triplet

psi4.core.triplet(A: psi4.core.Matrix, B: psi4.core.Matrix, C: psi4.core.Matrix, transA: bool = False, transB: bool = False, transC: bool = False) → psi4.core.Matrix

Returns the multiplication of three matrices, with options to transpose each beforehand.

Parameters:

• A – First matrix to multiply.

• B – Second matrix to multiply.

• C – Third matrix to multiply.

• transA – Transpose the first matrix before operations?

• transB – Transpose the second matrix before operations?

• transC – Transpose the third matrix before operations?

Returns:

New matrix of ABC.

Return type:

Matrix

Notes

• (AB)C vs. A(BC) selected by cost analysis of overall (not per-irrep) dimensions.

• If A, B, C not of the the same symmetry, always computed as (AB)C.