#ifndef _NR_UTILS_H_
#define _NR_UTILS_H_

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

static double 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))

void nrerror(char error_text[]);

double *vector(long nl, long nh);

double **matrix(long nrl, long nrh, long ncl, long nch);

void free_vector(double *v, long nl, long nh);

void free_matrix(double **m, long nrl, long nrh, long ncl, long nch);

#endif /* _NR_UTILS_H_ */
