NAG Library Manual, Mark 30.2
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NAG CL Interface Introduction
Example description

nag_stat_inv_cdf_gamma_vector (g01tfc) Example Program Results

        tail         p          a         b        g     ivalid
 ---------------------------------------------------------------
   Nag_LowerTail   0.010      1.00     20.00     0.201      0
   Nag_LowerTail   0.428      7.50      0.10     0.670      0
   Nag_LowerTail   0.869     45.00     10.00   525.839      0