import mir.math.common;

auto n = 5;
auto x = new double[n];
auto w = new double[n];
auto work = new double[(n + 1) ^^ 2];

gaussLegendreQuadrature(x, w, work);

static immutable xc =
   [-0.90617985,
    -0.53846931,
     0.        ,
     0.53846931,
     0.90617985];

static immutable wc =
   [0.23692689,
    0.47862867,
    0.56888889,
    0.47862867,
    0.23692689];

foreach (i; 0 .. n)
{
    assert(x[i].approxEqual(xc[i]));
    assert(w[i].approxEqual(wc[i]));
}