Variadic user defined functions

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The tutorial consists of more than 200 live examples from 50 sections. Each of the examples can be copied and run on your own environment. In addition, mXparser provides an extensive collection of over 500 built-in math functions, expressions and symbols. Familiarize yourself with the scope and the syntax. Live testing is the best way to learn. Good luck! 🙂

Tutorial Math Collection API spec Download

Below is the code for JAVA, the code for C# is almost identical.

Case 1: Function returning number of parameters provided

import org.mariuszgromada.math.mxparser.*;
...
Function f = new Function("f(...) = [npar]");
Expression e1 = new Expression("f(5)", f);
Expression e2 = new Expression("f(5,2)", f);
Expression e3 = new Expression("f(5,2,4)", f);
mXparser.consolePrintln("Res 1: " + e1.getExpressionString() + " = " + e1.calculate());
mXparser.consolePrintln("Res 2: " + e2.getExpressionString() + " = " + e2.calculate());
mXparser.consolePrintln("Res 3: " + e3.getExpressionString() + " = " + e3.calculate());
[mXparser-v.5.0.0] Res 1: f(5) = 1.0
[mXparser-v.5.0.0] Res 2: f(5,2) = 2.0
[mXparser-v.5.0.0] Res 3: f(5,2,4) = 3.0

Case 2: Function returning sum of first and last parameter provided

import org.mariuszgromada.math.mxparser.*;
...
Function f = new Function("f(...) = par(1) + par([npar])");
Expression e1 = new Expression("f(5)", f);
Expression e2 = new Expression("f(5,2)", f);
Expression e3 = new Expression("f(5,2,4)", f);
mXparser.consolePrintln("Res 1: " + e1.getExpressionString() + " = " + e1.calculate());
mXparser.consolePrintln("Res 2: " + e2.getExpressionString() + " = " + e2.calculate());
mXparser.consolePrintln("Res 3: " + e3.getExpressionString() + " = " + e3.calculate());
[mXparser-v.5.0.0] Res 1: f(5) = 10.0
[mXparser-v.5.0.0] Res 2: f(5,2) = 7.0
[mXparser-v.5.0.0] Res 3: f(5,2,4) = 9.0

Case 3: Function returning parameter at position defined by the first parameter

import org.mariuszgromada.math.mxparser.*;
...
Function f = new Function("f(...) = par(par(1))");
Expression e1 = new Expression("f(5)", f);
Expression e2 = new Expression("f(1,2)", f);
Expression e3 = new Expression("f(3,2,4)", f);
mXparser.consolePrintln("Res 1: " + e1.getExpressionString() + " = " + e1.calculate());
mXparser.consolePrintln("Res 2: " + e2.getExpressionString() + " = " + e2.calculate());
mXparser.consolePrintln("Res 3: " + e3.getExpressionString() + " = " + e3.calculate());
[mXparser-v.5.0.0] Res 1: f(5) = NaN
[mXparser-v.5.0.0] Res 2: f(1,2) = 1.0
[mXparser-v.5.0.0] Res 3: f(3,2,4) = 4.0

Case 4: Function returning sum of all parameters squared

import org.mariuszgromada.math.mxparser.*;
...
Function f = new Function("f(...) = sum(i, 1, [npar], par(i)^2)");
Expression e1 = new Expression("f(5)", f);
Expression e2 = new Expression("f(1,2)", f);
Expression e3 = new Expression("f(3,2,4)", f);
mXparser.consolePrintln("Res 1: " + e1.getExpressionString() + " = " + e1.calculate());
mXparser.consolePrintln("Res 2: " + e2.getExpressionString() + " = " + e2.calculate());
mXparser.consolePrintln("Res 3: " + e3.getExpressionString() + " = " + e3.calculate());
[mXparser-v.5.0.0] Res 1: f(5) = 25.0
[mXparser-v.5.0.0] Res 2: f(1,2) = 5.0
[mXparser-v.5.0.0] Res 3: f(3,2,4) = 29.0

Case 5: Implementing your own Variadic Function Extension

import org.mariuszgromada.math.mxparser.*;
...
class SumVar implements FunctionExtensionVariadic {
    public double calculate(double... parameters) {
        if (parameters == null) return Double.NaN;
        if (parameters.length == 0) return Double.NaN;
        double result = 0;
        for (double x : parameters)
            result+=x;
        return result;
    }
    public FunExtVar clone() {
        return new FunExtVar();
    }
}
import org.mariuszgromada.math.mxparser.*;
...
Function sumVar = new Function("sumVar", new SumVar());
Expression e1 = new Expression("sumVar(1)", sumVar);
Expression e2 = new Expression("sumVar(1,2)", sumVar);
Expression e3 = new Expression("sumVar(1,2,3)", sumVar);
mXparser.consolePrintln("Res 1: " + e1.getExpressionString() + " = " + e1.calculate());
mXparser.consolePrintln("Res 2: " + e2.getExpressionString() + " = " + e2.calculate());
mXparser.consolePrintln("Res 3: " + e3.getExpressionString() + " = " + e3.calculate());
[mXparser-v.5.0.0] Res 1: sumVar(1) = 1.0
[mXparser-v.5.0.0] Res 2: sumVar(1,2) = 3.0
[mXparser-v.5.0.0] Res 3: sumVar(1,2,3) = 6.0
Nuget – Package Manager

Install-Package MathParser.org-mXparser -Version 5.2.0

Nuget – .NET CLI

dotnet add package MathParser.org-mXparser --version 5.2.0

Nuget – Package Reference

<PackageReference Include="MathParser.org-mXparser" Version="5.2.0"/>

Maven – Dependency

<dependency>
<groupid>
org.mariuszgromada.math</groupid>
<artifactid>
MathParser.org-mXparser</artifactid>
<version>
5.2.0</version>
</dependency>

Maven – Gradle

implementation 'org.mariuszgromada.math:MathParser.org-mXparser:5.2.0'

Maven – Gradle (Kotlin)

implementation("org.mariuszgromada.math:MathParser.org-mXparser:5.2.0")

GitHub

git clone https://github.com/mariuszgromada/MathParser.org-mXparser

OTHER DOWNLOAD OPTIONS

Download latest release – v.5.2.0 Orion: .NET bin onlyDownload latest release – v.5.2.0 Orion: JAVA bin onlyDownload latest release – v.5.2.0 Orion: bin + doc

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SOURCE CODE

Source code .zipSource code .tar.gz
View on GitHubMathSpace.pl

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