lineq.h

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# define    rowst   spar_rowst
# define    colst   spar_colst
# define    neqn    spar_neqn
# define    eqord   spar_eqord
# define    varord  spar_varord
# define    rhs spar_rhs
# define    matsol  spar_matsol
# define    getelm  spar_getelm
# define    bksub   spar_bksub
# define    prmat   spar_prmat
# define    subrow  spar_subrow
# define    remelm  spar_remelm

#include <stdio.h>

struct elm
{
    unsigned row;       /* Row location */
    unsigned col;       /* Column location */
    double value;       /* The value */
    struct elm *r_up;   /* Link to element in same column */
    struct elm *r_down; /*  not ordered list */
    struct elm *c_left; /* Link to left element in same row */
    struct elm *c_right;    /*  this list is ordered (see getelm) */
};

#define ELM0    (struct elm *)0
extern struct elm **rowst;      /* link to first element in row */
extern struct elm **colst;      /* link to a column element */
extern unsigned neqn;           /* number of equations */
extern unsigned *eqord;         /* row order for pivots */
extern unsigned *varord;            /* column order for pivots */
extern double *rhs;         /* initially- right hand side
                    finally - answer */
extern int matsol(void);
extern struct elm *getelm(struct elm*, unsigned, unsigned);
extern void remelm(struct elm*);
extern void subrow(struct elm*, struct elm*);
extern void bksub(void);
extern void prmat(void);