I see. Thanks for explaining.
If speed is an issue, and if you can assume that indices are properly
sorted in ascending order, I believe this looks like a lazy-reduce
problem. Clojure has no lazy-reduce (or does it?) so I've written my
own:
(defn lazy_reduce [f val coll]
(lazy-seq
(if (seq coll)
(let [val (f val (first coll))]
(cons val (lazy_reduce f val (rest coll)))))))
(defn split [indices coll]
(map first
(lazy_reduce nthnext coll
(map - indices (cons 0 indices)))))
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