OOPS!! When I wrote "use readline()" below, I meant use readLInes()
Sorry! For more information see ?readLines Ted. On 13-Sep-07 20:32:37, Ted Harding wrote: > On 13-Sep-07 20:06:35, Maura E Monville wrote: >> I have 316 files. Each file represents a patient's breathing >> track (respiratory signal recorded for a variable number of >> cycles). >> All files have the same are made up of a header followed by >> a variable number of records. >> Each record contains 7 comma separated fields. >> The patient ID is recorded in the header which is stripped >> off when reading the file into a R data.frame. >> Since I need to keep this piece of information, I need to add >> the 8th column to a patient's data.frame. All elements of >> such a column store the patient's ID. >> The problem is trivial. I guess it can be done in a matter of >> a few seconds. >> But I (a R novice) could not find an automatic or fast way to >> do that. > > Hi Maura, > There could be several ways to do it, but the important thing > is to know how to "parse out" the Patient ID from the header. > > What is the structure of the header? > > One possibility could be to use readline() to read the header > from the file, before reading the file into R as a dataframe. > > Then parse out the Patient ID, and assign it to a variable. > Then read in the file as a dataframe, find out how many records > are in it, make a column of that number of copies of the Patient > ID, and glue it onto the dataframe. > > Hoping that helps; but if not come back with more info about > that header! > > Of course, once you have the Patient ID in a variable to start > with, perhaps you don't need it as part of the dataframe any more? > > Best wishes, > Ted. > >> I started up editing the patient's data.frame and figured out I can >> only >> copy and past 1 cell at a time ... but I had 4991 cells so ... In >> addition, >> I could not find a way to close the editing session while preserving >> the >> changes in the data.frame. >> So I generated a vector with 4991 elements, all recording the same >> patient-ID call is patient_ID. >> Then I used *cbind(patient.data.frame, patient_ID)* >> to generate a new.patient.data.frame made up of 8 columns, the last >> added >> one recording the patient's ID. >> >> I have no doubt R experienced users would accomplish the same task in >> a >> couple of strokes .... HOW ???? >> >> Another question is: how can multiple cells copy&past be performed >> with >> R >> editor ? >> And how shall I instruct R to save my changes when I close the editing >> session ? >> >> Thank you very much, >> -- >> Maura E.M >> >> [[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. > > -------------------------------------------------------------------- > E-Mail: (Ted Harding) <[EMAIL PROTECTED]> > Fax-to-email: +44 (0)870 094 0861 > Date: 13-Sep-07 Time: 21:32:34 > ------------------------------ XFMail ------------------------------ > > ______________________________________________ > 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. -------------------------------------------------------------------- E-Mail: (Ted Harding) <[EMAIL PROTECTED]> Fax-to-email: +44 (0)870 094 0861 Date: 13-Sep-07 Time: 21:39:17 ------------------------------ XFMail ------------------------------ ______________________________________________ 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.