这篇文章主要介绍了基于代数方程库Algebra.js解二元一次方程功能,结合具体实例形式分析了方程库Algebra.js计算方程的具体使用技巧,需要的朋友可以参考下
本文实例讲述了基于代数方程库Algebra.js解二元一次方程功能。分享给大家供大家参考,具体如下:
假设二元一次方程如下:
x + y = 11
x - y = 5
解方程如下:
测试algebra函数库(解两元一次方程)var Fraction = algebra.Fraction;
var Expression = algebra.Expression;
var Equation = algebra.Equation;
//=======================================
var x1 = algebra.parse("x+y=11");
var answer1 = x1.solveFor("y");
//console.log("y = " + answer1.toString());
var x2 = algebra.parse("x-y=5");
var answer2 = x2.solveFor("y");
//console.log("y = " + answer2.toString());
//=================================================
//解出X值
var eq = new Equation(answer1, answer2);
console.log("x表达式:" + eq.toString());
var answerX = eq.solveFor("x");
console.log("解出X的值为:" + answerX.toString());
//=================================================
//解出Y值(把x的值代入x1或x2)
eq = x1.eval({
x: answerX
});
console.log("y表达式:" + eq.toString());
var answerY = eq.solveFor("y");
console.log("解出Y的值为:" + answerY.toString());
控制台输出:x表达式:-x + 11 = x - 5
解出X的值为:8
y表达式:y + 8 = 11
解出Y的值为:3
代码写得很粗旷,无任何包装。看得懂就好。