I just had to solve this problem for myself, after not having luck with the
code posted above. I'm posting in case others need a completely general
function.
riffle <- function (a,b) {
# Interleave a & b, starting with a, without repeating.
x <- NULL; count = 1;
for (i in 1:max(length(a), length(b))) {
if (i <= length(a)) {
x[count] <- a[i];
count = count+1;
};
if (i <= length(b)) {
x[count] <- b[i];
count = count+1;
}
};
x
};
riffle( 1:10, 50:55 )
--
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