Ngayee.Law@celeradiagnostics.com
2002-Jun-14 17:16 UTC
[R] combination of different vector values
Hi,
Thanks in advance for the help.
I have a few vectors and I need to get all the combinations of the vector
values.
Normally I would use a few for-loops to do that.
e.g x1_c(1,3,5)
x2_c(2,5,6)
for (i in x1) {
for (j in x2) {
...
}}
My problem is that I don't know how many vectors there are ahead of time,
so
I don't know how many for-loops I need. Any ideas how to implement this?
- Jacqueline
-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
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Take a look at expand.grid. It sounds like it might solve your problem.
Hope this helps,
Matt
-----Original Message-----
From: Ngayee.Law at celeradiagnostics.com
[mailto:Ngayee.Law at celeradiagnostics.com]
Sent: Friday, June 14, 2002 1:16 PM
To: r-help at stat.math.ethz.ch
Subject: [R] combination of different vector values
Hi,
Thanks in advance for the help.
I have a few vectors and I need to get all the combinations of the vector
values.
Normally I would use a few for-loops to do that.
e.g x1_c(1,3,5)
x2_c(2,5,6)
for (i in x1) {
for (j in x2) {
...
}}
My problem is that I don't know how many vectors there are ahead of time,
so
I don't know how many for-loops I need. Any ideas how to implement this?
- Jacqueline
-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.
-.-
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Dear Jacqueline, At 10:16 AM 6/14/2002 -0700, Ngayee.Law at celeradiagnostics.com wrote:>I have a few vectors and I need to get all the combinations of the vector >values. >Normally I would use a few for-loops to do that. >e.g x1_c(1,3,5) > x2_c(2,5,6) > for (i in x1) { > for (j in x2) { > ... > }} > >My problem is that I don't know how many vectors there are ahead of time, >so >I don't know how many for-loops I need. Any ideas how to implement this?You don't say what you want to do within the loops, but you may be able to adapt the following example, which puts the vectors in a list, loops over the list, and uses outer to generate combinations: > x <- 1:3 > y <- 10*(1:3) > z <- 100*(1:3) > lst <- list(x, y, z) > result <- lst[[1]] > for (i in 2:length(lst)) result <- outer(result, lst[[i]], '+') > as.vector(result) [1] 111 112 113 121 122 123 131 132 133 211 212 213 221 222 223 231 [17] 232 233 311 312 313 321 322 323 331 332 333 If this doesn't work, perhaps you could specify the problem in more detail. John ----------------------------------------------------- John Fox Department of Sociology McMaster University Hamilton, Ontario, Canada L8S 4M4 email: jfox at mcmaster.ca phone: 905-525-9140x23604 web: www.socsci.mcmaster.ca/jfox ----------------------------------------------------- -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._