“if” and “iff” 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: Mechanics of the if function

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

Case 2: “if” function and arguments

import org.mariuszgromada.math.mxparser.*;
...
Argument x = new Argument("x = 2");
Expression e = new Expression("if(x<3, x+2, x-2)", x);
mXparser.consolePrintln("Res 1: " + " x = " + x.getArgumentValue() + ", " + e.getExpressionString() + " = " + e.calculate());
x.setArgumentValue(4);
mXparser.consolePrintln("Res 2: " + " x = " + x.getArgumentValue() + ", " + e.getExpressionString() + " = " + e.calculate());
[mXparser-v.5.0.0] Res 1:  x = 2.0, if(x<3, x+2, x-2) = 4.0
[mXparser-v.5.0.0] Res 2:  x = 4.0, if(x<3, x+2, x-2) = 2.0

Case 3: “if” function in user defined function

import org.mariuszgromada.math.mxparser.*;
...
Function f = new Function("f(x) = if(x<3, x+2, x-2)");
Expression e1 = new Expression("f(2)", f);
Expression e2 = new Expression("f(4)", f);
mXparser.consolePrintln("Res 1: " + e1.getExpressionString() + " = " + e1.calculate());
mXparser.consolePrintln("Res 2: " + e2.getExpressionString() + " = " + e2.calculate());
[mXparser-v.5.0.0] Res 1: f(2) = 4.0
[mXparser-v.5.0.0] Res 2: f(4) = 2.0

Case 4: Mechanics of the “iff” function

import org.mariuszgromada.math.mxparser.*;
...
Argument x = new Argument("x = 0.5");
Expression e = new Expression("iff(x<1, 1; x<2, 2; x<3, 3)", x);
mXparser.consolePrintln("Res 1: " + " x = " + x.getArgumentValue() + ", " + e.getExpressionString() + " = " + e.calculate());
x.setArgumentValue(1.5);
mXparser.consolePrintln("Res 2: " + " x = " + x.getArgumentValue() + ", " + e.getExpressionString() + " = " + e.calculate());
x.setArgumentValue(2.5);
mXparser.consolePrintln("Res 3: " + " x = " + x.getArgumentValue() + ", " + e.getExpressionString() + " = " + e.calculate());
x.setArgumentValue(3.5);
mXparser.consolePrintln("Res 4: " + " x = " + x.getArgumentValue() + ", " + e.getExpressionString() + " = " + e.calculate());
[mXparser-v.5.0.0] Res 1:  x = 0.5, iff(x<1, 1; x<2, 2; x<3, 3) = 1.0
[mXparser-v.5.0.0] Res 1:  x = 1.5, iff(x<1, 1; x<2, 2; x<3, 3) = 2.0
[mXparser-v.5.0.0] Res 1:  x = 2.5, iff(x<1, 1; x<2, 2; x<3, 3) = 3.0
[mXparser-v.5.0.0] Res 1:  x = 3.5, iff(x<1, 1; x<2, 2; x<3, 3) = NaN

Case 5: “iff” function is not limited in number of cases

import org.mariuszgromada.math.mxparser.*;
...
Argument x = new Argument("x = 0.5");
Expression e = new Expression("iff(x<1, 1; x<2, 2; x<3, 3; x<4, 4; x<5, 5)", x);
mXparser.consolePrintln("Res 1: " + " x = " + x.getArgumentValue() + ", " + e.getExpressionString() + " = " + e.calculate());
x.setArgumentValue(1.5);
mXparser.consolePrintln("Res 2: " + " x = " + x.getArgumentValue() + ", " + e.getExpressionString() + " = " + e.calculate());
x.setArgumentValue(2.5);
mXparser.consolePrintln("Res 3: " + " x = " + x.getArgumentValue() + ", " + e.getExpressionString() + " = " + e.calculate());
x.setArgumentValue(3.5);
mXparser.consolePrintln("Res 4: " + " x = " + x.getArgumentValue() + ", " + e.getExpressionString() + " = " + e.calculate());
x.setArgumentValue(4.5);
mXparser.consolePrintln("Res 5: " + " x = " + x.getArgumentValue() + ", " + e.getExpressionString() + " = " + e.calculate());
[mXparser-v.5.0.0] Res 1:  x = 0.5, iff(x<1, 1; x<2, 2; x<3, 3; x<4, 4; x<5, 5) = 1.0
[mXparser-v.5.0.0] Res 2:  x = 1.5, iff(x<1, 1; x<2, 2; x<3, 3; x<4, 4; x<5, 5) = 2.0
[mXparser-v.5.0.0] Res 3:  x = 2.5, iff(x<1, 1; x<2, 2; x<3, 3; x<4, 4; x<5, 5) = 3.0
[mXparser-v.5.0.0] Res 4:  x = 3.5, iff(x<1, 1; x<2, 2; x<3, 3; x<4, 4; x<5, 5) = 4.0
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

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View on GitHubMathSpace.pl

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