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 MODF(3clc) OpenCL Manual MODF(3clc)

# NAME¶

modf - Decompose a floating-point number.

# ¶

gentype modf(gentype x, __global gentype *iptr);
gentype modf(gentype x, __local gentype *iptr);
gentype modf(gentype x, __private gentype *iptr);

# DESCRIPTION¶

Decompose a floating-point number. The modf function breaks the argument x into integral and fractional parts, each of which has the same sign as the argument. It stores the integral part in the object pointed to by iptr.

# NOTES¶

modf behaves as though implemented by:
```gentype  modf ( gentype value, gentype *iptr )
{
*iptr = trunc(3clc)( value );
return  copysign(3clc)( isinf(3clc)( value ) ? 0.0 : value -  *iptr, value );
}
```
The vector versions of the math functions operate component-wise. The description is per-component.
The built-in math functions are not affected by the prevailing rounding mode in the calling environment, and always return the same value as they would if called with the round to nearest even rounding mode.
The built-in math functions take scalar or vector arguments. For any specific use of these function, the actual type has to be the same for all arguments and the return type unless otherwise specified.
The generic type name gentype is used to indicate that the function can take float, float2, float3, float4, float8, float16, double, double2, double3, double4, double8, or double16 as the type for the arguments.
If extended with cl_khr_fp16(3clc), generic type name gentype may indicate half and half{2|3|4|8|16} as arguments and return values.
The generic type name gentypef is used to indicate that the function can take float, float2, float3, float4, float8, or float16 as the type for the arguments.
The generic type name gentyped is used to indicate that the function can take double, double2, double3, double4, double8, or double16 as the type for the arguments.

# SPECIFICATION¶

OpenCL Specification[1]

# SEE ALSO¶

mathFunctions(3clc)

# AUTHORS¶

The Khronos Group Copyright © 2007-2011 The Khronos Group Inc.

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and/or associated documentation files (the "Materials"), to deal in the Materials without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Materials, and to permit persons to whom the Materials are furnished to do so, subject to the condition that this copyright notice and permission notice shall be included in all copies or substantial portions of the Materials.

# NOTES¶

1.
OpenCL Specification
page 244, section 6.12.2 - Math Functions
 06/18/2014 The Khronos Group