function randomPoisson(lambda) {
var Exp = d3r.randomExponential(1);
return function() {
var acc = 0, l = lambda;
while (l > 16) {
var n = Math.floor(0.875 * l),
t = randomGamma(n, 1)();
if (t > l) {
return acc + randomBinomial(n - 1, l / t)();
}
acc += n;
l -= t;
}
for (var s = Exp(), k = 0; s <= l; ++k) s += Exp();
return acc + k;
};
}
// times in milliseconds
[timefunc(randomPoissonSimple(100)), timefunc(randomPoisson(100)), timefunc(randomPoisson(1e12))]
function timefunc(f) {
var start = performance.now(),
A = Array.from({length: 100000}, f),
end = performance.now();
return end - start;
}
Purpose-built for displays of data
Observable is your go-to platform for exploring data and creating expressive data visualizations. Use reactive JavaScript notebooks for prototyping and a collaborative canvas for visual data exploration and dashboard creation.
