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#cython: language_level=3, boundscheck=False, wraparound=False, initializedcheck=False, cdivision=True
cdef extern from "gsl/gsl_math.h":
ctypedef struct gsl_function:
double (* function) (double x, void * params) nogil
void * params
cdef extern from "gsl/gsl_integration.h":
ctypedef struct gsl_integration_workspace
ctypedef struct gsl_integration_qaws_table
ctypedef struct gsl_integration_qawo_table
ctypedef struct gsl_integration_cquad_workspace
cdef enum:
GSL_INTEG_GAUSS15 = 1
GSL_INTEG_GAUSS21 = 2
GSL_INTEG_GAUSS31 = 3
GSL_INTEG_GAUSS41 = 4
GSL_INTEG_GAUSS51 = 5
GSL_INTEG_GAUSS61 = 6
cdef enum gsl_integration_qawo_enum:
GSL_INTEG_COSINE, GSL_INTEG_SINE
gsl_integration_cquad_workspace * gsl_integration_cquad_workspace_alloc (size_t n) nogil
void gsl_integration_cquad_workspace_free (gsl_integration_cquad_workspace * w) nogil
int gsl_integration_cquad (gsl_function * f, double a, double b, double epsabs, double epsrel, gsl_integration_cquad_workspace * workspace, double * result, double * abserr, size_t * nevals) nogil
gsl_integration_workspace * gsl_integration_workspace_alloc(size_t n) nogil
void gsl_integration_workspace_free(gsl_integration_workspace * w) nogil
int gsl_integration_qag(gsl_function *f, double a, double b, double epsabs, double epsrel, size_t limit, int key, gsl_integration_workspace * workspace, double * result, double * abserr) nogil
cdef extern from "gsl/gsl_rng.h":
ctypedef struct gsl_rng_type
ctypedef struct gsl_rng
cdef gsl_rng_type *gsl_rng_mt19937
gsl_rng *gsl_rng_alloc ( gsl_rng_type * T) nogil
unsigned long int gsl_rng_get ( gsl_rng * r) nogil
void gsl_rng_set ( gsl_rng * r, unsigned long int seed) nogil
void gsl_rng_free (gsl_rng * r) nogil
double gsl_rng_uniform ( gsl_rng * r) nogil
double gsl_rng_uniform_pos ( gsl_rng * r) nogil
cdef extern from "gsl/gsl_randist.h":
unsigned int gsl_ran_poisson ( gsl_rng * r, double mu) nogil