Function approx1

src/api/cpp/approx.cpp:15–20

namespace af {
array approx1(const array &yi, const array &xo, const interpType method,
              const float offGrid) {
    af_array yo = 0;
    AF_THROW(af_approx1(&yo, yi.get(), xo.get(), method, offGrid));
    return array(yo);
}

array approx2(const array &zi, const array &xo, const array &yo,
              const interpType method, const float offGrid) {