[R] cancelling in fraction

[Greg Snow]

Here is a different approach that may work for you, or give you a starting place:

> library(MASS)
> fractions(60/(220*6))
[1] 1/22

Hope this helps,

-- 
Gregory (Greg) L. Snow Ph.D.
Statistical Data Center
Intermountain Healthcare
greg.snow at imail.org
801.408.8111


> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
> project.org] On Behalf Of capybara!
> Sent: Friday, April 23, 2010 7:49 AM
> To: r-help at r-project.org
> Subject: [R] cancelling in fraction
> 
> 
> Dear All,
> 
> I have a fraction of 60./(220.*6.), which equals 1./22.
> My question is how to cancel the fraction so I actually get 1/22
> (actually I
> just need the factor 22) using R. I tried it with prime factor
> decomposition
> from the package "schoolmath":
> 
> > require("schoolmath")
> Loading required package: schoolmath
> > nom <- prime.factor(60)
> > nom
> [1] 2 2 3 5
> > denom <- prime.factor(220 * 6)
> > denom
> [1]  2  2  2  3  5 11
> 
> So far so good, now I just need to take all elements which are in nom
> out of
> denom (if possible).
> For this I use the package "sets", its function set_complement should
> exactly do that, but:
> 
> > require(sets)
> > set_complement(nom, denom)
> {2, 2, 11}
> 
> It gives me {2,2,11} and 2 * 2 * 11 is 44 and not 22.
> What am I doing wrong? Can anybody help me?
> Is there maybe a more elegant way to cancel a fraction than by prime
> factor
> decomposition?
> 
> Many thanks in advance,
> 
> Hannes
> 
> 
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> in-fraction-tp2062218p2062218.html
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> 
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