On 14.12.2011 23:11, Trying To learn again wrote:
Hi all,
I have solved my question
Output<- matrix(0, length(x), 1)
for (i in 1:length(x)){
files<- paste('KT', i, '.csv', sep = '')
da1<- read.csv(files)
Output[i,1]<-da1[1,2]
}
2 comments:
1: use seq:_along(x) rather than 1:length(x) to protect against length 0
objects.
2: use list.files(pattern="^KT.*\\.csv$") to get all the files you were
looking for from the current directory, hence no need to construct the
filenames.
That way it is probably a one-liner (untested):
Output <- sapply(list.files(pattern="^KT.*\\.csv$"), function(x)
read.csv(x)[1,2])
Uwe Ligges
2011/12/14 Trying To learn again<tryingtolearnag...@gmail.com>
Hi all,
I have 100 csv files always with this information (I Attach two example
excels)
KT80.csv contains:
,"x"
1,127.188271604938
KT80.csv contains
,"x"
1,1.06329287351545
I have three questions:
First
When I created this input files I used write.csv and it authomaticaly
creates the structure of the file as you can see.
Second. If I try to read csv it appears:
read.csv(KT2.csv,header=T, sep='.')
Error en read.table(file = file, header = header, sep = sep, quote =
quote, :
objeto 'KT2.csv' no encontrado
But the file is in the right directy....
Third (supossing I can solve the format files)
My main question is:
I want to create a matrix (or data frame) for instance from file KT80.csv
to KT81.csv so that the rows are without header and position.
127.18
1.06
Wich function would help me?
I think I should use something like
ffor (i in 80:81){
files<- paste('KT', i, '.csv', sep = '')
myfun<- function(d) {
da1<- read.csv(d)
Output[i,1]=da1[1,2]
}
lout<- lapply(files, myfun)
}
But results that says Output doesn´t exists?
I must create before? How?
Many Thans¡¡¡
[[alternative HTML version deleted]]
______________________________________________
R-help@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@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.
