alibAdjoint

RWalib C Array Library User Guide > Linear Algebra > alibAdjoint

alibAdjoint

Returns the adjoint (conjugate transpose) of a matrix. Besides the complex data-types, real data-types are also supported, providing a more compact API for the real transpose than that provided by n-dimensional alibTranspose. The PV-WAVE API for this routine is the ADJOINT Function.

Prototypes

void alibAdjointb( wvlong m, wvlong n, UCHAR *p, UCHAR *q )

void alibAdjoints( wvlong m, wvlong n, short *p, short *q )

void alibAdjointi( wvlong m, wvlong n, int *p, int *q )

void alibAdjointl( wvlong m, wvlong n, wvlong *p, wvlong *q )

void alibAdjointf( wvlong m, wvlong n, float *p, float *q )

void alibAdjointd( wvlong m, wvlong n, double *p, double *q )

void alibAdjointc( wvlong m, wvlong n, COMPLEX *p, COMPLEX *q )

void alibAdjointz( wvlong m, wvlong n, DCOMPLEX *p, DCOMPLEX *q )

Parameters

m — (Input) The first dimension of the matrix.

n — (Input) The second dimension of the matrix.

*p — (Input) The source array, i.e., (m,n) matrix.

*q — (Input/Output) The destination array. On return, array q contains the (n,m) matrix which is the conjugate transpose of the input matrix. For real inputs, this is just the transpose of the input.

Example

Here we show a basic example with complex data, and then for real data we show how to rotate a matrix by 90 degree increments.

#include <stdio.h>

#include <stdlib.h>

#include <math.h>

#include "alib.h"

void main() {

   /* input and output arrays to be used in all the examples */

   UCHAR    b0[6], b[6], b1[6];

   COMPLEX  c0[6], c[6];

   /* initialize the data */

   alibinit( NULL, NULL, NULL, NULL );

   alibIndexb( 6, 0, 1, b0 );

   alibIndexc( 6, cmplxflt(0,0), cmplxflt(1,-1), c0 );

   printf( "\n\n print (2,3) matrix c0 and its adjoint" );

      alibPrintArrayc( 1, 1, 2, 3, c0, NULL );

      alibAdjointc( 2, 3, c0, c );

      alibPrintArrayc( 1, 1, 3, 2, c, NULL );

   printf( "\n\n print (2,3) matrix b0 and then rotate it by 90 degrees" );

      alibPrintArrayb( 1, 1, 2, 3, b0, NULL );

      alibAdjointb( 2, 3, b0, b1 );

      alibFlipDimb( 0, 3, 2, b1, b );

      alibPrintArrayb( 1, 1, 3, 2, b, NULL );

   printf( "\n\n print (2,3) matrix b0 and then rotate it by 180 degrees" );

      alibPrintArrayb( 1, 1, 2, 3, b0, NULL );

      alibFlipDimb( 0, 2, 3, b0, b1 );

      alibFlipDimb( 1, 2, 3, b1, b );

      alibPrintArrayb( 1, 1, 2, 3, b, NULL );

   printf( "\n\n print (2,3) matrix b0 and then rotate it by -90 degrees" );

      alibPrintArrayb( 1, 1, 2, 3, b0, NULL );

      alibAdjointb( 2, 3, b0, b1 );

      alibFlipDimb( 1, 3, 2, b1, b );

      alibPrintArrayb( 1, 1, 3, 2, b, NULL );

Output:

 print (2,3) matrix c0 and its adjoint

(  0.000e+00,  0.000e+00) (  1.000e+00, -1.000e+00) (  2.000e+00, -2.000e+00)

(  3.000e+00, -3.000e+00) (  4.000e+00, -4.000e+00) (  5.000e+00, -5.000e+00)

(  0.000e+00, -0.000e+00) (  3.000e+00,  3.000e+00)

(  1.000e+00,  1.000e+00) (  4.000e+00,  4.000e+00)

(  2.000e+00,  2.000e+00) (  5.000e+00,  5.000e+00)

 print (2,3) matrix b0 and then rotate it by 90 degrees

   0   1   2

   3   4   5

   2   5

   1   4

   0   3

 print (2,3) matrix b0 and then rotate it by 180 degrees

   0   1   2

   3   4   5

   5   4   3

   2   1   0

 print (2,3) matrix b0 and then rotate it by -90 degrees

   0   1   2

   3   4   5

   3   0

   4   1

   5   2

Version 2017.0