Functions | |
FLA_Error | FLA_Trinv_u_unb_var4 (FLA_Diag diag, FLA_Obj A) |
References FLA_Cont_with_3x3_to_2x2(), FLA_Ger_external(), FLA_Invert(), FLA_MINUS_ONE, FLA_Obj_length(), FLA_Part_2x2(), FLA_Repart_2x2_to_3x3(), FLA_Scal_external(), FLA_Trmv_external(), and FLA_Trsv_external().
00038 { 00039 FLA_Obj ATL, ATR, A00, a01, A02, 00040 ABL, ABR, a10t, alpha11, a12t, 00041 A20, a21, A22; 00042 00043 FLA_Part_2x2( A, &ATL, &ATR, 00044 &ABL, &ABR, 0, 0, FLA_TL ); 00045 00046 while ( FLA_Obj_length( ATL ) < FLA_Obj_length( A ) ){ 00047 00048 FLA_Repart_2x2_to_3x3( ATL, /**/ ATR, &A00, /**/ &a01, &A02, 00049 /* ************* */ /* ************************** */ 00050 &a10t, /**/ &alpha11, &a12t, 00051 ABL, /**/ ABR, &A20, /**/ &a21, &A22, 00052 1, 1, FLA_BR ); 00053 00054 /*------------------------------------------------------------*/ 00055 00056 /* alpha11 = 1.0 / alpha11 */ 00057 if ( diag == FLA_NONUNIT_DIAG ) 00058 FLA_Invert( alpha11 ); 00059 00060 /* a12t = -a12t / triu( A22' ) */ 00061 FLA_Scal_external( FLA_MINUS_ONE, a12t ); 00062 FLA_Trsv_external( FLA_UPPER_TRIANGULAR, FLA_TRANSPOSE, diag, 00063 A22, a12t ); 00064 00065 /* A02 = -a01 * a12t + A02 */ 00066 FLA_Ger_external( FLA_MINUS_ONE, a01, a12t, A02 ); 00067 00068 /* a01 = triu( A00 ) * a01 */ 00069 FLA_Trmv_external( FLA_UPPER_TRIANGULAR, FLA_NO_TRANSPOSE, diag, 00070 A00, a01 ); 00071 00072 /*------------------------------------------------------------*/ 00073 00074 FLA_Cont_with_3x3_to_2x2( &ATL, /**/ &ATR, A00, a01, /**/ A02, 00075 a10t, alpha11, /**/ a12t, 00076 /* ************** */ /* ************************ */ 00077 &ABL, /**/ &ABR, A20, a21, /**/ A22, 00078 FLA_TL ); 00079 00080 } 00081 00082 return FLA_SUCCESS; 00083 }