lapacke_ztb_trans.c
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00001 /*****************************************************************************
00002   Copyright (c) 2010, Intel Corp.
00003   All rights reserved.
00004 
00005   Redistribution and use in source and binary forms, with or without
00006   modification, are permitted provided that the following conditions are met:
00007 
00008     * Redistributions of source code must retain the above copyright notice,
00009       this list of conditions and the following disclaimer.
00010     * Redistributions in binary form must reproduce the above copyright
00011       notice, this list of conditions and the following disclaimer in the
00012       documentation and/or other materials provided with the distribution.
00013     * Neither the name of Intel Corporation nor the names of its contributors
00014       may be used to endorse or promote products derived from this software
00015       without specific prior written permission.
00016 
00017   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
00018   AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00019   IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
00020   ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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00028 ******************************************************************************
00029 * Contents: Native C interface to LAPACK utility function
00030 * Author: Intel Corporation
00031 * Created in February, 2010
00032 *****************************************************************************/
00033 
00034 #include "lapacke_utils.h"
00035 
00036 /* Converts input triangular banded matrix from row-major(C) to
00037  * column-major(Fortran) layout or vice versa.
00038  */
00039 
00040 void LAPACKE_ztb_trans( int matrix_order, char uplo, char diag,
00041                         lapack_int n, lapack_int kd,
00042                         const lapack_complex_double *in, lapack_int ldin,
00043                         lapack_complex_double *out, lapack_int ldout )
00044 {
00045     lapack_logical colmaj, upper, unit;
00046 
00047     if( in == NULL || out == NULL ) return;
00048 
00049     colmaj = ( matrix_order == LAPACK_COL_MAJOR );
00050     upper  = LAPACKE_lsame( uplo, 'u' );
00051     unit   = LAPACKE_lsame( diag, 'u' );
00052 
00053     if( ( !colmaj && ( matrix_order != LAPACK_ROW_MAJOR ) ) ||
00054         ( !upper  && !LAPACKE_lsame( uplo, 'l' ) ) ||
00055         ( !unit   && !LAPACKE_lsame( diag, 'n' ) ) ) {
00056         /* Just exit if any of input parameters are wrong */
00057         return;
00058     }
00059 
00060     if( unit ) {
00061         /* Unit case, diagonal excluded from transposition */
00062         if( colmaj ) {
00063             if( upper ) {
00064                 LAPACKE_zgb_trans( matrix_order, n-1, n-1, 0, kd-1,
00065                                    &in[ldin], ldin, &out[1], ldout );
00066             } else {
00067                 LAPACKE_zgb_trans( matrix_order, n-1, n-1, kd-1, 0,
00068                                    &in[1], ldin, &out[ldout], ldout );
00069             }
00070         } else {
00071             if( upper ) {
00072                 LAPACKE_zgb_trans( matrix_order, n-1, n-1, 0, kd-1,
00073                                    &in[1], ldin, &out[ldout], ldout );
00074             } else {
00075                 LAPACKE_zgb_trans( matrix_order, n-1, n-1, kd-1, 0,
00076                                    &in[ldin], ldin, &out[1], ldout );
00077             }
00078         }
00079     } else {
00080         /* Non-unit case */
00081         if( upper ) {
00082             LAPACKE_zgb_trans( matrix_order, n, n, 0, kd, in, ldin, out,
00083                                ldout );
00084         } else {
00085             LAPACKE_zgb_trans( matrix_order, n, n, kd, 0, in, ldin, out,
00086                                ldout );
00087         }
00088     }
00089 }


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