Thank you very much for all your help. Following your advice, I solved my problem by using the following:
########################################## lines <- readLines("myFile.txt") myline <- lines[myrow] L <- nchar(myline) substr(myline, Col.Ini, Col.Fin) <- NewValue lines[myrow] <- myline readLines(lines, "myFile.txt") ############################################ The 'readLines' was the only R command that I was missing from other programming languages, but now I can implement in R the full code in which I was working. :) Thanks for your fast and good answer, That's one of the thinks that I like the most of the R community !. Kind regards, Mauricio -- =============================== Linux user #454569 -- Ubuntu user #17469 =============================== 2010/12/17 Petr Savicky <savi...@cs.cas.cz>: > On Fri, Dec 17, 2010 at 01:49:23AM -0800, T.V. Nguyen wrote: >> On 17 Dec 2010, at 01:13, Mauricio Zambrano wrote: > [...] >> > but some text, and I now exactly the row that has to be modified and >> > the columns within that row that have to be changed with a new >> > numerical value. > [...] >> You can either edit the line you want manually, or use sub to make changes: >> >> > sub("Lords-a-Leaping","Jaffa Cakes",list) >> > head(list) >> [1] "12 Drummers Drumming" "11 Pipers Piping" >> [3] "10 Jaffa Cakes" "9 Ladies Dancing" >> [5] "8 Maids-a-Milking" "7 Swans-a-Swimming" > > Additionally, if you know the exact character positions, which have > to be changed, then substr() can be used. > > x <- "123456789" > substr(x, 5, 7) <- "abc" > x # [1] "1234abc89" > > For an exact replacement, the length of the new text should be > the same as of the original field. > > Petr Savicky. > > ______________________________________________ > 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.