ls is a list of character vectors created by strsplit()
I want to concatenate the 1st 4 character elements of each list item as a new
vector called file. I admit to being confused about list syntax even after
numerous readings.
Here's what I tried:
ls <- list(c("Focused", "10k", "A12", "t04.tif", "+", "µm"), c("Focused",
"10k", "A12", "t08.tif", "+", "µm"), c("Focused", "10k", "A12",
"t12.tif", "+", "µm"), c("Focused", "10k", "A12", "t16.tif",
"+", "µm"), c("Focused", "10k", "A12", "t20.tif", "+", "µm"),
c("Focused", "10k", "A12", "t24.tif", "+", "µm"), c("Focused",
"10k", "A12", "t36.tif", "+", "µm"), c("Focused", "10k",
"A12", "t48.tif", "+", "µm"), c("Focused", "10k", "B12",
"t04.tif", "+", "µm"), c("Focused", "10k", "B12", "t08.tif",
"+", "µm"))
# Test the waters with one element
cat(unlist(ls[1])[1:4]) # WHY DOES THE COMMAND PROMPT NOT APPEAR ON NEXT
LINE AS USUAL???
# Appears to work except for command prompt glitch
# Attempts to use tapply() don't get me anywhere
file <- tapply(unlist(ls), list(1:length(unlist(ls))), cat(unlist(ls[1])[1:4]))
I'm grateful for an approach to putting my vector together, but I'd also love
to understand the headache I've apparently given the command parser. I'm
apparently doing some "no no".
Thanks,
Rob
> R.Version()
$platform
[1] "i386-pc-mingw32"
$arch
[1] "i386"
$os
[1] "mingw32"
$system
[1] "i386, mingw32"
$status
[1] ""
$major
[1] "2"
$minor
[1] "12.1"
$year
[1] "2010"
$month
[1] "12"
$day
[1] "16"
$`svn rev`
[1] "53855"
$language
[1] "R"
$version.string
[1] "R version 2.12.1 (2010-12-16)"
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