On Aug 17, 2012 4:53 PM, David Jacobs da...@wit.io wrote:
Okay that's great. Thanks, you guys. Was read-lines only holding onto
the head of the line seq because I bound it in the let statement?
No; (partial nth values) holds on to values, and map holds on to the
function you give it.
Omitting
. Interestingly, if I manually pull out a line from the file
with something like `(nth lines 200)`, the `multi-nth` call works for all
values = 200.
Any idea what's going on?
PS This question is on SO if someone wants points:
http://stackoverflow.com/questions/11995807/lazily-extract-lines-from
points:
http://stackoverflow.com/questions/11995807/lazily-extract-lines-from-large-file
The lazyness of map is biting you. The result of read-lines will not
have been fully realized before the file is closed. Also, calling nth
repeatedly is not going to do wonders for efficiency. Try
. Interestingly, if I manually pull out a line from the file
with something like `(nth lines 200)`, the `multi-nth` call works for all
values = 200.
Any idea what's going on?
PS This question is on SO if someone wants points:
http://stackoverflow.com/questions/11995807/lazily-extract-lines-from
. Interestingly, if I manually pull out a line from the file
with something like `(nth lines 200)`, the `multi-nth` call works for all
values = 200.
Any idea what's going on?
PS This question is on SO if someone wants
points:
http://stackoverflow.com/questions/11995807/lazily-extract-lines-from
On Thu, Aug 16, 2012 at 5:47 PM, David Jacobs da...@wit.io wrote:
I'm trying to grab 5 lines by their line numbers from a large ( 1GB) file
with Clojure.
So far I've got:
(defn multi-nth [values indices]
(map (partial nth values) indices))
(defn read-lines [file indices]
(with-open
