on 07/04/2008 09:38 AM jimineep wrote:
Is there a way of reading in a file in a way that each line becomes a vector:
for example:
meals.txt
breakfast bacon eggs sausage
lunch sandwich apple marsbar crisps
dinner chicken rice custard pie
I want to read in this file and end up with 3 different vectors, one called
breakfast which contains "bacon", "eggs", sausage" One called lunch with
"sandwich", "apple"... etc
So is there a way to do this with a file like this?
Or would I need to transpose the file using something like Perl? And since
the vectors are not all of equal length, would I have to also increase the
size of the shorter lines by adding NAs? I'm working with a file much bigger
than this and this could be a bit of a bother...
Kind Regards,
Jim
First, read in the data file using:
Lines <- readLines("meals.txt")
That gives you:
> Lines
[1] "breakfast bacon eggs sausage"
[2] "lunch sandwich apple marsbar crisps"
[3] "dinner chicken rice custard pie"
Note the current object list:
> ls()
[1] "DF" "Lines"
# Now loop over each line, split it
# then take the first value and use assign()
# to create a vector with that name, containing
# the remaining elements
for (i in seq(along = Lines)) {
Vec <- unlist(strsplit(Lines[i], " +"))
assign(Vec[1], Vec[-1])
}
Note the current object list:
> ls()
[1] "breakfast" "DF" "dinner" "i" "Lines"
[6] "lunch" "Vec"
> breakfast
[1] "bacon" "eggs" "sausage"
> lunch
[1] "sandwich" "apple" "marsbar" "crisps"
> dinner
[1] "chicken" "rice" "custard" "pie"
HTH,
Marc Schwartz
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