pvm, pv, r, s
[SOFA] Returns the modulus of pv-vector
pv, which must
have 2 elements in its first dimension and 3 in its second dimension.
r is returned the modulus of the position component,
s the modulus of the velocity component. The
output parameters get the same dimensions as
that the first two dimensions (equal to 2 and 3) are omitted.