Get matrix coefficients index by index.
Get matrix coefficients index by index. The values array is of length nentries.NOTE: For better efficiency, use HYPRE_SStructMatrixGetBoxValues to get coefficients a box at a time.
NOTE: Users may get values on any process that owns the associated variables.
NOTE: The entries in this routine must all be of the same type: either stencil or non-stencil, but not both. Also, if they are stencil entries, they must all represent couplings to the same variable type (there are no such restrictions for non-stencil entries).
If the matrix is complex, then values consists of pairs of doubles representing the real and imaginary parts of each complex value.