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double bessel_i(double x, double alpha, double expo)
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double bessel_i(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 *bi;
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    double *bi;
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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