Affine transform from x to the barycentric coordinates c.
|Type :||ndarray of double, shape (nsimplex, ndim+1, ndim)|
This is defined by:
T c = x - r
At vertex j, c_j = 1 and the other coordinates zero.
For simplex i, transform[i,:ndim,:ndim] contains inverse of the matrix T, and transform[i,ndim,:] contains the vector r.