C Library Functions  - chol1d (3)

from * a practical guide to splines * by c. de boor
to be called in
  s m o o t h

constructs the upper three diags. in v(i,j), i=2,,npoint-1, j=1,3, of
 
the matrix
  6*(1-p)*q-transp.*(d**2)*q + p*r, then computes its l*l-transp. decomposition and stores it also in v, then applies
forward and backsubstitution to the right side q-transp.*y in
  qty
to obtain the solution in
  u .

Nemo Release 3.1 chol1d (3) June 29, 2025
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