[R] Case statements in R

From: Wade Wall <wade.wall_at_gmail.com>
Date: Mon, 28 Jul 2008 13:36:37 -0400


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

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