theta.h

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#ifndef OAKFIELD_MATH_THETA_H
#define OAKFIELD_MATH_THETA_H
 
#include <stddef.h>
 
#ifdef __cplusplus
extern "C" {
#endif
 
typedef enum theta_status {
    THETA_STATUS_OK = 0,        
    THETA_STATUS_DOMAIN_ERROR,  
    THETA_STATUS_SINGULAR,      
    THETA_STATUS_NO_CONVERGENCE 
} theta_status;
 
typedef struct theta_eval {
    double value;        
    double abs_error;    
    size_t terms_used;   
    theta_status status; 
} theta_eval;
 
const char *theta_status_string(theta_status status);
 
theta_eval theta1_norm_eval(double z, double q, double s1, double c1);
 
theta_eval theta_square_eval(double z, double q, double s1, double c1);
 
theta_eval theta_saw_unit_eval(double z, double q, double s1, double c1);
 
theta_eval theta_triangle_eval(double z, double q, double s1, double c1);
 
/* Backward-compatible scalar wrappers. These return NaN if evaluation fails. */
double theta1_norm(double z, double q, double s1, double c1);
double theta_square(double z, double q, double s1, double c1);
double theta_saw_unit(double z, double q, double s1, double c1);
double theta_triangle(double z, double q, double s1, double c1);
 
#ifdef __cplusplus
}
#endif
 
#endif /* OAKFIELD_MATH_THETA_H */