Lisa Wang <lisawang <at> uhnres.utoronto.ca> writes:
:
: Hi there,
:
: I'm writing a function which involves a loop. What to write in the "?"
: place would allow it skips the "for loop" and goes to "a[i]<-0".
:
: a<-b[s>3,]
:
: if (nrow(a)==0) ?????????????
:
: for (i in 1:nrow(a)){
: a[i]<-1
: }
: a[i]<-0
There are a number of errors in the above but I assume your question
is how to set up a loop over an index of the rows of a so that the
loop executes zero times if a has no rows. Try this:
for(i in seq(len=nrow(a))) ...
Also, depending on what you want to do, you might consider whether you
need a loop in the first place.
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