Good question, Jannis.
I couldn't figure out how to specify the j argument in the "[" function as
empty or missing either.
One work around is to specify ALL the columns as the j argument:
test <- matrix(1:4, 2) # I think this is what you meant in your
original post, not matrix[1:4, 2]
result1 <- test[2, ]
result2 <- do.call("[", list(test, 2, seq(dim(test)[2])))
test
result1
result2
Jean
`·.,, ><(((º> `·.,, ><(((º> `·.,, ><(((º>
Jean V. Adams
Statistician
U.S. Geological Survey
Great Lakes Science Center
223 East Steinfest Road
Antigo, WI 54409 USA
From:
Jannis <[email protected]>
To:
[email protected]
Date:
08/03/2011 05:35 AM
Subject:
[R] syntax with do.call and `[`
Sent by:
[email protected]
Dear List,
i would like to mimic the behaviour or the following indexing with a
do.call construct to be able to supply the arguments to `[` as a list:
test = matrix[1:4,2]
result = test[2,]
My try, however, did not work:
result = do.call(`[`,list(test,2,NULL))
result = do.call(`[`,list(test,2,))
result = do.call(`[`,list(test,2,''))
How can I use the do.call in that way with leaving the second indexing
vector blanc?
Cheers
Jannis
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