[R] Is this a bug of pweibull()?

[John Fox]

Dear Martin,

I get the same output as Joseph:

     > pweibull(3:10, 2)
     [1] 0.9998766 0.9999999 1.0000000 1.0000000       NaN       NaN       NaN
     [8]       NaN
     Warning message:
     NaNs produced in: pweibull(q, shape, scale, lower.tail, log.p)
     > pweibull(3:10, 2.1)
     [1] 0.9999566 1.0000000 1.0000000       NaN       NaN       NaN       NaN
     [8]       NaN
     Warning message:
     NaNs produced in: pweibull(q, shape, scale, lower.tail, log.p)

Verison information (using Windows 2000):

     platform i386-pc-mingw32
     arch     i386
     os       mingw32
     system   i386, mingw32
     status
     major    1
     minor    5.0
     year     2002
     month    04
     day      29
     language R

John


At 11:22 AM 5/11/2002 +0200, Martin Maechler wrote:
> >>>>> "Lu" == Lu Chi-Hsien Joseph <cjlu at ibm.stat.ncku.edu.tw> writes:
>
>     Lu> In rw1050, I found that
>     >> pweibull(3:10, 2)
>     Lu> [1] 0.9998766 0.9999999 1.0000000 1.0000000       NaN       NaN
>     Lu> [7]       NaN       NaN
>     Lu> Warning message:
>     Lu> NaNs produced in: pweibull(q, shape, scale, lower.tail, log.p)
>
>     Lu> more surprisingly,
>     >> pweibull(3:10, 2.1)
>     Lu> [1] 0.9999566 1.0000000 1.0000000      -Inf       NaN       NaN
>     Lu> [7]       NaN       NaN
>     Lu> Warning message:
>     Lu> NaNs produced in: pweibull(q, shape, scale, lower.tail, log.p)
>
>     Lu> Is this a bug of pweibull() in rw1050?
>
>Probably a problem with Windows / Math library behavior.
>The above example works fine in three different Unix versions I
>have access to (on Saturday morning).
>
>Can others, particularly Windows users, check this?
>
>Thanks,
>Martin Maechler
>
>     >> version
>     Lu> _
>     Lu> platform i386-pc-mingw32
>     Lu> arch     i386
>     Lu> os       mingw32
>     Lu> system   i386, mingw32
>     Lu> status
>     Lu> major    1
>     Lu> minor    5.0
>     Lu> year     2002
>     Lu> month    04
>     Lu> day      29
>     Lu> language R
>
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-----------------------------------------------------
John Fox
Department of Sociology
McMaster University
Hamilton, Ontario, Canada L8S 4M4
email: jfox at mcmaster.ca
phone: 905-525-9140x23604
web: www.socsci.mcmaster.ca/jfox
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