Modern Math CIsNaN

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CIsNaN

Returns true if a complex number is NaN; one infinite part makes it infinite instead.

Syntax

CIsNaN( byref z as Complex ) as boolean

Notes

• This is not 'either component is NaN'. It is neither infinite nor finite, which is .NET's definition and the right one: a complex number with one infinite part and one NaN part is infinite, because the infinity already answers every question anyone asks of it.
• Never test for a NaN with =. A NaN is not equal to itself.

Examples

#import "std/numeric"
using numeric

print CIsNaN( CNaN( ) )                      '' true
print CIsNaN( CSet( Infinity( ), NaN( ) ) )  '' false   -- infinite, so NOT NaN
print CIsNaN( CSet( 1.0, NaN( ) ) )          '' true   -- this one is

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Library: Math Library
Category: Math Library
Documented under: Members