[R] Case statements in R

[Henrik Bengtsson]

Use '&' for vectors and '&&' for scalars.  Ditto applies to the OR
operator(s).   /Henrik

On Mon, Jul 28, 2008 at 10:36 AM, Wade Wall <wade.wall at gmail.com> 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]]
>
> ______________________________________________
> R-help at r-project.org mailing list
> 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.
>