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$X
NULL Andy
From: Krishna Hi Mr. Pedro I tried names(a) and it displayed the names as X, Y and Z. rgds snvk On 8/25/05, Pedro J. Aphalo <pedro.aphalo at cc.jyu.fi> wrote:
Hi, Did you try names(a) so see what are the names of the columns in the dataframe? Hope this helps a little. Pedro. Krishna wrote:
Hi All recently i faced an unknown problem while reading the data. Can someone help me in understanding why this happened. I have .txt file containing X, Y, Z variables. I used the command
a <- read.table("filename", header=TRUE)
after reading the file i am able to view it by tryping a. but i am unable to access the variables in a, by giving the command a$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
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http://www.R-project.org/posting-guide.html -- ================================================================== Pedro J. Aphalo Department of Biological and Environmental Science University of Jyv??skyl?? P.O. Box 35, 40351 JYV??SKYL??, Finland Phone +358 14 260 2339 Mobile +358 50 3721504 Fax +358 14 260 2321 mailto:pedro.aphalo at cc.jyu.fi http://www.jyu.fi/~aphalo/ ,,,^..^,,, ================================================================== ______________________________________________ R-help at 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