Re: [R] Subsetting depth profiles based on maximum depth by group with plyr

On 2011-05-16 17:14, Sam Albers wrote: Hello, Apologies for a similar earlier post. I didn't include enough details in that one. I am having a little trouble subsetting some data based on a grouping variable. I am using an instrument that does depth profiles of a water column. The instrument re

[R] Subsetting depth profiles based on maximum depth by group with plyr

Hello, Apologies for a similar earlier post. I didn't include enough details in that one. I am having a little trouble subsetting some data based on a grouping variable. I am using an instrument that does depth profiles of a water column. The instrument records on the way down as well as the way

[R] Subsetting depth profiles based on maximum depth

Hello, I am having a little trouble finding the right set of criteria to subset a portion of data. I am using an instrument that does depth profiles of a water column. The instrument records on the way down as well as the way up. ## So I am left with data like this: dat <- data.frame(var = runif