void nrerror(char error_text[]);
float *vector(long nl, long nh);
int *ivector(long nl,long nh);
unsigned long *lvector(long nl,long nh);
double *dvector(long nl, long nh);
double **dmatrix(long nrl, long nrh, long ncl, long nch);
void free_vector(float *v, long nl, long nh);
void free_ivector(int *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_dmatrix(double **m, long nrl, long nrh, long ncl, long nch);