[R] specifying column names in a vector of characters and the use?
Hi,
What I would like to do is have a data.frame with column names and have
these column names stored as strings in another vector. Then I would like
to be able to access the data.fram columns via referencing the vector of
names. The code below shows the last few executions that failed to retrieve
the values for column named X1. Seth
table.1-cbind(c(1,2,3,2,2),c(0,9,0,7,9),c(7,5,9,8,8))
table.1
[,1] [,2] [,3]
[1,]107
[2,]295
[3,]309
[4,]278
[5,]298
table.1-data.frame(table.1)
table.1
X1 X2 X3
1 1 0 7
2 2 9 5
3 3 0 9
4 2 7 8
5 2 9 8
hold-c(X1,X2,X3)
hold
[1] X1 X2 X3
table.1$X1
[1] 1 2 3 2 2
hold[1]
[1] X1
table.1$hold[1] # FROM HERE DOWN ARE MY ATTEMPTS TO ACCESS X1
NULL
table.1$(hold[1])
Error: unexpected '(' in table.1$(
table.1$get(hold[1])
Error: attempt to apply non-function
table.1$(get(hold[1]))
Error: unexpected '(' in table.1$(
--
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Re: [R] specifying column names in a vector of characters and the use?
Hello,
What I would like to do is have a data.frame with column names and have
these column names stored as strings in another vector. Then I would like
to be able to access the data.fram columns via referencing the vector of
names. The code below shows the last few executions that failed to retrieve
the values for column named X1. Seth
table.1-cbind(c(1,2,3,2,2),c(0,9,0,7,9),c(7,5,9,8,8))
table.1
[,1] [,2] [,3]
[1,]107
[2,]295
[3,]309
[4,]278
[5,]298
See easier way to construct your object below.
snip
[1] X1
table.1$hold[1] # FROM HERE DOWN ARE MY ATTEMPTS TO ACCESS X1
NULL
table.1$(hold[1])
Error: unexpected '(' in table.1$(
table.1$get(hold[1])
Error: attempt to apply non-function
table.1$(get(hold[1]))
Error: unexpected '(' in table.1$(
You need to index with ?[
Here is a complete example:
table.1- data.frame(X1 = c(1,2,3,2,2),
X2 = c(0,9,0,7,9),
X3 = c(7,5,9,8,8))
hold - names(table.1)
## to return a data.frame
table.1[hold[1]]
## to return a vector
table.1[[hold[1]]]
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Re: [R] specifying column names in a vector of characters and the use?
Try:
table.1[[hold[1]]]
Cheers,
Simon.
On 19/07/10 12:09, Seth wrote:
Hi,
What I would like to do is have a data.frame with column names and have
these column names stored as strings in another vector. Then I would like
to be able to access the data.fram columns via referencing the vector of
names. The code below shows the last few executions that failed to retrieve
the values for column named X1. Seth
table.1-cbind(c(1,2,3,2,2),c(0,9,0,7,9),c(7,5,9,8,8))
table.1
[,1] [,2] [,3]
[1,]107
[2,]295
[3,]309
[4,]278
[5,]298
table.1-data.frame(table.1)
table.1
X1 X2 X3
1 1 0 7
2 2 9 5
3 3 0 9
4 2 7 8
5 2 9 8
hold-c(X1,X2,X3)
hold
[1] X1 X2 X3
table.1$X1
[1] 1 2 3 2 2
hold[1]
[1] X1
table.1$hold[1] # FROM HERE DOWN ARE MY ATTEMPTS TO ACCESS X1
NULL
table.1$(hold[1])
Error: unexpected '(' in table.1$(
table.1$get(hold[1])
Error: attempt to apply non-function
table.1$(get(hold[1]))
Error: unexpected '(' in table.1$(
--
Simon Blomberg, BSc (Hons), PhD, MAppStat.
Lecturer and Consultant Statistician
School of Biological Sciences
The University of Queensland
St. Lucia Queensland 4072
Australia
T: +61 7 3365 2506
email: S.Blomberg1_at_uq.edu.au
http://www.uq.edu.au/~uqsblomb/
Policies:
1. I will NOT analyse your data for you.
2. Your deadline is your problem
Statistics is the grammar of science - Karl Pearson.
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and provide commented, minimal, self-contained, reproducible code.
Re: [R] specifying column names in a vector of characters and the use?
On Jul 18, 2010, at 10:09 PM, Seth wrote:
Hi,
What I would like to do is have a data.frame with column names and
have
these column names stored as strings in another vector. Then I
would like
to be able to access the data.fram columns via referencing the
vector of
names. The code below shows the last few executions that failed to
retrieve
the values for column named X1. Seth
table.1-cbind(c(1,2,3,2,2),c(0,9,0,7,9),c(7,5,9,8,8))
table.1
[,1] [,2] [,3]
[1,]107
[2,]295
[3,]309
[4,]278
[5,]298
table.1-data.frame(table.1)
table.1
X1 X2 X3
1 1 0 7
2 2 9 5
3 3 0 9
4 2 7 8
5 2 9 8
hold-c(X1,X2,X3)
hold
[1] X1 X2 X3
table.1$X1
[1] 1 2 3 2 2
hold[1]
[1] X1
table.1$hold[1] # FROM HERE DOWN ARE MY ATTEMPTS TO ACCESS X1
NULL
Try instead:
table.1[ , hold[1] ]
The $ formalism does not evaluate its argument, but the [ function
does.
--
David.
table.1$(hold[1])
Error: unexpected '(' in table.1$(
table.1$get(hold[1])
Error: attempt to apply non-function
table.1$(get(hold[1]))
Error: unexpected '(' in table.1$(
--
View this message in context:
http://r.789695.n4.nabble.com/specifying-column-names-in-a-vector-of-characters-and-the-use-tp2293494p2293494.html
Sent from the R help mailing list archive at Nabble.com.
__
R-help@r-project.org mailing list
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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.
__
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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.
