Functions | |
FLA_Error | FLA_LU_nopiv_unb_var4 (FLA_Obj A) |
References FLA_Cont_with_3x3_to_2x2(), FLA_Dots_external(), FLA_Gemv_external(), FLA_Inv_scal_external(), FLA_MINUS_ONE, FLA_Obj_length(), FLA_Obj_width(), FLA_ONE, FLA_Part_2x2(), and FLA_Repart_2x2_to_3x3().
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 FLA_Obj_width( ATL ) < FLA_Obj_width( A )){ 00048 00049 FLA_Repart_2x2_to_3x3( ATL, /**/ ATR, &A00, /**/ &a01, &A02, 00050 /* ************* */ /* ************************** */ 00051 &a10t, /**/ &alpha11, &a12t, 00052 ABL, /**/ ABR, &A20, /**/ &a21, &A22, 00053 1, 1, FLA_BR ); 00054 00055 /*------------------------------------------------------------*/ 00056 00057 /* alpha11 = alpha11 - a10t * a01 */ 00058 FLA_Dots_external( FLA_MINUS_ONE, a10t, a01, FLA_ONE, alpha11 ); 00059 00060 /* a12t = a12t - a10t * A02 */ 00061 FLA_Gemv_external( FLA_TRANSPOSE, FLA_MINUS_ONE, A02, a10t, FLA_ONE, a12t ); 00062 00063 /* a21 = a21 - A20 * a01 */ 00064 FLA_Gemv_external( FLA_NO_TRANSPOSE, FLA_MINUS_ONE, A20, a01, FLA_ONE, a21 ); 00065 00066 /* a21 = a21 / alpha11 */ 00067 FLA_Inv_scal_external( alpha11, a21 ); 00068 00069 /*------------------------------------------------------------*/ 00070 00071 FLA_Cont_with_3x3_to_2x2( &ATL, /**/ &ATR, A00, a01, /**/ A02, 00072 a10t, alpha11, /**/ a12t, 00073 /* ************** */ /* ************************ */ 00074 &ABL, /**/ &ABR, A20, a21, /**/ A22, 00075 FLA_TL ); 00076 00077 } 00078 00079 return FLA_SUCCESS; 00080 }