The LU test program generates random nonsymmetric band test matrices with values in the interval [-1,1], calls the ScaLAPACK routines to factor and solve the system, and computes a solve and/or factorization residual error check to verify that each operation has performed correctly.

Specifically, each test matrix is subjected to the following test:

- Compute the Band or Tridiagonal LU factorization using PxDBTRF (PxGBTRF or PxDTTRF)
- Solve the system using PxDBTRS (PxGBTRS or PxDTTRS), and
compute the ratio
*SRESID*

Susan Blackford 2001-08-12