108 lines
3.3 KiB
C
108 lines
3.3 KiB
C
/***************************************************************************
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TITLE: ls_matrix.h
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----------------------------------------------------------------------------
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FUNCTION: Header file for general real matrix routines.
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The routines in this module have come more or less from ref [1].
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Note that, probably due to the heritage of ref [1] (which has a
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FORTRAN version that was probably written first), the use of 1 as
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the first element of an array (or vector) is used. This is accomplished
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in memory by allocating, but not using, the 0 elements in each dimension.
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While this wastes some memory, it allows the routines to be ported more
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easily from FORTRAN (I suspect) as well as adhering to conventional
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matrix notation. As a result, however, traditional ANSI C convention
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(0-base indexing) is not followed; as the authors of ref [1] point out,
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there is some question of the portability of the resulting routines
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which sometimes access negative indexes. See ref [1] for more details.
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----------------------------------------------------------------------------
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MODULE STATUS: developmental
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----------------------------------------------------------------------------
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GENEALOGY: Created 950222 E. B. Jackson
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----------------------------------------------------------------------------
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DESIGNED BY: from Numerical Recipes in C, by Press, et. al.
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CODED BY: Bruce Jackson
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MAINTAINED BY:
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----------------------------------------------------------------------------
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MODIFICATION HISTORY:
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DATE PURPOSE BY
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CURRENT RCS HEADER:
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$Header$
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$Log$
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Revision 1.1 1998/06/27 22:34:58 curt
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Initial revision.
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* Revision 1.1 1995/02/27 20:02:18 bjax
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* Initial revision
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*
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----------------------------------------------------------------------------
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REFERENCES: [1] Press, William H., et. al, Numerical Recipes in
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C, 2nd edition, Cambridge University Press, 1992
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----------------------------------------------------------------------------
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CALLED BY:
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----------------------------------------------------------------------------
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CALLS TO:
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----------------------------------------------------------------------------
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INPUTS:
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----------------------------------------------------------------------------
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OUTPUTS:
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--------------------------------------------------------------------------*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <math.h>
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#define NR_END 1
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/* matrix creation & destruction routines */
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int *nr_ivector(long nl, long nh);
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double **nr_matrix(long nrl, long nrh, long ncl, long nch);
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void nr_free_ivector(int *v, long nl /* , long nh */);
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void nr_free_matrix(double **m, long nrl, long nrh, long ncl, long nch);
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/* Gauss-Jordan inversion routine */
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int nr_gaussj(double **a, int n, double **b, int m);
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/* Linear equation solution by Gauss-Jordan elimination. a[1..n][1..n] is */
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/* the input matrix. b[1..n][1..m] is input containing the m right-hand */
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/* side vectors. On output, a is replaced by its matrix invers, and b is */
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/* replaced by the corresponding set of solution vectors. */
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/* Note: this routine modified by EBJ to make b optional, if m == 0 */
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/* Matrix copy, multiply, and printout routines (by EBJ) */
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void nr_copymat(double **orig, int n, double **copy);
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void nr_multmat(double **m1, int n, double **m2, double **prod);
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void nr_printmat(double **a, int n);
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