NAG Library Manual, Mark 28.4
Interfaces:  FL   CL   CPP   AD 
NAG FL Interface Introduction
Example description

G02ABF Example Program Data
 4 'B' 0.02                  :: N, OPT, ALPHA
   2.0   -1.0    0.0    0.0
  -1.0    2.0   -1.0    0.0
   0.0   -1.0    2.0   -1.0
   0.0    0.0   -1.0    2.0  :: End of G
 100.0   20.0   20.0   20.0  :: W