% -*- texinfo -*-
% @deftypefn {Function File} {@var{y} =} zgfmul (@var{a}, @var{b}, @var{c}, @var{d}, @var{x})
% Compute product of @var{zgep} incidence matrix @math{F} with vector @var{x}.
% Used by @command{zgepbal} (in @command{zgscal}) as part of generalized conjugate gradient
% iteration.
% @end deftypefn