petsc-master 2015-05-23
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MATIS = "is" - A matrix type to be used for using the Neumann-Neumann type preconditioners, see PCBDDC. This stores the matrices in globally unassembled form. Each processor assembles only its local Neumann problem and the parallel matrix vector product is handled "implicitly".

Operations Provided

MatMult()- . MatMultAdd()
MatMultTranspose()- . MatMultTransposeAdd()
MatZeroEntries()- . MatSetOption()
MatZeroRows()- . MatZeroRowsLocal()
MatSetValues()- . MatSetValuesLocal()
MatScale()- . MatGetDiagonal()
MatSetLocalToGlobalMapping()- Options Database Keys:
-mat_type is -sets the matrix type to "is" during a call to MatSetFromOptions()

Notes: Options prefix for the inner matrix are given by -is_mat_xxx

You must call MatSetLocalToGlobalMapping() before using this matrix type.

You can do matrix preallocation on the local matrix after you obtain it with MatISGetLocalMat()

See Also

PC, MatISGetLocalMat(), MatSetLocalToGlobalMapping(), PCBDDC

Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages