- the right-hand-side matrix MATDENSE (or sparse -- when using MUMPS)
Output Parameter
X -the result matrix (dense matrix)
Notes
If B is a MATDENSE matrix then one can call MatMatSolve(A,B,B);
otherwise, B and X cannot be the same.
Notes
Most users should usually employ the simplified KSP interface for linear solvers
instead of working directly with matrix algebra routines such as this.
See, e.g., KSPCreate(). However KSP can only solve for one vector (column of X)
at a time.