libflame
revision_anchor
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Functions | |
FLA_Error | FLASH_QR_UT_inc_solve (FLA_Obj A, FLA_Obj TW, FLA_Obj B, FLA_Obj X) |
References FLA_Check_error_level(), FLA_ONE, FLA_QR_UT_inc_solve_check(), FLASH_Apply_Q_UT_inc(), FLASH_Apply_Q_UT_inc_create_workspace(), FLASH_Copy(), FLASH_Obj_create_copy_of(), FLASH_Obj_free(), FLASH_Obj_scalar_width(), FLASH_Part_create_2x1(), FLASH_Part_free_2x1(), and FLASH_Trsm().
{ FLA_Obj W, Y; FLA_Obj AT, AB; FLA_Obj YT, YB; // Check parameters. if ( FLA_Check_error_level() >= FLA_MIN_ERROR_CHECKING ) FLA_QR_UT_inc_solve_check( A, TW, B, X ); FLASH_Apply_Q_UT_inc_create_workspace( TW, B, &W ); FLASH_Obj_create_copy_of( FLA_NO_TRANSPOSE, B, &Y ); FLASH_Apply_Q_UT_inc( FLA_LEFT, FLA_CONJ_TRANSPOSE, FLA_FORWARD, FLA_COLUMNWISE, A, TW, W, Y ); // Create a temporary hierarchical view of only the top n-by-n part of A in // case m > n so that AT captures the upper triangular factor R. We do the // same for Y to ensure conformality. FLASH_Part_create_2x1( A, &AT, &AB, FLASH_Obj_scalar_width( A ), FLA_TOP ); FLASH_Part_create_2x1( Y, &YT, &YB, FLASH_Obj_scalar_width( A ), FLA_TOP ); FLASH_Trsm( FLA_LEFT, FLA_UPPER_TRIANGULAR, FLA_NO_TRANSPOSE, FLA_NONUNIT_DIAG, FLA_ONE, AT, YT ); FLASH_Copy( YT, X ); // Free the temporary hierarchical views. FLASH_Part_free_2x1( &AT, &AB ); FLASH_Part_free_2x1( &YT, &YB ); FLASH_Obj_free( &Y ); FLASH_Obj_free( &W ); return FLA_SUCCESS; }