From p.dalgaard@biostat.ku.dk  Tue Feb 15 11:34:52 2000
From: p.dalgaard@biostat.ku.dk (Peter Dalgaard BSA)
Date: 15 Feb 2000 12:34:52 +0100
Subject: [Rd] rpois gives a large number repeatedly (PR#439)
In-Reply-To: kjetikj@astro.uio.no's message of "Tue, 15 Feb 2000 12:18:30 +0100 (MET)"
References: <200002151118.MAA04594@pubhealth.ku.dk>
Message-ID: <x24sban1gj.fsf@blueberry.kubism.ku.dk>

kjetikj@astro.uio.no writes:

> Full_Name: Kjetil Kjernsmo
> Version: 0.65.1
           !!!!!!
> OS: Digital UNIX 4.0
> Submission from: (NULL) (129.240.28.172)
> 

> ncloudsbin <- function(binno, ntotalclouds, numberofbins = 100, linewidth =
> numberofbins / 6)
>   return(ntotalclouds * dnorm(binno, sd = linewidth))
> 
> photonsincidenttodetectorbin <- function(binno, ntotalclouds,
> avgphotonfromcloud, ampmode = 1, ampmean = 2, numberofbins = 100, linewidth =
> numberofbins / 6)
> {
>   sc <- ampmean - ampmode
>   if(sc <= 0) stop("Mean Amplification must be greater than Mode Amplification")
> 
>   ncb <- ncloudsbin(binno, ntotalclouds, numberofbins, linewidth)
>   rg <- rgamma(ncb, ampmean / sc, sc)
>   rp <- rpois(ncb, avgphotonfromcloud)
>   dr <- rg * rp
>   if(sum(dr) > 25000) print(cbind(rg, rp, dr, avgphotonfromcloud, ncb))
>   return(sum(dr))
> }
> 

I can't seem to generate anything unusual with the latest R snapshot.
Perhaps it would help if you told us what parameters to call
photonsincidenttodetectorbin with?

-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard@biostat.ku.dk)             FAX: (+45) 35327907
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[Rd] rpois gives a large number repeatedly (PR#439)
Peter Dalgaard BSA