A further citation that answers the question I raised (and
inaccurately predicted no value) regarding prime.sieve :
http://finzi.psych.upenn.edu/R/Rhelp02/archive/49773.html
This was found with Barons search facility set for rhelp postings:
http://search.r-project.org/cgi-bin/namazu.cgi?query=factorize+prime&max=100&result=normal&sort=score&idxname=functions&idxname=Rhelp08&idxname=Rhelp10&idxname=Rhelp02
On Sep 21, 2010, at 4:22 PM, David Winsemius wrote:
On Sep 21, 2010, at 3:44 PM, Spencer Graves wrote:
Hello:
It's hard to RTFM if you don't know which FMTR. I only found
one with the "obvious search strategy" with my favorite search
tools, which may nevertheless be unfamiliar to Cliff Clive.
RSiteSearch('prime factorization') # produced 3 matches, the first
of which is the "primeFactors" function in the "surveillance"
package.
install.packages('sos') # if you don't already have it
library(sos)
pf <- findFn('prime factorization') # only 3 matches
pf # open the result in a web browser with a link to the
"primeFactors" function above.
DAVID: You say there are "At least two." How can I find the other
one?
With my second favorite search strategy (using sos's "???" function)
and "prime factors" I got schoolmath's prime.factor() and
conf.design's factorize()
(I had already gotten the same results at Baron's search page so I
conclude that it was pretty easy.)
Going to a slightly more general search, "prime factor", I also
found another factorize() in the elliptic package.
With ???"prime factor*" I got 147 hits but have not had the time to
thoroughly search through them to see if I can get any more.
(I do see another function, primesieve, in spuRs but it doesn't
appear to factorize.)
Stopping at one search strategy seems to severely limit the values
of a search engine.
--
David.
Thanks,
Spencer
On 9/21/2010 11:14 AM, David Winsemius wrote:
On Sep 21, 2010, at 11:33 AM, Cliff Clive wrote:
Hi everyone, I have a very quick question:
Is there a ready-made function in R or any R packages to find the
prime
factorization of an integer?
Yes. At least two. The obvious search strategy with your favrite
search tool should work well.
--
Spencer Graves, PE, PhD
President and Chief Operating Officer
Structure Inspection and Monitoring, Inc.
751 Emerson Ct.
San José, CA 95126
ph: 408-655-4567
David Winsemius, MD
West Hartford, CT
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David Winsemius, MD
West Hartford, CT
______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
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