Here is a way of creating a separate list of variable length vectors
that you can use in your processing:
# read into a dataframe
x<- read.table(textConnection("A B C T Lengths
+ 1 4.0 0.0015258789 18 c(1,2,3)
+ 1 4.0 0.0015258789 18 c(1,2,6,7,8,3)
+ 1 4.0 0.0015258789 18 c(1,2,3,1,2,3,4,5,6,7,9)
+ 1 4.0 0.0015258789 18 c(1,2,3)
+ 1 1.0 0.0017166138 24 c(1,1,4)"), header=TRUE)
# create a 'list' with the variable length vectors
# assuming the the "Lengths" are legal R expressions using 'c'
x$varList<- lapply(x$Lengths, function(a) eval(parse(text=a)))
x
A B C T
Lengths varList
1 1 4 0.001525879 18 c(1,2,3)
1, 2, 3
2 1 4 0.001525879 18 c(1,2,6,7,8,3) 1, 2, 6,
7, 8, 3
3 1 4 0.001525879 18 c(1,2,3,1,2,3,4,5,6,7,9) 1, 2, 3, 1, 2, 3, 4, 5,
6, 7, 9
4 1 4 0.001525879 18 c(1,2,3)
1, 2, 3
5 1 1 0.001716614 24 c(1,1,4)
1, 1, 4
str(x)
'data.frame': 5 obs. of 6 variables:
$ A : int 1 1 1 1 1
$ B : num 4 4 4 4 1
$ C : num 0.00153 0.00153 0.00153 0.00153 0.00172
$ T : int 18 18 18 18 24
$ Lengths: Factor w/ 4 levels "c(1,1,4)","c(1,2,3)",..: 2 4 3 2 1
$ varList:List of 5
..$ : num 1 2 3
..$ : num 1 2 6 7 8 3
..$ : num 1 2 3 1 2 3 4 5 6 7 ...
..$ : num 1 2 3
..$ : num 1 1 4
On Fri, Jul 16, 2010 at 10:51 AM, Balpo<ba...@gmx.net> wrote:
Hello to all!
I am new with R and I need your help.
I'm trying to read a file which contests are similar to this:
A B C T Lengths
1 4.0 0.0015258789 18 c(1,2,3)
1 1.0 0.0017166138 24 c(1,1,4)
So all the columns are numeric values, except Lengths, which is
supposed to
be an variable length array of integers.
How can I make R read them as arrays of integers? Or otherwise,
convert the
character array to an array of integers.
When I read the file, I do it like this
t1 = read.table(file=paste("./borrar.dat",sep=""), header=T,
colClasses=c("numeric", "numeric", "numeric", "numeric", "array"))
But the 5th column is treated as an array of characters, and when
trying to
convert it to another class of data, I either
get two strings "c(1,2,3)" and "c(1,1,4)" or using a toRaw
converter, I get
the corresponding ASCII ¿? values.
Should the input be modified in order to be able to read it as an
array of
integers?
Thank you for your help.
Balpo
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