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/*
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/*
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 *  Mathlib : A C Library of Special Functions
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 *  Mathlib : A C Library of Special Functions
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 *  Copyright (C) 1998 Ross Ihaka
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 *  Copyright (C) 1998 Ross Ihaka
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 *  Copyright (C) 2000-2001 The R Development Core Team
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 *  Copyright (C) 2000-2008 The R Development Core Team
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 *
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 *
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 *  This program is free software; you can redistribute it and/or modify
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 *  This program is free software; you can redistribute it and/or modify
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 *  it under the terms of the GNU General Public License as published by
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 *  it under the terms of the GNU General Public License as published by
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 *  the Free Software Foundation; either version 2 of the License, or
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 *  the Free Software Foundation; either version 2 of the License, or
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 *  (at your option) any later version.
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 *  (at your option) any later version.
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#include "nmath.h"
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#include "nmath.h"
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double rt(double df)
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double rt(double df)
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{
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{
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    double num;
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    if (ISNAN(df) || df <= 0.0)	ML_ERR_return_NAN;
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    if (ISNAN(df) || df <= 0.0)	ML_ERR_return_NAN;
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    if(!R_FINITE(df))
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    if(!R_FINITE(df))
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	return norm_rand();
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	return norm_rand();
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    else {
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    else {
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/* Some compilers (including MW6) evaluated this from right to left
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/* Some compilers (including MW6) evaluated this from right to left
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	return norm_rand() / sqrt(rchisq(df) / df); */
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	return norm_rand() / sqrt(rchisq(df) / df); */
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	num = norm_rand();
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	double num = norm_rand();
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	return num / sqrt(rchisq(df) / df);
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	return num / sqrt(rchisq(df) / df);
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    }
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    }
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}
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}