Dear all,
I want to apply a function to list elements, two by two. I hoped that combn
would help me out, but I can't get it to work. A nested for-loop works, but
seems highly inefficient when you have large lists. Is there a more
efficient way of approaching this?
# Make some toy data
data(iris)
test <- vector("list",3)
for (i in 1:3){
x <- levels(iris$Species)[i]
tmp <- dist(iris[iris$Species==x,-5])
test[[i]] <- tmp
}
names(test) <- levels(iris$Species)
# nested for loop works
for(i in 1:2){
for(j in (i+1):3){
print(all.equal(test[[i]],test[[j]]))
}
}
# combn doesn't work
combn(test,2,all.equal)
Cheers
Joris
--
Joris Meys
Statistical Consultant
Ghent University
Faculty of Bioscience Engineering
Department of Applied mathematics, biometrics and process control
Coupure Links 653
B-9000 Gent
tel : +32 9 264 59 87
joris.m...@ugent.be
-------------------------------
Disclaimer : http://helpdesk.ugent.be/e-maildisclaimer.php
[[alternative HTML version deleted]]
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
