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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) 1998-2001 Ross Ihaka and the R Development Core team.
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 *  Copyright (C) 1998-2001 Ross Ihaka and the R Development Core team.
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 *  Copyright (C) 2002      The R Foundation
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 *  Copyright (C) 2002-3    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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double bessel_k(double x, double alpha, double expo)
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double bessel_k(double x, double alpha, double expo)
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{
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{
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    long nb, ncalc, ize;
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    long nb, ncalc, ize;
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    double *bk;
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    double *bk;
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#ifndef MATHLIB_STANDALONE
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    char *vmax;
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    char *vmax;
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#endif
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#ifdef IEEE_754
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#ifdef IEEE_754
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    /* NaNs propagated correctly */
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    /* NaNs propagated correctly */
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    if (ISNAN(x) || ISNAN(alpha)) return x + alpha;
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    if (ISNAN(x) || ISNAN(alpha)) return x + alpha;
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#endif
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#endif