Message-ID: <49F6FD10.30805@statistik.tu-dortmund.de>
Date: 2009-04-28T12:56:48Z
From: Uwe Ligges
Subject: problem with Power function on a power my result is "inf"
In-Reply-To: <029e01c9c766$0a33d350$1e9b79f0$@montaghi@unifi.it>
Alessandro wrote:
> Dear user,
>
>
>
> I have a problem with a power because after a value the result is "inf"
>
>
>
>
>
> Mydata <- data.frame(plot=c(11,12,13,14,15, 16, 21, 22, 23, 24, 25, 26,
> 31, 32,33, 34),
>
> SumH=c(17573.029,22572.162,19659.984,13952.781,6996.924,16049.598,13869.409,
> 8284.981,7752.961,18901.742,11078.659,33692.330,44456.277,18737.265,21623.89
> 8,15837.077))
>
>
>
> # USE a power from 1 to 10 by 0.1
>
> power <- seq(1.0, 10.0, by=0.1)
>
>
>
> for (method in 1:length(power)){
>
>
>
> Mydata$power <- paste(Mydata$SumH^method)
>
> write.matrix(Mydata, paste(file =
> "C:/SNAMP_fns/GSmodel/mydata","_",method+9,".txt", sep=""), sep = "\t")
>
>
>
> }
>
>
>
> On 57 power some value strart to be "inf". All "inf" in power of 10. Is It a
> limit of memory or another problem?
Do you mean
Mydata$SumH^method
or
Mydata$SumH^(power[method])
?
If the latter, you won't see Inf as early as before.
The limit is the representation of floating point numbers. See ?.Machine
on how to learn about the limits of your version of R / platform.
Uwe Ligges
>
>
> Eventually is there a possibility to correct? Or I need to use a seq from 1
> to 5 or less?
>
>
>
> Thanks Ale
>
>
> [[alternative HTML version deleted]]
>
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