@tubular/math/dist/zero-finder.js

Miscellaneous math functions

export class ZeroFinder {
    constructor(zeroSeekingFunction, tolerance, maxIterations, x1, y1, x2, y2) {
        this.zeroSeekingFunction = zeroSeekingFunction;
        this.tolerance = tolerance;
        this.maxIterations = maxIterations;
        this.x1 = x1;
        this.y1 = y1;
        this._iterationCount = 0;
        if (x2 == null) {
            this.x2 = y1;
            this.y1 = zeroSeekingFunction(x1);
            this.y2 = zeroSeekingFunction(y1);
        }
        else {
            this.x2 = x2;
            this.y2 = y2;
        }
    }
    getXAtZero() {
        let x;
        this._iterationCount = 0;
        while (++this._iterationCount <= this.maxIterations) {
            x = this.x1 - this.y1 / (this.y2 - this.y1) * (this.x2 - this.x1);
            this.y = this.zeroSeekingFunction(x);
            if (Math.abs(this.y) <= this.tolerance)
                break;
            if ((this.y1 < this.y2 && this.y < 0.0) || (this.y1 > this.y2 && this.y > 0.0)) {
                this.x1 = x;
                this.y1 = this.y;
            }
            else {
                this.x2 = x;
                this.y2 = this.y;
            }
        }
        return x;
    }
    get lastY() { return this.y; }
    get iterationCount() { return this._iterationCount; }
}
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