Horner method class
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50
horner.ts
Normal file
50
horner.ts
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class Horner {
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constants: number[];
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constructor(constants: number[]) {
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this.constants = constants;
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}
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candidates() {
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// Not effective solution
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let max = Math.abs(this.constants[0]) + Math.abs(this.constants[this.constants.length - 1]);
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let min = 1;
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let candidates: number[] = [];
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for(let i = min; i<=max; i++) {
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candidates.push(i);
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candidates.push(-i);
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}
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return candidates;
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}
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functional_value(number: number) {
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let new_polynom = [this.constants[0]];
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for(let i=1; i<this.constants.length; i++) {
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new_polynom.push(this.constants[i] + (new_polynom[new_polynom.length - 1] * number));
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}
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return new_polynom;
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}
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functional_value_0(): [number[], number] | void {
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let c = this.candidates();
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for(let i=0; i<c.length; i++) {
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let new_polynom = this.functional_value(c[i]);
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if(new_polynom[new_polynom.length - 1] == 0) return [new_polynom, c[i]];
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}
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}
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static roots(horner: Horner) {
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let roots: number[] = [];
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while(true) {
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let r = horner.functional_value_0();
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if(!r) return [roots, horner.constants];
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let [new_polynom, root] = r;
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roots.push(root);
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new_polynom.pop();
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if(new_polynom.length < 3) return [roots, new_polynom];
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horner = new Horner(new_polynom);
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}
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}
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}
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