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Rev 80271 Rev 86507
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    if(p == R_DT_1) return ML_POSINF;
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    if(p == R_DT_1) return ML_POSINF;
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    double
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    double
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	mu = lambda,
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	mu = lambda,
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	sigma = sqrt(lambda),
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	sigma = sqrt(lambda),
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	// had gamma = sigma; PR#8058 should be kurtosis which is mu^-0.5 = 1/sigma
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	// had gamma = sigma; PR#8058 should be skewness which is mu^-0.5 = 1/sigma
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	gamma = 1.0/sigma;
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	gamma = 1.0/sigma;
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     R_DBG_printf("qpois(p=%.12g, lambda=%.15g, l.t.=%d, log=%d):"
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     R_DBG_printf("qpois(p=%.12g, lambda=%.15g, l.t.=%d, log=%d):"
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		  " mu=%g, sigma=%g, gamma=%g;\n",
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		  " mu=%g, sigma=%g, gamma=%g;\n",
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		  p, lambda, lower_tail, log_p, mu, sigma, gamma);
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		  p, lambda, lower_tail, log_p, mu, sigma, gamma);