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// -*- mode: C++; c-indent-level: 4; c-basic-offset: 4; indent-tabs-mode: nil; -*-
//
// logis.h: Rcpp R/C++ interface class library --
//
// Copyright (C) 2010 - 2016 Douglas Bates, Dirk Eddelbuettel and Romain Francois
//
// This file is part of Rcpp.
//
// Rcpp is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 2 of the License, or
// (at your option) any later version.
//
// Rcpp is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Rcpp. If not, see <http://www.gnu.org/licenses/>.
#ifndef Rcpp__stats__logis_h
#define Rcpp__stats__logis_h
namespace Rcpp{
namespace stats{
inline double dlogis_0(double x /*, double location [=0.0], double scale [=1.0] */, int give_log){
double e, f;
#ifdef IEEE_754
if (ISNAN(x))
return x + 1.0;
#endif
e = ::exp(-::fabs(x));
f = 1.0 + e;
return give_log ? -(x + ::log(f * f)) : e / (f * f);
}
inline double dlogis_1(double x, double location /*, double scale [=1.0] */, int give_log){
double e, f;
#ifdef IEEE_754
if (ISNAN(x) || ISNAN(location))
return x + location + 1.0;
#endif
x = ::fabs((x - location));
e = ::exp(-x);
f = 1.0 + e;
return give_log ? -(x + ::log(f * f)) : e / (f * f);
}
inline double plogis_0(double x /*, double location [=0.0] , double scale [=1.0] */,
int lower_tail, int log_p) {
#ifdef IEEE_754
if (ISNAN(x))
return x + 1.0;
#endif
if (ISNAN(x)) return R_NaN;
R_P_bounds_Inf_01(x);
x = ::exp(lower_tail ? -x : x);
return (log_p ? -::log1p(x) : 1 / (1 + x));
}
inline double plogis_1(double x, double location /*, double scale [=1.0] */,
int lower_tail, int log_p) {
#ifdef IEEE_754
if (ISNAN(x) || ISNAN(location))
return x + location + 1.0;
#endif
x = (x - location);
if (ISNAN(x)) return R_NaN;
R_P_bounds_Inf_01(x);
x = ::exp(lower_tail ? -x : x);
return (log_p ? -::log1p(x) : 1 / (1 + x));
}
inline double qlogis_0(double p /*, double location [=0.0], double scale [=1.0] */,
int lower_tail, int log_p) {
#ifdef IEEE_754
if (ISNAN(p))
return p + 1.0;
#endif
R_Q_P01_boundaries(p, ML_NEGINF, ML_POSINF);
/* p := logit(p) = log(p / (1. - p)) : */
if (log_p) {
if (lower_tail)
p = p - ::log1p(- ::exp(p));
else
p = ::log1p(- ::exp(p)) - p;
}
else
p = ::log(lower_tail ? (p / (1. - p)) : ((1. - p) / p));
return p;
}
inline double qlogis_1(double p, double location /*, double scale [=1.0] */,
int lower_tail, int log_p) {
#ifdef IEEE_754
if (ISNAN(p) || ISNAN(location))
return p + location + 1.0;
#endif
R_Q_P01_boundaries(p, ML_NEGINF, ML_POSINF);
/* p := logit(p) = log(p / (1. - p)) : */
if (log_p) {
if (lower_tail)
p = p - ::log1p(- ::exp(p));
else
p = ::log1p(- ::exp(p)) - p;
}
else
p = ::log(lower_tail ? (p / (1. - p)) : ((1. - p) / p));
return location + p;
}
}
}
RCPP_DPQ_0(logis,Rcpp::stats::dlogis_0,Rcpp::stats::plogis_0,Rcpp::stats::qlogis_0)
RCPP_DPQ_1(logis,Rcpp::stats::dlogis_1,Rcpp::stats::plogis_1,Rcpp::stats::qlogis_1)
RCPP_DPQ_2(logis,::Rf_dlogis,::Rf_plogis,::Rf_qlogis)
#endif
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