chebyshev_nodes.c

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#include "s2kit/chebyshev_nodes.h"
 
#include <math.h>
 
void AcosOfChebyshevNodes(const int n, double* eval_points) {
    double denominator = 2. * n;
 
    for (int i = 0; i < n; ++i)
        eval_points[i] = (2. * i + 1.) * M_PI / denominator;
}
 
void ChebyshevNodes(const int n, double* eval_points) {
    double denominator = 2. * n;
 
    for (int i = 0; i < n; ++i)
        eval_points[i] = cos((2. * i + 1.) * M_PI / denominator);
}