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,] 1 0 7
[2,] 2 9 5
[3,] 3 0 9
[4,] 2 7 8
[5,] 2 9 8
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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