FLA_Trinv_l_unb_var2.c File Reference

(r)


Functions

FLA_Error FLA_Trinv_l_unb_var2 (FLA_Diag diag, FLA_Obj A)

Function Documentation

FLA_Error FLA_Trinv_l_unb_var2 ( FLA_Diag  diag,
FLA_Obj  A 
)

References FLA_Cont_with_3x3_to_2x2(), FLA_Invert(), FLA_MINUS_ONE, FLA_Obj_length(), FLA_Part_2x2(), FLA_Repart_2x2_to_3x3(), FLA_Scal_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     /* a21 = -a21 * alpha11 */
00061     FLA_Scal_external( FLA_MINUS_ONE, a21 );
00062     if ( diag == FLA_NONUNIT_DIAG )
00063       FLA_Scal_external( alpha11, a21 );
00064 
00065     /* a21 = triu( A22 ) \ a21 */
00066     FLA_Trsv_external( FLA_LOWER_TRIANGULAR, FLA_NO_TRANSPOSE, diag, 
00067               A22, 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 }


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