[R] use grep in lists and vectors

[arun]

Hi,
May be this helps:
mapply(grep,'^Ab$',test.list)
#or
lapply(test.list,function(x) grep("^Ab$",x))
A.K.






On Sunday, January 12, 2014 9:31 PM, Hermann Norpois <hnorpois at gmail.com> wrote:
Hello,

I want to detect Ab not Abc. For a normal vector
test
[1] "A"   "Ab"  "GG"  "GA"  "H"   "Abc" "Gz"  "HU"

> grep ("^Ab$", test)
[1] 2

works well.

For
test.list
[[1]]
[1] "A"  "Ab" "GG" "GA"

[[2]]
[1] "H"   "Abc" "Gz"  "HU"

grep ("^Ab$", test.list)
integer(0)

doest not work.

Why?
How do I detect exclusively Ab in a list context?
Thanks hermann


> dput (test.list)
list(c("A", "Ab", "GG", "GA"), c("H", "Abc", "Gz", "HU"))


> dput (test)
c("A", "Ab", "GG", "GA", "H", "Abc", "Gz", "HU")

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