/usr/include/vtk-7.1/alglib/rotations.h is in libvtk7-dev 7.1.1+dfsg1-2.
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Copyright (c) 1992-2007 The University of Tennessee. All rights reserved.
Contributors:
* Sergey Bochkanov (ALGLIB project). Translation from FORTRAN to
pseudocode.
See subroutines comments for additional copyrights.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
- Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
- Redistributions in binary form must reproduce the above copyright
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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*************************************************************************/
#ifndef _rotations_h
#define _rotations_h
#include "alglib/ap.h"
/*************************************************************************
Application of a sequence of elementary rotations to a matrix
The algorithm pre-multiplies the matrix by a sequence of rotation
transformations which is given by arrays C and S. Depending on the value
of the IsForward parameter either 1 and 2, 3 and 4 and so on (if IsForward=true)
rows are rotated, or the rows N and N-1, N-2 and N-3 and so on, are rotated.
Not the whole matrix but only a part of it is transformed (rows from M1 to
M2, columns from N1 to N2). Only the elements of this submatrix are changed.
Input parameters:
IsForward - the sequence of the rotation application.
M1,M2 - the range of rows to be transformed.
N1, N2 - the range of columns to be transformed.
C,S - transformation coefficients.
Array whose index ranges within [1..M2-M1].
A - processed matrix.
WORK - working array whose index ranges within [N1..N2].
Output parameters:
A - transformed matrix.
Utility subroutine.
*************************************************************************/
ALGLIB_EXPORT
void applyrotationsfromtheleft(bool isforward,
int m1,
int m2,
int n1,
int n2,
const ap::real_1d_array& c,
const ap::real_1d_array& s,
ap::real_2d_array& a,
ap::real_1d_array& work);
/*************************************************************************
Application of a sequence of elementary rotations to a matrix
The algorithm post-multiplies the matrix by a sequence of rotation
transformations which is given by arrays C and S. Depending on the value
of the IsForward parameter either 1 and 2, 3 and 4 and so on (if IsForward=true)
rows are rotated, or the rows N and N-1, N-2 and N-3 and so on are rotated.
Not the whole matrix but only a part of it is transformed (rows from M1
to M2, columns from N1 to N2). Only the elements of this submatrix are changed.
Input parameters:
IsForward - the sequence of the rotation application.
M1,M2 - the range of rows to be transformed.
N1, N2 - the range of columns to be transformed.
C,S - transformation coefficients.
Array whose index ranges within [1..N2-N1].
A - processed matrix.
WORK - working array whose index ranges within [M1..M2].
Output parameters:
A - transformed matrix.
Utility subroutine.
*************************************************************************/
ALGLIB_EXPORT
void applyrotationsfromtheright(bool isforward,
int m1,
int m2,
int n1,
int n2,
const ap::real_1d_array& c,
const ap::real_1d_array& s,
ap::real_2d_array& a,
ap::real_1d_array& work);
/*************************************************************************
The subroutine generates the elementary rotation, so that:
[ CS SN ] . [ F ] = [ R ]
[ -SN CS ] [ G ] [ 0 ]
CS**2 + SN**2 = 1
*************************************************************************/
ALGLIB_EXPORT
void generaterotation(double f, double g, double& cs, double& sn, double& r);
#endif
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