psychart/dist/pumpchart/lib.js

View air conditions on a psychrometric chart

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.zero = zero;
var SMath = require("smath");
/**
 * Find the solution (zero) of a function.
 */
function zero(func, left, right, epsilon, maxIterations) {
    if (epsilon === void 0) { epsilon = 1e-6; }
    if (maxIterations === void 0) { maxIterations = 1e6; }
    for (var i = 0; i < maxIterations; i++) {
        var funcLeft = func(left);
        var funcRight = func(right);
        if (Number.isNaN(funcLeft)) {
            throw new Error("f(".concat(left, ") is NaN"));
        }
        if (Number.isNaN(funcRight)) {
            throw new Error("f(".concat(right, ") is NaN"));
        }
        var leftSign = Math.sign(funcLeft);
        var rightSign = Math.sign(funcRight);
        if (SMath.approx(funcLeft, 0, epsilon)) {
            return left;
        }
        if (SMath.approx(funcRight, 0, epsilon)) {
            return right;
        }
        if (leftSign === rightSign) {
            throw new Error('A solution cannot be found.');
        }
        var mid = (left + right) / 2;
        var funcMid = func(mid);
        var midSign = Math.sign(funcMid);
        if (SMath.approx(funcMid, 0, epsilon)) {
            return mid;
        }
        if (midSign === leftSign) {
            left = mid;
        }
        else {
            right = mid;
        }
    }
    return (left + right) / 2;
}