[R] snow package

[Unger, Kristian, Dr.]

Prof Ripley

Thanks for your message - you are absolutely right. I should have provided
more information.

Meanwhile, I found out that loading an R workspace prevented parApply from
working properly. The workspace contains many objects and I could not
figure out which one was responsible for causing error. Obviously I had
given an object a name that is already used for a function required by
parApply.

Many thanks for your help - and apologies for not following the R posting
guidelines.

Best wishes

Kristian Unger




________________________________________
Dr. Kristian Unger


Arbeitsgruppenleiter Integrative Biologie / Head of Integrative Biology
Group
Abteilung für Strahlenzytogenetik / Research Unit of Radiation
Cytogenetics

Tel.: +49-89-3187-3515

Mob.: +49-160-90641879





Am 12.06.11 18:05 schrieb "Prof Brian Ripley" unter
<ripley at stats.ox.ac.uk>:

>On Sun, 12 Jun 2011, Unger, Kristian, Dr. wrote:
>
>> Hi
>>
>> I try parallelising some code using the snow package and the following
>>lines:
>>
>> cl <- makeSOCKcluster(8)
>> pfunc <- function (x) (if(x <= (-th)) 1 else 0) ###correlation
>>coefficient
>>
>> clusterExport(cl,c("pfunc","th"))
>> cor.c.f <- parApply(cl,tms,c(1,2),FUN=pfunc)
>>
>> The parApply results in the error message:
>>
>>> cor.c.f <- parApply(cl,tms,c(1,2),FUN=pfunc)
>> Error in do.call("fun", lapply(args, enquote)) :
>>  could not find function "fun".
>>
>> Any ideas?
>
>See the footer of this message: that example is not reproducible.
>What is 'th'?  What is 'tms'?
>
>With some plausible guesses for those this works for me.  The error
>message appears to be from snow's function docall(), but without even
>a traceback(), it is impossible to guess which call to docall() is
>involved.  This is why we ask for a reproducible example.
>
>You are also missing the 'at a minimum' information requested in the
>posting guide.
>
>>
>> Best wishes
>>
>> Kristian
>>
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>
>No HTML: seee the posting guide.
>
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>>
>
>--
>Brian D. Ripley,                  ripley at stats.ox.ac.uk
>Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
>University of Oxford,             Tel:  +44 1865 272861 (self)
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Helmholtz Zentrum München
Deutsches Forschungszentrum für Gesundheit und Umwelt (GmbH)
Ingolstädter Landstr. 1
85764 Neuherberg
www.helmholtz-muenchen.de
Aufsichtsratsvorsitzende: MinDir´in Bärbel Brumme-Bothe
Geschäftsführer: Prof. Dr. Günther Wess und Dr. Nikolaus Blum
Registergericht: Amtsgericht München HRB 6466
USt-IdNr: DE 129521671