'\" t .\" Title: lgamma, lgamma_r .\" Author: The Khronos Group .\" Generator: DocBook XSL Stylesheets v1.79.1 .\" Date: 02/03/2019 .\" Manual: OpenCL Manual .\" Source: The Khronos Group .\" Language: English .\" .TH "LGAMMA, LGAMMA_R" "3clc" "02/03/2019" "The Khronos Group" "OpenCL Manual" .\" ----------------------------------------------------------------- .\" * Define some portability stuff .\" ----------------------------------------------------------------- .\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .\" http://bugs.debian.org/507673 .\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html .\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .ie \n(.g .ds Aq \(aq .el .ds Aq ' .\" ----------------------------------------------------------------- .\" * set default formatting .\" ----------------------------------------------------------------- .\" disable hyphenation .nh .\" disable justification (adjust text to left margin only) .ad l .\" ----------------------------------------------------------------- .\" * MAIN CONTENT STARTS HERE * .\" ----------------------------------------------------------------- .SH "NAME" lgamma,_lgamma_r \- Log gamma functions\&. .SH "" .HP \w'gentype\ lgamma('u .BI "gentype lgamma(gentype\ " "x" ");" .HP \w'floatn\ lgamma_r('u .BI "floatn lgamma_r(floatn\ " "x" ", __global\ intn\ *" "signp" ");" .HP \w'floatn\ lgamma_r('u .BI "floatn lgamma_r(floatn\ " "x" ", __local\ intn\ *" "signp" ");" .HP \w'floatn\ lgamma_r('u .BI "floatn lgamma_r(floatn\ " "x" ", __private\ intn\ *" "signp" ");" .HP \w'float\ lgamma_r('u .BI "float lgamma_r(float\ " "x" ", __global\ int\ *" "signp" ");" .HP \w'float\ lgamma_r('u .BI "float lgamma_r(float\ " "x" ", __local\ int\ *" "signp" ");" .HP \w'float\ lgamma_r('u .BI "float lgamma_r(float\ " "x" ", __private\ int\ *" "signp" ");" .HP \w'doublen\ lgamma_r('u .BI "doublen lgamma_r(doublen\ " "x" ", __global\ intn\ *" "signp" ");" .HP \w'doublen\ lgamma_r('u .BI "doublen lgamma_r(doublen\ " "x" ", __local\ intn\ *" "signp" ");" .HP \w'doublen\ lgamma_r('u .BI "doublen lgamma_r(doublen\ " "x" ", __private\ intn\ *" "signp" ");" .HP \w'double\ lgamma_r('u .BI "double lgamma_r(double\ " "x" ", __global\ int\ *" "signp" ");" .HP \w'double\ lgamma_r('u .BI "double lgamma_r(double\ " "x" ", __local\ int\ *" "signp" ");" .HP \w'double\ lgamma_r('u .BI "double lgamma_r(double\ " "x" ", __private\ int\ *" "signp" ");" .HP \w'halfn\ lgamma_r('u .BI "halfn lgamma_r(halfn\ " "x" ", __global\ intn\ *" "signp" ");" .HP \w'halfn\ lgamma_r('u .BI "halfn lgamma_r(halfn\ " "x" ", __local\ intn\ *" "signp" ");" .HP \w'halfn\ lgamma_r('u .BI "halfn lgamma_r(halfn\ " "x" ", __private\ intn\ *" "signp" ");" .HP \w'half\ lgamma_r('u .BI "half lgamma_r(half\ " "x" ", __global\ int\ *" "signp" ");" .HP \w'half\ lgamma_r('u .BI "half lgamma_r(half\ " "x" ", __local\ int\ *" "signp" ");" .HP \w'half\ lgamma_r('u .BI "half lgamma_r(half\ " "x" ", __private\ int\ *" "signp" ");" .SH "DESCRIPTION" .PP Returns the natural logarithm of the absolute value of the gamma function\&. The sign of the gamma function is returned in the \fIsignp\fR argument of the \fBlgamma_r\fR\&. .PP An application that wants to use \fBhalf\fR and \fBhalf\fR\fB\fIn\fR\fR types will need to include the #pragma OPENCL EXTENSION \fBcl_khr_fp16\fR(3clc) : enable directive\&. If extended with \fBcl_khr_fp16\fR(3clc), generic type name \fBgentype\fR also includes \fBhalf\fR and \fBhalf{2|3|4|8|16}\fR\&. .SH "NOTES" .PP The vector versions of the math functions operate component\-wise\&. The description is per\-component\&. .PP 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\&. .PP 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\&. .PP The generic type name \fBgentype\fR is used to indicate that the function can take \fBfloat\fR, \fBfloat2\fR, \fBfloat3\fR, \fBfloat4\fR, \fBfloat8\fR, \fBfloat16\fR, \fBdouble\fR, \fBdouble2\fR, \fBdouble3\fR, \fBdouble4\fR, \fBdouble8\fR, or \fBdouble16\fR as the type for the arguments\&. .PP If extended with \fBcl_khr_fp16\fR(3clc), generic type name \fBgentype\fR may indicate \fBhalf\fR and \fBhalf{2|3|4|8|16}\fR as arguments and return values\&. .PP The generic type name \fBgentypef\fR is used to indicate that the function can take \fBfloat\fR, \fBfloat2\fR, \fBfloat3\fR, \fBfloat4\fR, \fBfloat8\fR, or \fBfloat16\fR as the type for the arguments\&. .PP The generic type name \fBgentyped\fR is used to indicate that the function can take \fBdouble\fR, \fBdouble2\fR, \fBdouble3\fR, \fBdouble4\fR, \fBdouble8\fR, or \fBdouble16\fR as the type for the arguments\&. .SH "SPECIFICATION" .PP \m[blue]\fBOpenCL Specification\fR\m[]\&\s-2\u[1]\d\s+2 .SH "SEE ALSO" .PP \fBmathFunctions\fR(3clc) .SH "AUTHORS" .PP \fBThe Khronos Group\fR .SH "COPYRIGHT" .br Copyright \(co 2007-2011 The Khronos Group Inc. .br 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. .sp .SH "NOTES" .IP " 1." 4 OpenCL Specification .RS 4 \%page 244, section 6.12.2 - Math Functions .RE