FLA_Trinv_u_blk_var2.c File Reference

(r)


Functions

FLA_Error FLA_Trinv_u_blk_var2 (FLA_Diag diag, FLA_Obj A, fla_trinv_t *cntl)

Function Documentation

FLA_Error FLA_Trinv_u_blk_var2 ( FLA_Diag  diag,
FLA_Obj  A,
fla_trinv_t cntl 
)

References FLA_Cont_with_3x3_to_2x2(), FLA_Determine_blocksize(), FLA_MINUS_ONE, FLA_Obj_length(), FLA_ONE, FLA_Part_2x2(), FLA_Repart_2x2_to_3x3(), FLA_Trinv_internal(), and FLA_Trsm_internal().

Referenced by FLA_Trinv_u().

00038 {
00039   FLA_Obj ATL,   ATR,      A00, A01, A02, 
00040           ABL,   ABR,      A10, A11, A12,
00041                            A20, A21, A22;
00042 
00043   dim_t b;
00044 
00045   FLA_Part_2x2( A,    &ATL, &ATR,
00046                       &ABL, &ABR,     0, 0, FLA_TL );
00047 
00048   while ( FLA_Obj_length( ATL ) < FLA_Obj_length( A ) ){
00049 
00050     b = FLA_Determine_blocksize( ABR, FLA_BR, FLA_Cntl_blocksize( cntl ) );
00051 
00052     FLA_Repart_2x2_to_3x3( ATL, /**/ ATR,       &A00, /**/ &A01, &A02,
00053                         /* ************* */   /* ******************** */
00054                                                 &A10, /**/ &A11, &A12,
00055                            ABL, /**/ ABR,       &A20, /**/ &A21, &A22,
00056                            b, b, FLA_BR );
00057 
00058     /*------------------------------------------------------------*/
00059 
00060     /* A12 = A12 / triu( A22 ) */
00061     FLA_Trsm_internal( FLA_RIGHT, FLA_UPPER_TRIANGULAR, FLA_NO_TRANSPOSE, diag, 
00062                        FLA_ONE, A22, A12,
00063                        FLA_Cntl_sub_trsm1( cntl ) );
00064 
00065     /* A12 = -triu( A11 ) \ A12 */
00066     FLA_Trsm_internal( FLA_LEFT, FLA_UPPER_TRIANGULAR, FLA_NO_TRANSPOSE, diag, 
00067                        FLA_MINUS_ONE, A11, A12,
00068                        FLA_Cntl_sub_trsm2( cntl ) );
00069 
00070     /* A11 = inv( A11 ) */
00071     FLA_Trinv_internal( FLA_UPPER_TRIANGULAR, diag, A11,
00072                         FLA_Cntl_sub_trinv( cntl ) );
00073 
00074     /*------------------------------------------------------------*/
00075 
00076     FLA_Cont_with_3x3_to_2x2( &ATL, /**/ &ATR,       A00, A01, /**/ A02,
00077                                                      A10, A11, /**/ A12,
00078                             /* ************** */  /* ****************** */
00079                               &ABL, /**/ &ABR,       A20, A21, /**/ A22,
00080                               FLA_TL );
00081 
00082   }
00083 
00084   return FLA_SUCCESS;
00085 }


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