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/***********************************************************************

sc.h - creates classifiers from feature vectors of examples, as well as

   classifying example feature vectors.

Copyright (C) 1991 Dean Rubine

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 1, 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 (in ../COPYING); if not, write to the Free

Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

***********************************************************************/

/*

 single path classifier

*/

#ifndef _SC_H_

#define _SC_H_

#define MAXSCLASSES     100

typedef struct sclassifier *sClassifier; /* single feature-vector classifier */

typedef int                 sClassIndex; /* single feature-vector class index */

typedef struct sclassdope  *sClassDope;  /* single feature-vector class dope */

struct sclassdope {

        char            *name;

        sClassIndex     number;

        Vector          average;

        Matrix          sumcov;

        int             nexamples;

};

struct sclassifier {

        int             nfeatures;

        int             nclasses;

        sClassDope      *classdope;

        Vector          cnst;   /* constant term of discrimination function */

        Vector          *w;     /* array of coefficient weights */

        Matrix          invavgcov; /* inverse covariance matrix */

};

sClassifier     sNewClassifier();

sClassifier     sRead();                /* FILE *f */

void            sWrite();               /* FILE *f; sClassifier sc; */

void            sFreeClassifier();      /* sc */

void            sAddExample();          /* sc, char *classname; Vector y */

void            sRemoveExample();       /* sc, classname, y */

void            sDoneAdding();          /* sc */

sClassDope      sClassify();            /* sc, y */

sClassDope      sClassifyAD();          /* sc, y, double *ap; double *dp */

sClassDope      sClassNameLookup();     /* sc, classname */

double          MahalanobisDistance();  /* Vector v, u; Matrix sigma */

void            FixClassifier();

void            sDumpClassifier();

void            sDistances();

#endif