This controls the output of the mathematical operators in the Poisson-Boltzmann equation as matrices in Harwell-Boeing matrix format (multigrid only). The syntax is:

   writemat {type} {stem}

where

type

A string that indicates what type of operator to output:

poisson

Write out the Poisson operator -\nabla \cdot \epsilon \nabla.

stem

A string that specifies the path for the