On Nov 13, 2009, at 11:19 AM, soeren.vo...@eawag.ch wrote:
Hello
a <- c("Mama", "Papa", "Papa; Mama", "", "Sammy; Mama; Papa")
a <- strsplit(a, "; ")
mama <- rep(F, length(a))
mama[sapply(a, function(x) { sum(x=="Mama") }, simplify=T) > 0] <- T
papa <- rep(F, length(a))
papa[sapply(a, function(x) { sum(x=="Papa") }, simplify=T) > 0] <- T
# ... more variables
... produces the variables "mama" and "papa" correctly. But how do I
remove all "Mama" list entries in "a" in the same run, that is,
shrink the list by what was already matched?
Maybe you should explain what you were trying to do? Perhaps:
> a[!mama]
[[1]]
[1] "Papa"
[[2]]
character(0)
I would sidestep that confusing sequence of logical assignments and
just do this:
> a[ -grep("Mama", a) ]
[[1]]
[1] "Papa"
[[2]]
character(0)
--
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
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