Set matrix coefficients index by index.NOTE: Users are required to set values on all processes that own the associated variables. This means that some data will be multiply defined.
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.
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