NL_F_DistanceNiNj performs the Euclidian distance between the two nodes
and
. The nodes' coordinates are assumed to be stored inside the vectors
and
.