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/*===========================================================================
Copyright (C) 2001 European Southern Observatory (ESO)
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of
the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public
License along with this program; if not, write to the Free
Software Foundation, Inc., 675 Massachusetss Ave, Cambridge,
MA 02139, USA.
Corresponding concerning ESO-MIDAS should be addressed as follows:
Internet e-mail: midas@eso.org
Postal address: European Southern Observatory
Data Management Division
Karl-Schwarzschild-Strasse 2
D 85748 Garching bei Muenchen
GERMANY
===========================================================================*/
/*-------------------------------------------------------------------------*/
/**
* @defgroup flames_covariance_reorder Substep: Compute covariance
*
*/
/*-------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------
Includes
--------------------------------------------------------------------------*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <flames_midas_def.h>
#include <flames_covariance_reorder.h>
/**@{*/
/*---------------------------------------------------------------------------
Implementation
---------------------------------------------------------------------------*/
/**
@name flames_correl()
@short Compute correlation
@author G. Mulas - ITAL_FLAMES Consortium. Ported to CPL by A. Modigliani
@param covar covaraiance matrix
@param ma total number of parameters
@param ia order of parameters
@param mfit order of fit
@return void
Purpose : Given the covariance matrix covar[1.. ma][1..ma] of a fit for
mfit of ma total parameters, and their ordering ia[1..ma]
repack the covariance matrix to the true order of the
parameters. Elements associated with fixed parameters will
zero.
Input: covar[][] covariance matrix
ma matrix dimension
ia[] parameter ordering
mfit number of parameters to fit
Output: covar[][] repacked
DRS Functions called:
none
Pseudocode:
see code: nested loops with if statements to repack covar[][]
@note
*/
void flames_covariance_reorder(double **covar, int ma, int ia[], int mfit)
{
int i=0,j=0,k=0;
double swap=0;
for (i=mfit+1;i<=ma;i++)
for (j=1;j<=i;j++) covar[i][j]=covar[j][i]=0.0;
k=mfit;
for (j=ma;j>=1;j--) {
if (ia[j]) {
for (i=1;i<=ma;i++) {
swap = covar[i][k];
covar[i][k] = covar[i][j];
covar[i][j] = swap;
}
for (i=1;i<=ma;i++) {
swap = covar[k][i];
covar[k][i] = covar[j][i];
covar[j][i] = swap;
}
k--;
}
}
}
/**@}*/
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