!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !> This module contains helper routines for converting an NTPoly matrix !> to data structures used in other programs. MODULE MatrixConversionModule USE DataTypesModule, ONLY : NTREAL USE PSMatrixModule, ONLY : Matrix_ps, ConvertMatrixToReal, CopyMatrix, & & DestructMatrix, MergeMatrixLocalBlocks, SplitMatrixToLocalBlocks USE PSMatrixAlgebraModule, ONLY : PairwiseMultiplyMatrix, ScaleMatrix, & & IncrementMatrix USE SMatrixModule, ONLY : Matrix_lsr, DestructMatrix IMPLICIT NONE PRIVATE !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! PUBLIC :: SnapMatrixToSparsityPattern CONTAINS!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !> Some codes use a fixed sparsity pattern for a matrix instead of filtering !> small values. Using this routine, the matrix is filled to have the same !> pattern as the second matrix argument. Zeros of the sparsity pattern are !> left in, whereas values outside the sparsity are removed. This can !> faciliate conversion between formats. SUBROUTINE SnapMatrixToSparsityPattern(mat, pattern) !> The matrix to modify. TYPE(Matrix_ps), INTENT(INOUT) :: mat !> The matrix which defines the sparsity pattern. TYPE(Matrix_ps), INTENT(IN) :: pattern !! Local Variables TYPE(Matrix_ps) :: filtered TYPE(Matrix_ps) :: pattern_1s TYPE(Matrix_ps) :: pattern_0s TYPE(Matrix_lsr) :: local_mat !! First we need to make sure that the sparsity pattern is all 1s. IF (pattern%is_complex) THEN CALL ConvertMatrixToReal(pattern, pattern_1s) ELSE CALL CopyMatrix(pattern, pattern_1s) END IF CALL MergeMatrixLocalBlocks(pattern_1s, local_mat) local_mat%values = 1.0_NTREAL CALL SplitMatrixToLocalBlocks(pattern_1s, local_mat) !! Then all zeros CALL CopyMatrix(pattern_1s, pattern_0s) CALL ScaleMatrix(pattern_0s, 0.0_NTREAL) !! Here we add in the zero values that were missing from the original !! matrix. The secret here is that if you use a negative threshold, we !! never filter a value. CALL IncrementMatrix(pattern_0s, mat, threshold_in=-1.0_NTREAL) !! Next, we zero out values outside of the sparsity pattern. CALL CopyMatrix(mat, filtered) CALL PairwiseMultiplyMatrix(pattern_1s, filtered, mat) !! Cleanup CALL DestructMatrix(pattern_1s) CALL DestructMatrix(pattern_0s) CALL DestructMatrix(filtered) CALL DestructMatrix(local_mat) END SUBROUTINE SnapMatrixToSparsityPattern !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! END MODULE MatrixConversionModule