dx-graphics-hlsl-isnan.md

title	description	ms.assetid	keywords	topic_type	api_name	api_location	api_type	ms.topic	ms.date
isnan (Corecrt\_math.h)	Determines if the specified value is NAN or QNAN.	09085634-e610-4793-848e-abda8241f1cc	isnan HLSL	apiref	isnan	corecrt_math.h	HeaderDef	reference	05/31/2018

isnan

Determines if the specified value is NAN or QNAN.

ret isnan(x)

Parameters

Item	Description
x	[in] The specified value.

Return Value

Returns a value of the same size as the input, with a value set to True if the x parameter is NAN or QNAN. Otherwise, False.

Type Description

Name	Template Type	Component Type	Size
x	scalar, vector, or matrix	float	any
ret	scalar, vector, or matrix	bool	as input

Minimum Shader Model

This function is supported in the following shader models.

Shader Model	Supported
Shader Model 2 (DirectX HLSL) and higher shader models	yes
Shader Model 1 (DirectX HLSL)	yes (vs_1_1 only)

Requirements

Requirement	Value
Header	Corecrt_math.h

See also

Intrinsic Functions (DirectX HLSL)