R help - Sep 2003 - dataframe subsetting

I can create a small dataset, "x" below, and subset out rows based on 
values of a certain variable.  However, on the dataset I'm working on now, 
"latdata" below, I get a subscript error.  Any advice is appreciated!

Ryan


Successful:
> is.data.frame(x)
[1] TRUE
> x
  X1 X2 X3
1  1  3  5
2  2  4  6
> x[x$X2 %in% c(3),]
  X1 X2 X3
1  1  3  5

Unsuccessful:
> is.data.frame(latdata)
[1] TRUE
> is.numeric(latdata$intent)
[1] TRUE
> table(latdata$intent)
  1   2   3   4   5   6 
 34  23  67 179 996   2 
> unlikely <- latdata[latdata$intent %in% c(1,2,3,4),]
Error in x[[j]] : subscript out of bounds


------------------------------------------
Ryan T. Moore ~ Government & Social Policy
Ph.D. Candidate ~ Harvard University

Ryan  -

Puzzling.  My best guess is a misspelling or a truncation
in the column name "intent" within latdata in the context of
> unlikely <- latdata[latdata$intent %in% c(1,2,3,4),]
but I do not see any such misspelling in your email.  Could
you try again, using some other way to specify the column on
which you wish to subset ?  Such as: figure out what number
the column is (say it's the fifth column in latdata) and use
> unlikely <- latdata[latdata[[5]] %in% c(1,2,3,4),]
Otherwise, your R syntax looks fine to me.  Try also asking
> is.factor(latdata$intent)
but I don't think that would have caused the error message
you see.

-  tom blackwell  -  u michigan medical school  -  ann arbor  -

On Wed, 10 Sep 2003, Ryan Thomas Moore wrote:
> I can create a small dataset, "x" below, and subset out rows
based on
> values of a certain variable.  However, on the dataset I'm working on
now,
> "latdata" below, I get a subscript error.  Any advice is
appreciated!
>
> Ryan
>
> Successful:
>
> > is.data.frame(x)
> [1] TRUE
> > x
>   X1 X2 X3
> 1  1  3  5
> 2  2  4  6
> > x[x$X2 %in% c(3),]
>   X1 X2 X3
> 1  1  3  5
>
> Unsuccessful:
>
> > is.data.frame(latdata)
> [1] TRUE
> > is.numeric(latdata$intent)
> [1] TRUE
> > table(latdata$intent)
>
>   1   2   3   4   5   6
>  34  23  67 179 996   2
> > unlikely <- latdata[latdata$intent %in% c(1,2,3,4),]
> Error in x[[j]] : subscript out of bounds
> ------------------------------------------
> Ryan T. Moore ~ Government & Social Policy
> Ph.D. Candidate ~ Harvard University

Can you cut the data.frame down to just 2 rows and 2 columns that 
display the error?  You might find the error in the process of doing 
that.  If not, you should be able to distribute your same question with 
an example so anyone else can reproduce the problem.

This doesn't answer your question, but this technique can be used to 
resolve many difficult problems.

spencer graves

Ryan Thomas Moore wrote:
> I can create a small dataset, "x" below, and subset out rows
based on
> values of a certain variable.  However, on the dataset I'm working on
now,
> "latdata" below, I get a subscript error.  Any advice is
appreciated!
> 
> Ryan
> 
> 
> Successful:
> 
> 
>>is.data.frame(x)
> 
> [1] TRUE
> 
>>x
> 
>   X1 X2 X3
> 1  1  3  5
> 2  2  4  6
> 
>>x[x$X2 %in% c(3),]
> 
>   X1 X2 X3
> 1  1  3  5
> 
> Unsuccessful:
> 
> 
>>is.data.frame(latdata)
> 
> [1] TRUE
> 
>>is.numeric(latdata$intent)
> 
> [1] TRUE
> 
>>table(latdata$intent)
> 
> 
>   1   2   3   4   5   6 
>  34  23  67 179 996   2 
> 
>>unlikely <- latdata[latdata$intent %in% c(1,2,3,4),]
> 
> Error in x[[j]] : subscript out of bounds
> 
> 
> ------------------------------------------
> Ryan T. Moore ~ Government & Social Policy
> Ph.D. Candidate ~ Harvard University
> 
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