Re: [R] Case statements in R

From: Roland Rau <roland.rproject_at_gmail.com>
Date: Mon, 28 Jul 2008 14:01:21 -0400

Hi,

maybe the following code helps to achieve what you want? It seems to me it is basically a 'recode' question.

set.seed(1234) # not neccessary but this ensures we have the same #results
random.values <- runif(n=30, min=0, max=100) newgrouping <- cut(x=random.values, breaks=c(0,0.1, 1, 2, 5, 10, 25, 50, 75, 95, 100), labels=1:10)
cbind(random.values,newgrouping)

## should result in:

       random.values newgrouping
  [1,]    11.3703411           6
  [2,]    62.2299405           8
  [3,]    60.9274733           8
  [4,]    62.3379442           8
  [5,]    86.0915384           9
  [6,]    64.0310605           8
  [7,]     0.9495756           2
  [8,]    23.2550506           6
  [9,]    66.6083758           8
[10,]    51.4251141           8
[11,]    69.3591292           8
[12,]    54.4974836           8
[13,]    28.2733584           7
[14,]    92.3433484           9

etc.

I hope this helps,
Roland

Wade Wall wrote:
> Hi all,
>
> I am trying to convert geometric means in a matrix to cover classes. My
> values are as such:
>
> perc<-c(0,0.025136418, 0.316227766, 1.414213562,3.16227766, 7.071067812,
> 15.8113883, 35.35533906, 61.23724357, 84.40971508, 97.46794345)
> cover<-c(0,1,2,3,4,5,6,7,8,9,10)
>
> This is what I am trying to accomplish
>
> veg_mean[veg_mean>0 && veg_mean < .1] <- 1
> veg_mean[veg_mean>= .1 && veg_mean < 1.0] <- 2
> veg_mean[veg_mean>=1.0 && veg_mean < 2.0] <- 3
> veg_mean[veg_mean>=2.0 && veg_mean < 5.0] <- 4
> veg_mean[veg_mean>= 5.0 && veg_mean < 10.0] <- 5
> veg_mean[veg_mean>= 10.0 && veg_mean < 25] <- 6
> veg_mean[veg_mean>= 25.0 && veg_mean < 50.0] <- 7
> veg_mean[veg_mean>=50.0 && veg_mean < 75.0] <- 8
> veg_mean[veg_mean>= 75.0 && veg_mean < 95.0 ] <- 9
> veg_mean[veg_mean>= 95.0 && veg_mean <= 100] <- 10
> veg_mean[veg_mean> 100] <- NA
>
> where values are assigned based on the geometric means. However, I think
> that my syntax for the && operator is wrong and I can't find a reference to
> proper syntax. I basically want to "bin" the geometric means.
>
> Any help would be greatly appreciated.
>
> Thanks,
>
> Wade
>
> [[alternative HTML version deleted]]
>
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>



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https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Received on Mon 28 Jul 2008 - 18:07:28 GMT

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