LAPACK 3.11.0
LAPACK: Linear Algebra PACKage
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◆ LAPACKE_dtp_trans()

void LAPACKE_dtp_trans ( int  matrix_layout,
char  uplo,
char  diag,
lapack_int  n,
const double *  in,
double *  out 
)

Definition at line 39 of file lapacke_dtp_trans.c.

42{
43 lapack_int i, j, st;
44 lapack_logical colmaj, upper, unit;
45
46 if( in == NULL || out == NULL ) return ;
47
48 colmaj = ( matrix_layout == LAPACK_COL_MAJOR );
49 upper = LAPACKE_lsame( uplo, 'u' );
50 unit = LAPACKE_lsame( diag, 'u' );
51
52 if( ( !colmaj && ( matrix_layout != LAPACK_ROW_MAJOR ) ) ||
53 ( !upper && !LAPACKE_lsame( uplo, 'l' ) ) ||
54 ( !unit && !LAPACKE_lsame( diag, 'n' ) ) ) {
55 /* Just exit if any of input parameters are wrong */
56 return;
57 }
58 if( unit ) {
59 /* If unit, then don't touch diagonal, start from 1st column or row */
60 st = 1;
61 } else {
62 /* If non-unit, then check diagonal also, starting from [0,0] */
63 st = 0;
64 }
65
66 /* Perform conversion:
67 * Since col_major upper and row_major lower are equal,
68 * and col_major lower and row_major upper are equals too -
69 * using one code for equal cases. XOR( colmaj, upper )
70 */
71 if( !( colmaj || upper ) || ( colmaj && upper ) ) {
72 for( j = st; j < n; j++ ) {
73 for( i = 0; i < j+1-st; i++ ) {
74 out[ j-i + (i*(2*n-i+1))/2 ] = in[ ((j+1)*j)/2 + i ];
75 }
76 }
77 } else {
78 for( j = 0; j < n-st; j++ ) {
79 for( i = j+st; i < n; i++ ) {
80 out[ j + ((i+1)*i)/2 ] = in[ (j*(2*n-j+1))/2 + i-j ];
81 }
82 }
83 }
84}
#define lapack_int
Definition: lapack.h:87
#define lapack_logical
Definition: lapack.h:103
#define LAPACK_COL_MAJOR
Definition: lapacke.h:53
#define LAPACK_ROW_MAJOR
Definition: lapacke.h:52
lapack_logical LAPACKE_lsame(char ca, char cb)
Definition: lapacke_lsame.c:35
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