R help - Nov 2012 - Error in `[.data.frame`... undefined columns selected

When I run this script on 9 variables, it works without problems.

Z <-
data[,c("s1_1234_m","s2_1234_m","s3_1234_m","s4_1234_m","s5_1234_m","s6_1234_m","s7_1234_m","s8_1234_m","s9_1234_m"
)]

However, when I run the script on 9 different variables, it does not work:
Z <-
data[,c("d_s1_m","d_s2_m","d_s3_m","d_s4_m","d_s5_m","d_s6_m","d_s7_m","d_s8m","d_s9m"
)]

Error in `[.data.frame`(data, , c("d_s1_m", "d_s2_m",
"d_s3_m", "d_s4_m",
 :
  undefined columns selected

The first 9 variables are between 0 and 3, there are no missing values in
the dataset.

The second 9 variables are between -3 and 3, there are no missing values in
the dataset.

I am pretty new to R and have no idea what could cause this error.

Thank you

	[[alternative HTML version deleted]]

On Nov 18, 2012, at 6:34 PM, Eiko Fried wrote:
> When I run this script on 9 variables, it works without problems.
>
> Z <-
> data
> [,c
> ("s1_1234_m
> ","s2_1234_m
> ","s3_1234_m
> ","s4_1234_m
>
","s5_1234_m","s6_1234_m","s7_1234_m","s8_1234_m","s9_1234_m"
> )]
>
> However, when I run the script on 9 different variables, it does not  
> work:
> Z <-
> data 
> [,c 
> ("d_s1_m 
> ","d_s2_m 
>
","d_s3_m","d_s4_m","d_s5_m","d_s6_m","d_s7_m","d_s8m","d_s9m"
> )]
>
> Error in `[.data.frame`(data, , c("d_s1_m", "d_s2_m",
"d_s3_m",
> "d_s4_m",
> :
>  undefined columns selected
You have probably misspelled one or more the column names. For  
instance I suspect that one or both of these might be lacking a second  
"_" : "d_s8m","d_s9m"

If you feel thsi is wrong then you at the very least need to offer  
str(data)

BTW, data is the name of a perfectly good function, so naming your  
dataframe "data" is likely to create confusion.

-- 
David.
>
> The first 9 variables are between 0 and 3, there are no missing  
> values in
> the dataset.
>
> The second 9 variables are between -3 and 3, there are no missing  
> values in
> the dataset.
>
> I am pretty new to R and have no idea what could cause this error.
>
> Thank you
>
> 	[[alternative HTML version deleted]]
>
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David Winsemius, MD
Alameda, CA, USA