Could it be that there are spaces in the names that were read in? > a <- data.frame(" X"=1:2, " Y"=3:4, " Z"=5:6, check.names=FALSE) > a X Y Z 1 1 3 5 2 2 4 6 > names(a) [1] " X" " Y" " Z" > a$X NULL
Andy > From: Krishna > > Hi Mr. Pedro > > I tried names(a) and it displayed the names as X, Y and Z. > > rgds > > snvk > > On 8/25/05, Pedro J. Aphalo <[EMAIL PROTECTED]> wrote: > > Hi, > > > > Did you try names(a) so see what are the names of the columns in the > > dataframe? > > > > Hope this helps a little. > > > > Pedro. > > > > Krishna wrote: > > > Hi All > > > > > > recently i faced an unknown problem while reading the data. Can > > > someone help me in understanding why this happened. > > > > > > I have .txt file containing X, Y, Z variables. I used the command > > > > > > > > >>a <- read.table("filename", header=TRUE) > > > > > > after reading the file i am able to view it by tryping a. but i am > > > unable to access the variables in a, by giving the command a$X. > > > > > > > > >>a$X > > >>NULL > > > > > > > > > this is the output it was showing. However the same i am able to > > > access by giving a[[1]]. i tried changing the mode by > issuing command > > > a <- as.data.frame(a). But situation remains the same. > > > > > > look forward for experts suggestion on this. > > > > > > rgds > > > > > > snvk > > > > > > ______________________________________________ > > > 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 > > > > > > -- > > > ================================================================== > > Pedro J. Aphalo > > Department of Biological and Environmental Science > > University of Jyväskylä > > P.O. Box 35, 40351 JYVÄSKYLÄ, Finland > > Phone +358 14 260 2339 > > Mobile +358 50 3721504 > > Fax +358 14 260 2321 > > mailto:[EMAIL PROTECTED] > > http://www.jyu.fi/~aphalo/ ,,,^..^,,, > > ================================================================== > > > > > > ______________________________________________ > 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