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Functions
FLA_Tridiag_UT_form_Q.c File Reference

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Functions

FLA_Error FLA_Tridiag_UT_form_Q (FLA_Uplo uplo, FLA_Obj A, FLA_Obj T, FLA_Obj Q)
 

Function Documentation

◆ FLA_Tridiag_UT_form_Q()

FLA_Error FLA_Tridiag_UT_form_Q ( FLA_Uplo  uplo,
FLA_Obj  A,
FLA_Obj  T,
FLA_Obj  Q 
)
15{
18 ABL, ABR;
20 QBL, QBR;
21 FLA_Obj TL, TR;
22
25
26 // Adjust T.
27 FLA_Part_1x2( T, &TL, &TR, 1, FLA_RIGHT );
28
29 if ( FLA_Obj_is( A, Q ) == FALSE )
30 {
31 FLA_Part_2x2( Q, &QTL, &QTR,
32 &QBL, &QBR, 1, 1, FLA_TL );
33
37
38 if ( uplo == FLA_LOWER_TRIANGULAR )
39 {
40 FLA_Part_2x2( A, &ATL, &ATR,
41 &ABL, &ABR, 1, 1, FLA_TR );
43 }
44 else // ( uplo == FLA_UPPER_TRIANGULAR )
45 {
47 }
48 }
49 else
50 {
51 // Shift the Householder vectors one row/column towards the diagonal.
53
54 FLA_Part_2x2( A, &ATL, &ATR,
55 &ABL, &ABR, 1, 1, FLA_TL );
56
57 if ( uplo == FLA_LOWER_TRIANGULAR )
58 {
60 }
61 else // ( uplo == FLA_UPPER_TRIANGULAR )
62 {
64 }
65 }
66 return r_val;
67}
FLA_Error FLA_QR_UT_form_Q(FLA_Obj A, FLA_Obj T, FLA_Obj Q)
Definition FLA_QR_UT_form_Q.c:13
FLA_Error FLA_Tridiag_UT_shift_U(FLA_Uplo uplo, FLA_Obj A)
Definition FLA_Tridiag_UT_shift_U.c:13
FLA_Error FLA_Tridiag_UT_form_Q_check(FLA_Uplo uplo, FLA_Obj A, FLA_Obj T, FLA_Obj Q)
Definition FLA_Tridiag_UT_form_Q_check.c:13
FLA_Obj FLA_ZERO
Definition FLA_Init.c:20
FLA_Obj FLA_ONE
Definition FLA_Init.c:18
FLA_Error FLA_Part_2x2(FLA_Obj A, FLA_Obj *A11, FLA_Obj *A12, FLA_Obj *A21, FLA_Obj *A22, dim_t mb, dim_t nb, FLA_Quadrant quadrant)
Definition FLA_View.c:17
FLA_Error FLA_Part_1x2(FLA_Obj A, FLA_Obj *A1, FLA_Obj *A2, dim_t nb, FLA_Side side)
Definition FLA_View.c:110
unsigned int FLA_Check_error_level(void)
Definition FLA_Check.c:18
FLA_Bool FLA_Obj_is(FLA_Obj A, FLA_Obj B)
Definition FLA_Query.c:460
int FLA_Error
Definition FLA_type_defs.h:47
FLA_Error FLA_Set(FLA_Obj alpha, FLA_Obj A)
Definition FLA_Set.c:13
int i
Definition bl1_axmyv2.c:145
Definition FLA_type_defs.h:159

References FLA_Check_error_level(), FLA_Obj_is(), FLA_ONE, FLA_Part_1x2(), FLA_Part_2x2(), FLA_QR_UT_form_Q(), FLA_Set(), FLA_Tridiag_UT_form_Q_check(), FLA_Tridiag_UT_shift_U(), FLA_ZERO, and i.

Referenced by FLA_Hevd_lv_unb_var1(), and FLA_Hevd_lv_unb_var2().