in the specific example you could consider something like this:
test <- array(c(1:16), dim = c(3,4,3)) ## test.ind <- rbind(c(2,4,1), c(2,4,2), c(2,4,3)) test[test.ind] test[2,4,]
I hope it helps.
Best, Dimitris
---- Dimitris Rizopoulos Ph.D. Student Biostatistical Centre School of Public Health Catholic University of Leuven
Address: Kapucijnenvoer 35, Leuven, Belgium Tel: +32/16/336899 Fax: +32/16/337015 Web: http://www.med.kuleuven.ac.be/biostat/ http://www.student.kuleuven.ac.be/~m0390867/dimitris.htm
----- Original Message ----- From: "Christoph Lehmann" <[EMAIL PROTECTED]>
To: <R-help@stat.math.ethz.ch>
Sent: Tuesday, April 19, 2005 3:11 PM
Subject: [R] indexing an array using an index-array, but one entry being ', '
Hi I have the following array:
test <- array(c(1:16), dim = c(3,4,3)) test ## I call some enries using an index array test.ind <- array(rbind(c(1,2,1), c(3,3,2)), dim = c(2,3)) test[test.ind]
## suppose I want all values in the 2nd row and 4th col over ## all three 3rd dimensions test[2,4,]
how to specify a test.ind array with the last index left with ',' i.e
test.ind should be evaluated as "2, 4, , " so that it can be
calledlike above as test[test.ind] and the
result should be [1] 11 7 3
thanks for a hint Cheers christoph
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