Potential helpers need more information. Type:
head(a) and str(a) and post the results. Compare with the output of the same commands on a dataframe that does have this problem. -Don At 5:01 PM +0530 8/25/05, Krishna wrote: >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 -- -------------------------------------- Don MacQueen Environmental Protection Department Lawrence Livermore National Laboratory Livermore, CA, USA ______________________________________________ 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