Working with NaN – Not-a-Number

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

Case 1: NaN in condition

import org.mariuszgromada.math.mxparser.*;
...
Argument x = new Argument("x = 1");
Expression e = new Expression("if( isNaN( 2 / x ), 1, -1 )", x);
mXparser.consolePrintln("Res 1: x = " + x.getArgumentValue() + ", " + e.getExpressionString() + " = " + e.calculate());
x.setArgumentValue(0);
mXparser.consolePrintln("Res 2: x = " + x.getArgumentValue() + ", " + e.getExpressionString() + " = " + e.calculate());
[mXparser-v.5.0.0] Res 1: x = 1.0, if( isNaN( 2 / x ), 1, -1 ) = -1.0
[mXparser-v.5.0.0] Res 2: x = 0.0, if( isNaN( 2 / x ), 1, -1 ) = 1.0

Case 2: NaN symbol

import org.mariuszgromada.math.mxparser.*;
...
Argument x = new Argument("x = 1");
Expression e = new Expression("if( x >= 1, 1, [NaN] )", x);
mXparser.consolePrintln("Res 1: x = " + x.getArgumentValue() + ", " + e.getExpressionString() + " = " + e.calculate());
x.setArgumentValue(0);
mXparser.consolePrintln("Res 2: x = " + x.getArgumentValue() + ", " + e.getExpressionString() + " = " + e.calculate());
[mXparser-v.5.0.0] Res 1: x = 1.0, if( x >= 1, 1, [NaN] ) = 1.0
[mXparser-v.5.0.0] Res 2: x = 0.0, if( x >= 1, 1, [NaN] ) = NaN

Case 3: First non-NaN valueon the list

import org.mariuszgromada.math.mxparser.*;
...
Argument x = new Argument("x = 1");
Expression e = new Expression("coalesce( 2/0 , x , 3)", x);
mXparser.consolePrintln("Res 1: x = " + x.getArgumentValue() + ", " + e.getExpressionString() + " = " + e.calculate());
x.setArgumentValue(Double.NaN);
mXparser.consolePrintln("Res 2: x = " + x.getArgumentValue() + ", " + e.getExpressionString() + " = " + e.calculate());
[mXparser-v.5.0.0] Res 1: x = 1.0, coalesce( 2/0 , x , 3) = 1.0
[mXparser-v.5.0.0] Res 2: x = NaN, coalesce( 2/0 , x , 3) = 3.0
Nuget
Install-Package MathParser.org-mXparser -Version 5.0.2
Maven
<dependency>
<groupid>org.mariuszgromada.math</groupid>
<artifactid>MathParser.org-mXparser</artifactid>
<version>5.0.2</version>
</dependency>
Gradle
implementation 'org.mariuszgromada.math:MathParser.org-mXparser:5.0.2'
Gradle (Kotlin)
implementation("org.mariuszgromada.math:MathParser.org-mXparser:5.0.2")
GitHub
git clone https://github.com/mariuszgromada/MathParser.org-mXparser
OTHER DOWNLOAD OPTIONS

Download latest release – v.5.0.2 Leonis: bin + docDownload latest release – v.5.0.2 Leonis: bin only, includes separate binaries for various .NET platforms and Java versions

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