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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) 2000-12    The R Core Team
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 *  Copyright (C) 2000--2016 The R Core Team
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 *  Copyright (C) 2004--2005 The R Foundation
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 *  Copyright (C) 2004--2016 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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#include "nmath.h"
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#include "nmath.h"
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#include "dpq.h"
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#include "dpq.h"
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double qgeom(double p, double prob, int lower_tail, int log_p)
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double qgeom(double p, double prob, int lower_tail, int log_p)
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{
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{
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    if (prob <= 0 || prob > 1) ML_ERR_return_NAN;
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    R_Q_P01_boundaries(p, 0, ML_POSINF);
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#ifdef IEEE_754
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#ifdef IEEE_754
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    if (ISNAN(p) || ISNAN(prob))
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    if (ISNAN(p) || ISNAN(prob))
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	return p + prob;
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	return p + prob;
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#endif
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#endif
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    if (prob <= 0 || prob > 1) ML_ERR_return_NAN;
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    R_Q_P01_check(p);
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    if (prob == 1) return(0);
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    if (prob == 1) return(0);
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    R_Q_P01_boundaries(p, 0, ML_POSINF);
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/* add a fuzz to ensure left continuity, but value must be >= 0 */
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/* add a fuzz to ensure left continuity, but value must be >= 0 */
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    return fmax2(0, ceil(R_DT_Clog(p) / log1p(- prob) - 1 - 1e-12));
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    return fmax2(0, ceil(R_DT_Clog(p) / log1p(- prob) - 1 - 1e-12));
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}
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}