data$ID -> I always get a NULL
This is my result:
class(data)
[1] "data.frame"
str(data)
'data.frame': 2193 obs. of 83 variables: $ X.ID. : Factor w/ 2193 levels "'18201'",..: 1 2 3 4 5 6 7 8 9 10 ... $ X.kod. : Factor w/ 20 levels "'01'","'02'",..: 1 1 1 1 1 1 1 1 1 1 ... $ X.wiel. : int 7 7 7 7 7 7 7 8 8 8 ... $ X.piech. : num 1 99.9 4 0.5 4 2 99.9 2 2 99.9 ... $ X.rodz. : int NA 2 4 NA 4 2 2 3 2 NA ...
David Winsemius wrote:
On Apr 19, 2009, at 6:45 PM, Grze? wrote:
I have database write as .csv file.
The external sorage format is not likely to be relevant. What might be informative would be to produce the code that reads this file.
When I want to get sth from my database I get NULL, but I know that there is sth! For example:
data$ID
NULL
data$kod
NULL but command like below is always recognize by R
data[2,3]
[1] '082'
Tell is what happens when you enter: str(data) class(data) Perhaps the third column is not named "ID" or "kod" or the object is not a data.frame, but is rather a matrix. -- David Winsemius
In my opinion this problem is also connect with my attempt to create a tree. I always get errors.
t.tree0=rpart(ID~.,t.train)
Error in eval(expr, envir, enclos) : object "ID" not found
t.tree0=rpart(kod~.,t.train)
Error in eval(expr, envir, enclos) : object "kod" not found What I should do to create my simple trees? -- View this message in context: http://www.nabble.com/data%24ID--%3E-I-always-get-a-NULL-tp23128214p23128214.html Sent from the R help mailing list archive at Nabble.com.
______________________________________________ R-help at 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.
David Winsemius, MD Heritage Laboratories West Hartford, CT
______________________________________________ R-help at 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.
View this message in context: http://www.nabble.com/data%24ID--%3E-I-always-get-a-NULL-tp23128214p23132506.html Sent from the R help mailing list archive at Nabble.com.