Simplifying and evaluating mathematical strings

Question

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

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

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?

score 1 · Accepted Answer · answered Dec 22 '19 at 13:37

You could try Math.NET Symbolics.

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

Outputs:

16*k + k^2
28

Thank you, this is exactly what I needed I think. – ryan Dec 22 '19 at 13:56 — ryan, Dec 22 '19 at 13:56

Simplifying and evaluating mathematical strings

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