Re: [R] How to read a row dataset one by one

From: Jan Sabee <jan.sabee_at_gmail.com>
Date: Fri 10 Jun 2005 - 20:49:24 EST

For Henrik and Clark, thanks for your help. Then If I load to dataframe,
MM16 <- read.table("G:\\Stuff\\data\\MM16.txt") MM16
x1 x2 x3 x4 x5 y
a b a c c M1
c b b c c M4
c c a c c M2
c a c a a M2
c c a a a M1
c a b c a M3
c c a b c M3

c a c a b M2
c c a b a M1

How can I do it.
Thanks again for your help.
Jan Sabee

On 6/10/05, Henrik Bengtsson <hb@maths.lth.se> wrote:
> Open a connection a read line by line from that one, e.g.
>
> myReadPrint <- function(pathname, ...) {
> con <- file(pathname, open="r")
> on.exit(close(con)) # Guarantees to close connection!
>
> count <- 0;
> while(TRUE) {
> line <- scan(con, sep="\t", nlines=1, fill=TRUE,
> quiet=TRUE, what="raw");
> # Alternatively, just...
> # line <- readLines(con, n=1)
> if (length(line) == 0)
> break;
> count <- count + 1;
> cat("read row no ", count, ",\n", sep="");
> print(line);
> }
> }
>
> See ?file for more details.
>
> /Henrik
>
> Clark Allan wrote:
> > use a loop associated with the scan function.
> >
> > for (i in 1:9)
> > {
> >
> > print(scan(file="c:/a.txt",sep="\t",skip=i,nlines=1,fill=T,quiet=T,what="raw"))
> > }
> >
> >
> > this works but there has to be a better solution
> >
> >
> >
> > Jan Sabee wrote:
> >
> >>Dear all,
> >>How to read a row dataset one by one and then print it.
> >>
> >>x1 x2 x3 x4 x5 y
> >>a b a c c M1
> >>c b b c c M4
> >>c c a c c M2
> >>c a c a a M2
> >>c c a a a M1
> >>c a b c a M3
> >>c c a b c M3
> >>c a c a b M2
> >>c c a b a M1
> >>
> >>I need a result like
> >>read row no 1,
> >>[1] a b a c c M1
> >>read row no 2,
> >>[1] c b b c c M4
> >>.
> >>.
> >>.
> >>the last row,
> >>[1] c c a b a M1
> >>
> >>Kind regards,
> >>Jan Sabee
> >>
> >>______________________________________________
> >>R-help@stat.math.ethz.ch mailing list
> >>https://stat.ethz.ch/mailman/listinfo/r-help
> >>PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
> >>
> >>
> >>------------------------------------------------------------------------
> >>
> >>______________________________________________
> >>R-help@stat.math.ethz.ch mailing list
> >>https://stat.ethz.ch/mailman/listinfo/r-help
> >>PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
>
>



R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Fri Jun 10 20:57:54 2005

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