简化和评估数学字符串 [英] Simplifying and evaluating mathematical strings

问题描述

在 VB 中评估/简化数学字符串的最简单方法是什么?

What would be the simplest way to evaluate/simplify a mathematical string in VB?

例如:"k*k+(5+2*5)k+k"将简化为"k^2+15k+k"，而"5^2+3"将评估为28.

For example: "k*k+(5+2*5)k+k" would simplify to "k^2+15k+k" and "5^2+3" would evaluate to 28.

要求值，我只是通过使用评价函数来使用 NCalc ，但是它不能简化表达式. 简化方程式的最简单方法是什么?

To evaluate, I'm using NCalc by simply using the evaluate function, but it doesn't simplify expressions. What would be the simplest way of simplifying the equations?

推荐答案

您可以尝试 Math.NET符号.

它不知道"(a)b的隐式乘法，因此，如果不需要，您必须弄清楚如何插入*.

It doesn't "know" about the implied multiplication for (a)b, so you would have to work out how to insert an * if you can't require it.

Imports MathNet.Symbolics
Imports Expr = MathNet.Symbolics.SymbolicExpression

Module Module1

    Sub Main()
        Dim a = Expr.Parse("k*k+(5+2*5)*k+k")
        Console.WriteLine(a.ToString())
        Console.WriteLine(Expr.Parse("5^2+3"))

        Console.ReadLine()

    End Sub

End Module

输出:

16 * k + k ^ 2
28

16*k + k^2
28

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