Function tanh

docs/app/js/sanddance-app.js:128582–128584

(x)

    return ((x = Math.exp(x)) - 1 / x) / 2;
}
function tanh(x) {
    return ((x = Math.exp(2 * x)) - 1) / (x + 1);
}
exports.default = function zoomRho(rho, rho2, rho4) {
    // p0 = [ux0, uy0, w0]
    // p1 = [ux1, uy1, w1]