/*
 * $Id: do_fit.h,v 1.14 2003/11/17 21:50:39 spoel Exp $
 * 
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 * Copyright (c) 1991-2000, University of Groningen, The Netherlands.
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#ifndef _do_fit_h
#define _do_fit_h

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif


extern real calc_similar_ind(bool bRho,int nind,atom_id *index,real mass[],
			     rvec x[],rvec xp[]);
/* Returns RMSD or Rho (depending on bRho) over all atoms in index */

extern real rmsdev_ind(int nind,atom_id index[],real mass[],
		       rvec x[],rvec xp[]);
/* Returns the RMS Deviation betweem x and xp over all atoms in index */

extern real rmsdev(int natoms,real mass[],rvec x[],rvec xp[]);
/* Returns the RMS Deviation betweem x and xp over all atoms */

extern real rhodev_ind(int nind,atom_id index[],real mass[],rvec x[],rvec xp[]);
/* Returns size-independent Rho similarity parameter over all atoms in index
 * Maiorov & Crippen, PROTEINS 22, 273 (1995).
 */
 
extern real rhodev(int natoms,real mass[],rvec x[],rvec xp[]);
/* Returns size-independent Rho similarity parameter over all atoms
 * Maiorov & Crippen, PROTEINS 22, 273 (1995).
 */

extern void calc_fit_R(int natoms,real *w_rls,rvec *xp,rvec *x,matrix R);
/* Calculates the rotation matrix R for which
 * sum_i w_rls_i (xp_i - R x_i).(xp_i - R x_i)
 * is minimal. This matrix is also used do_fit.
 * x_rotated[i] = sum R[i][j]*x[j]
 */

extern void do_fit(int natoms,real *w_rls,rvec *xp,rvec *x);
/* Do a least squares fit of x to xp. Atoms which have zero mass
 * (w_rls[i]) are not taken into account in fitting.
 * This makes is possible to fit eg. on Calpha atoms and orient
 * all atoms. The routine only fits the rotational part,
 * therefore both xp and x should be centered round the origin.
 */

extern void reset_x(int ncm,atom_id ind_cm[],
		    int nreset,atom_id *ind_reset,rvec x[],real mass[]);
/* Put the center of mass of atoms in the origin.
 * The center of mass is computed from the index ind_cm.
 * When ind_reset!=NULL the coordinates indexed by ind_reset are reset.
 * When ind_reset==NULL the coordinates up to nreset are reset.
 */

#endif	/* _do_fit_h */
