rse LU factorization package included in the SuiteSparse library,</span>
     <span 
class="cmr-12">available  from  </span><a 
href="faculty.cse.tamu.edu/davis/suitesparse.html" class="url" ><span 
class="cmtt-12">faculty.cse.tamu.edu/davis/suitesparse.html</span></a><span 
class="cmr-12">;</span>
     <span 
class="cmr-12">it  provides  sequential  factorization  and  triangular  system  solution  for</span>
     <span 
class="cmr-12">double   precision   real   and   complex   data.   We   tested   versi