<a href="nrutil.c.html">nrutil</a>.h.html

    #ifndef _NR_UTILS_H_
    #define _NR_UTILS_H_

    static float sqrarg;
    #define SQR(a) ((sqrarg=(a)) == 0.0 ? 0.0 : sqrarg*sqrarg)

    static double dsqrarg;
    #define DSQR(a) ((dsqrarg=(a)) == 0.0 ? 0.0 : dsqrarg*dsqrarg)

    static double dmaxarg1,dmaxarg2;
    #define DMAX(a,b) (dmaxarg1=(a),dmaxarg2=(b),(dmaxarg1) > (dmaxarg2) ?\
            (dmaxarg1) : (dmaxarg2))

    static double dminarg1,dminarg2;
    #define DMIN(a,b) (dminarg1=(a),dminarg2=(b),(dminarg1) < (dminarg2) ?\
            (dminarg1) : (dminarg2))

    static float maxarg1,maxarg2;
    #define FMAX(a,b) (maxarg1=(a),maxarg2=(b),(maxarg1) > (maxarg2) ?\
            (maxarg1) : (maxarg2))

    static float minarg1,minarg2;
    #define FMIN(a,b) (minarg1=(a),minarg2=(b),(minarg1) < (minarg2) ?\
            (minarg1) : (minarg2))

    static long lmaxarg1,lmaxarg2;
    #define LMAX(a,b) (lmaxarg1=(a),lmaxarg2=(b),(lmaxarg1) > (lmaxarg2) ?\
            (lmaxarg1) : (lmaxarg2))

    static long lminarg1,lminarg2;
    #define LMIN(a,b) (lminarg1=(a),lminarg2=(b),(lminarg1) < (lminarg2) ?\
            (lminarg1) : (lminarg2))

    static int imaxarg1,imaxarg2;
    #define IMAX(a,b) (imaxarg1=(a),imaxarg2=(b),(imaxarg1) > (imaxarg2) ?\
            (imaxarg1) : (imaxarg2))

    static int iminarg1,iminarg2;
    #define IMIN(a,b) (iminarg1=(a),iminarg2=(b),(iminarg1) < (iminarg2) ?\
            (iminarg1) : (iminarg2))

    #define SIGN(a,b) ((b) >= 0.0 ? fabs(a) : -fabs(a))

    #if defined(__STDC__) || defined(ANSI) || defined(NRANSI) /* ANSI */

    void nrerror(char error_text[]);
    float *vector(long nl, long nh);
    int *ivector(long nl, long nh);
    unsigned char *cvector(long nl, long nh);
    unsigned long *lvector(long nl, long nh);
    double *dvector(long nl, long nh);
    float **matrix(long nrl, long nrh, long ncl, long nch);
    double **dmatrix(long nrl, long nrh, long ncl, long nch);
    int **imatrix(long nrl, long nrh, long ncl, long nch);
    float **submatrix(float **a, long oldrl, long oldrh, long oldcl, long oldch,
        long newrl, long newcl);
    float **convert_matrix(float *a, long nrl, long nrh, long ncl, long nch);
    float ***f3tensor(long nrl, long nrh, long ncl, long nch, long ndl, long ndh);
    void free_vector(float *v, long nl, long nh);
    void free_ivector(int *v, long nl, long nh);
    void free_cvector(unsigned char *v, long nl, long nh);
    void free_lvector(unsigned long *v, long nl, long nh);
    void free_dvector(double *v, long nl, long nh);
    void free_matrix(float **m, long nrl, long nrh, long ncl, long nch);
    void free_dmatrix(double **m, long nrl, long nrh, long ncl, long nch);
    void free_imatrix(int **m, long nrl, long nrh, long ncl, long nch);
    void free_submatrix(float **b, long nrl, long nrh, long ncl, long nch);
    void free_convert_matrix(float **b, long nrl, long nrh, long ncl, long nch);
    void free_f3tensor(float ***t, long nrl, long nrh, long ncl, long nch,
        long ndl, long ndh);

    #else /* ANSI */
    /* traditional - K&R */

    void nrerror();
    float *vector();
    float **matrix();
    float **submatrix();
    float **convert_matrix();
    float ***f3tensor();
    double *dvector();
    double **dmatrix();
    int *ivector();
    int **imatrix();
    unsigned char *cvector();
    unsigned long *lvector();
    void free_vector();
    void free_dvector();
    void free_ivector();
    void free_cvector();
    void free_lvector();
    void free_matrix();
    void free_submatrix();
    void free_convert_matrix();
    void free_dmatrix();
    void free_imatrix();
    void free_f3tensor();

    #endif /* ANSI */

    #endif /* _NR_UTILS_H_ */