| A00 | - the upper-left part of the original matrix A = [A00 A01; A10 A11]
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| A01 | - (optional) the upper-right part of the original matrix A = [A00 A01; A10 A11]
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| A10 | - (optional) the lower-left part of the original matrix A = [A00 A01; A10 A11]
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| A11 | - (optional) the lower-right part of the original matrix A = [A00 A01; A10 A11]
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| ainvtype | - type of approximation for DIAGFORM(A00) used when forming Sp = A11 - A10 inv(DIAGFORM(A00)) A01. See MatSchurComplementAinvType.
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| preuse | - MAT_INITIAL_MATRIX for a new Sp, or MAT_REUSE_MATRIX to reuse an existing Sp, or MAT_IGNORE_MATRIX to put nothing in Sp
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