FLA_Syr2k_lt_unb_var9.c File Reference

(r)


Functions

FLA_Error FLA_Syr2k_lt_unb_var9 (FLA_Obj alpha, FLA_Obj A, FLA_Obj B, FLA_Obj beta, FLA_Obj C)

Function Documentation

FLA_Error FLA_Syr2k_lt_unb_var9 ( FLA_Obj  alpha,
FLA_Obj  A,
FLA_Obj  B,
FLA_Obj  beta,
FLA_Obj  C 
)

References FLA_Cont_with_3x1_to_2x1(), FLA_Obj_length(), FLA_Part_2x1(), FLA_Repart_2x1_to_3x1(), FLA_Scalr_external(), and FLA_Syr2_external().

00038 {
00039   FLA_Obj AT,              A0,
00040           AB,              a1t,
00041                            A2;
00042 
00043   FLA_Obj BT,              B0,
00044           BB,              b1t,
00045                            B2;
00046 
00047   FLA_Scalr_external( FLA_LOWER_TRIANGULAR, beta, C );
00048 
00049   FLA_Part_2x1( A,    &AT, 
00050                       &AB,            0, FLA_TOP );
00051 
00052   FLA_Part_2x1( B,    &BT, 
00053                       &BB,            0, FLA_TOP );
00054 
00055   while ( FLA_Obj_length( AT ) < FLA_Obj_length( A ) ){
00056 
00057 
00058     FLA_Repart_2x1_to_3x1( AT,                &A0, 
00059                         /* ** */            /* ** */
00060                                               &a1t, 
00061                            AB,                &A2,        1, FLA_BOTTOM );
00062 
00063     FLA_Repart_2x1_to_3x1( BT,                &B0, 
00064                         /* ** */            /* ** */
00065                                               &b1t, 
00066                            BB,                &B2,        1, FLA_BOTTOM );
00067 
00068     /*------------------------------------------------------------*/
00069 
00070     /* C = C + a1t' * b1t + b1t' * a1t */             
00071     FLA_Syr2_external( FLA_LOWER_TRIANGULAR, alpha, a1t, b1t, C );
00072 
00073     /*------------------------------------------------------------*/
00074 
00075     FLA_Cont_with_3x1_to_2x1( &AT,                A0, 
00076                                                   a1t, 
00077                             /* ** */           /* ** */
00078                               &AB,                A2,     FLA_TOP );
00079 
00080     FLA_Cont_with_3x1_to_2x1( &BT,                B0, 
00081                                                   b1t, 
00082                             /* ** */           /* ** */
00083                               &BB,                B2,     FLA_TOP );
00084 
00085   }
00086 
00087   return FLA_SUCCESS;
00088 }


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