On Jan 12, 2010, at 6:17 AM, Jean-Baptiste Combes wrote:
Hello,
I use R 2.10, and I am new in R (I used to use SAS and lately
Stata), I am
using XP.
I have a data which has a data.frame format called x.df (read from a
csv
file). I want to take from this data observations for which the
variable
"Code" starts with an "R". I took all the Code and put them into a
vector
vec<-grep("R[A-Z][A-Z]",x.df$Code,value=TRUE)
vec is going to be a vector of row numbers that can be used to address
the data.frame
Then I created a function that is supposed to take all the lines in
the my
data x.df for which "Code" equals one value of "vec". See the code
below
where I created a loop to do that.
That seems to be a very short R one-liner:
data[vec, ]
?"["
--
David.
myfunc<-function(data,var2,var1)
+ {
+ i=1
+ while (i<632){ #where does that come from ?
+ line<-subset(data,var2==var1[i])
+ if (i==1){
+ df<-line
+ df<-data.frame(df)
+ }
+ else {
+ line<-data.frame(line)
+ df<-rbind(df,line)
+ }
+ i<-i+1
+ }
+ fix(df)
+ }
The results of my program higly depend on the few last lines of the
program.
If I put "fix(df)", as above, the function opens a window with my
data and
it seems a sensible results (I have not checked in details but I
barely have
what I am suppose to get).
myfunc<-function(data,var2,var1)
...
+ }
+ df<-data.frame(df)
+ print(is.data.frame(df))
+ }
myfunc(x.df,x.df$Code,vec)
[1] TRUE
print(is.data.frame(df))
[1] FALSE
In the case above I ask whether or not the "df" is a data.frame and
the
answer is true, when the program has ended, I ask again and the
answer is
false.
Could anyone tell me what to do to get this data and could anyone
tell me
why those differences in the results?
as.data.frame(df)
Erreur dans as.data.frame.default(df) :
impossible de convertir automatiquement la classe "function" en un
tableau de données (data.frame)
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
