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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 The R Development Core Team
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 *  Copyright (C) 2000	    The R Development Core Team
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 *  Copyright (C) 2003	    The R Foundation
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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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{
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{
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#ifdef IEEE_754
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#ifdef IEEE_754
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    if (ISNAN(x) || ISNAN(mu) || ISNAN(sigma))
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    if (ISNAN(x) || ISNAN(mu) || ISNAN(sigma))
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	return x + mu + sigma;
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	return x + mu + sigma;
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#endif
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#endif
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    if(!R_FINITE(sigma)) return R_D__0;
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    if(!R_FINITE(x) && mu == x) return ML_NAN;/* x-mu is NaN */
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    if (sigma <= 0) {
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    if (sigma <= 0) ML_ERR_return_NAN;
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	if (sigma < 0) ML_ERR_return_NAN;
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	/* sigma == 0 */
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	return (x == mu) ? ML_POSINF : R_D__0;
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    }
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    x = (x - mu) / sigma;
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    x = (x - mu) / sigma;
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    if(!R_FINITE(x)) return R_D__0;
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    return (give_log ?
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    return (give_log ?
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	    -(M_LN_SQRT_2PI  +	0.5 * x * x + log(sigma)) :
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	    -(M_LN_SQRT_2PI  +	0.5 * x * x + log(sigma)) :
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	    M_1_SQRT_2PI * exp(-0.5 * x * x)  /	  sigma);
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	    M_1_SQRT_2PI * exp(-0.5 * x * x)  /	  sigma);
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    /* M_1_SQRT_2PI = 1 / sqrt(2 * pi) */
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    /* M_1_SQRT_2PI = 1 / sqrt(2 * pi) */
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}
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}