[R] Read data in sequences

Dieter Menne dieter.menne at menne-biomed.de
Fri Apr 9 18:04:02 CEST 2010

RockO wrote:
> I tried to find a solution in the search list, but I cannot find it. I
> would like to read a .txt file with, let say, three variables, with two of
> which have repeated values in a number a columns. 
> The variables: Treat, x1, x2.
> The values:
> A 2.5 3.4 2.7 5.6 5.7 5.4 10.1 9.4 ...
> B 5.3 5.4 6.5 7.5 1.3 4.5 10.5 4.1 ...
> ...
> In the first column, the letters represent the variable "Treat", and the
> sequence of numbers on a same line represent pairs of values for "x1" and
> "x2".

Looks like SAS is quite elegant here (don't kill me, I could not afford
using SAS, R has save my retirement fund).

I would first read it in "as usual", and do the reformatting later. 

wide = read.table("wideseq.txt",sep=" ")
# renames columns
names(wide) =  c("varname",rep(c("x1","x2"),ncol(wide)%/%2))

Now you have the long format, which is not exactly what you want, but
typically much more useful in R than the format you require. You might use
one of the function in package reshape to get your format.


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