On 14-02-11 5:30 AM, Marc Marí Dell'Olmo wrote:
Dear all,
I want to do a loop with foreach. But, I would like to include a condition
with "next" to don't loop over some elements.
For example, I would like to translate this "for loop" to a "foreach loop":
for (i in 1:10) {
for (j in 1:2) {
...
if((i==2 & j==1) | (i==4 & j==3)) { next }
...
}
}
Foreach loop???
foreach (i = c(1:10)) %do%{
foreach (j = c(1:2)) %do%{
#I don't know how to include a "next"!!
...
}
}
I don't know the foreach package; you might want to direct your
questions to its maintainer. But you can always emulate next using an
if(), e.g. with a regular for loop,
for (i in 1:10) {
if (cond) next
...
}
is the same as
for (i in 1:10) {
if (!cond) {
...
}
}
My vague understanding of the idea behind the foreach package is that
the different runs through the loop can be run independently so they can
be parallelized. If that's the case, you might be able to evaluate cond
for each i before the loop starts, and then do the equivalent of
for (i in (1:10)[!cond]) {
...
}
Duncan Murdoch
Thank you!
Marc
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