>>>>> "Morten" == Morten Welinder <[EMAIL PROTECTED]> >>>>> on Fri, 27 May 2005 20:24:36 +0200 (CEST) writes:

Morten> Full_Name: Morten Welinder Version: 2.1.0 OS: src Morten> only Submission from: (NULL) (216.223.241.212) Morten> Now that pcauchy has been fixed, it is becoming Morten> clear that qcauchy suffers from the same problems. Morten> Morten> qcauchy(pcauchy(1e100,0,1,FALSE,TRUE),0,1,FALSE,TRUE) Morten> should yield 1e100 back, but I get 1.633178e+16. Morten> The code below does much better. Notes: Morten> 1. p need not be finite. -Inf is ok in the log_p Morten> case and R_Q_P01_check already checks things. yes Morten> 2. No need to disallow scale=0 and infinite Morten> location. yes Morten> 3. The code below uses isnan and finite directly. Morten> It needs to be adapted to the R way of doing that. I've done this, and started testing the new code; a version will be put into the next version of R. Thank you for the suggestions. >> double >> qcauchy (double p, double location, double scale, int lower_tail, int log_p) >> { >> if (isnan(p) || isnan(location) || isnan(scale)) >> return p + location + scale; >> R_Q_P01_check(p); >> if (scale < 0 || !finite(scale)) ML_ERR_return_NAN; >> if (log_p) { >> if (p > -1) >> lower_tail = !lower_tail, p = -expm1 (p); >> else >> p = exp (p); >> } >> if (lower_tail) scale = -scale; >> return location + scale / tan(M_PI * p); >> } ______________________________________________ R-devel@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-devel