C++ (Cpp) _arb_poly_revert_series_lagrange_fast Examples

Example #1

File: revert_series_lagrange_fast.c Project: bluescarni/arb

void
arb_poly_revert_series_lagrange_fast(arb_poly_t Qinv,
                                    const arb_poly_t Q, long n, long prec)
{
    long Qlen = Q->length;

    if (Qlen < 2 || !arb_is_zero(Q->coeffs)
                 || arb_contains_zero(Q->coeffs + 1))
    {
        printf("Exception (arb_poly_revert_series_lagrange_fast). Input \n"
               "must have zero constant term and nonzero coefficient of x^1.\n");
        abort();
    }

    if (Qinv != Q)
    {
        arb_poly_fit_length(Qinv, n);
        _arb_poly_revert_series_lagrange_fast(Qinv->coeffs, Q->coeffs, Qlen, n, prec);
    }
    else
    {
        arb_poly_t t;
        arb_poly_init2(t, n);
        _arb_poly_revert_series_lagrange_fast(t->coeffs, Q->coeffs, Qlen, n, prec);
        arb_poly_swap(Qinv, t);
        arb_poly_clear(t);
    }

    _arb_poly_set_length(Qinv, n);
    _arb_poly_normalise(Qinv);
}

Example #2

File: revert_series.c Project: isuruf/arb

void
_arb_poly_revert_series(arb_ptr Qinv,
    arb_srcptr Q, slong Qlen, slong n, slong prec)
{
    _arb_poly_revert_series_lagrange_fast(Qinv, Q, Qlen, n, prec);
}