[R] pasting together 2 character arrays

[David Reiner]

Always good to have that fourth way, just in case ....

> (Array3 <- as.vector(outer(Array2[-1], Array1, FUN=function(x, y) paste(y, Array2[1], x, sep="."))))
[1] "height.trt0.trt1" "height.trt0.trt2" "weight.trt0.trt1" "weight.trt0.trt2" "age.trt0.trt1"    "age.trt0.trt2"
[7] "sex.trt0.trt1"    "sex.trt0.trt2"

HTH,
David L. Reiner
XR Trading LLC

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of Maas James Dr (MED)
Sent: Tuesday, August 31, 2010 8:17 AM
To: r-help at r-project.org
Subject: [R] pasting together 2 character arrays

If possible I would like to combine two different character arrays in combinations

Array1 <- c("height","weight","age","sex")

Array2 <- c("trt0","trt1","trt2")

I would like to combine these two character vectors to end up with such ...

Array3

"height.trt0.trt1"
"height.trt0.trt2"
"weight.trt0.trt1"
"weight.trt0.trt2"
"age.trt0.trt1"
"age.trt0.trt2"
"sex.trt0.trt1"
"sex.trt0.trt2"

I'm trying combinations of the "combinations" and "paste" functions, but no luck yet!
Any suggestions about most efficient approach most welcome.
Thanks

Jim

===============================
Dr. Jim Maas
University of East Anglia


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