[R] read.table input array
Balpo
balpo at gmx.net
Sat Oct 23 05:36:32 CEST 2010
Thanx Jorge,
while doing it exactly as you say, it does work, but I need to read the
information form a file.
When I read it from the file it still shows 780.
On 22/10/10 21:30, Jorge Ivan Velez wrote:
> Hi Balpo,
>
> Try this:
>
> # data
>
> x<- read.table(textConnection("ktot attractors pctstatesinattractors t
> lengths
>
> 1.02.03.8146973E-417c(2,2)
>
> 1.01.05.722046E-428c(2)
>
> 1.02.09.536743E-418c(2,2)
>
> 1.01.00.001049041714c(1)"), header = TRUE)
>
> closeAllConnections()
>
>
> # function to do the parse()ing
>
> foo<- function(x) eval(parse(text=x))
>
>
> # processing
>
> x$mymean<- sapply(with(x, sapply(lengths, foo)), mean, na.rm = TRUE)
>
> x
>
>
> HTH,
> Jorge
>
>
> On Fri, Oct 22, 2010 at 10:19 PM, Balpo <> wrote:
>
> Hello again Jim (and everyone)
> I am having a weird problem here with the same parsing thing.
> For example, for the first row I have the following 5 columns.
>
> 1.0 2.0 3.8146973E-4 17 c(2,2)
>
> I need to convert that c(2,2) into a list and get its mean, in
> this particular case mean=2. My program does:
>
> t1 <- read.table(file="file.dat", header=T,
> colClasses=c("numeric", "numeric", "numeric", "numeric", "factor"))
> t1$lengthz <- lapply(t1$lengths, function(a)
> eval(parse(text=a)))#As Jim thought me
> t1$avglen <- as.vector(mode="numeric", lapply(t1$lengthz,
> function(i) mean(i)))
>
> but the 6th column is strangely getting 780 instead of 2.
> This solution used to work! :-(
> Do you have any idea about what is going on?
>
> I attach file.dat.
>
> Thank you for your support.
>
> Balpo
>
>
> On 19/07/10 16:38, Balpo wrote:
>
> Thank you a lot, Jim.
> Issue solved.
>
> Balpo
>
> On 16/07/10 11:27, jim holtman wrote:
>
> Here is a way of creating a separate list of variable
> length vectors
> that you can use in your processing:
>
> # read into a dataframe
> x<- read.table(textConnection("A B C T Lengths
>
> + 1 4.0 0.0015258789 18 c(1,2,3)
> + 1 4.0 0.0015258789 18 c(1,2,6,7,8,3)
> + 1 4.0 0.0015258789 18 c(1,2,3,1,2,3,4,5,6,7,9)
> + 1 4.0 0.0015258789 18 c(1,2,3)
> + 1 1.0 0.0017166138 24 c(1,1,4)"), header=TRUE)
>
> # create a 'list' with the variable length vectors
> # assuming the the "Lengths" are legal R expressions
> using 'c'
> x$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<> 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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>
> ______________________________________________
> R-help at r-project.org <mailto:R-help at r-project.org> mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
>
> ______________________________________________
> R-help at r-project.org <mailto:R-help at r-project.org> mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
>
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