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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) 2000-2002 The R Core Team
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 *  Copyright (C) 2000-2015 The R 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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    if(shape <= 0 || scale <= 0) ML_ERR_return_NAN;
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    if(shape <= 0 || scale <= 0) ML_ERR_return_NAN;
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    if (x <= 0)
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    if (x <= 0)
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	return R_DT_0;
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	return R_DT_0;
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    x = -pow(x / scale, shape);
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    x = -pow(x / scale, shape);
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    if (lower_tail)
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    return lower_tail
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	return (log_p
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		/* log(1 - exp(x))  for x < 0 : */
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		? R_Log1_Exp(x) : -expm1(x));
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	? (log_p ? R_Log1_Exp(x) : -expm1(x))
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    /* else:  !lower_tail */
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    return R_D_exp(x);
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	: R_D_exp(x);
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}
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}