Nope, that doesn't make any difference; if something's keeping hold of the
head, it isn't the take:

=> (first (drop 19999999 (add-ch)))

OutOfMemoryError Java heap space  clojure.lang.RT.cons (RT.java:552)

=> (first (drop 19999999 (add-layer)))

OutOfMemoryError Java heap space  java.lang.AbstractStringBuilder.<init>
(AbstractStringBuilder.java:45)



On Fri, Jun 8, 2012 at 11:32 AM, Chris Perkins <chrisperkin...@gmail.com>wrote:

> On Thursday, June 7, 2012 1:53:30 PM UTC-4, Tom Hume wrote:
>>
>> Hi
>>
>> I'm trying to generate a sequence which corresponds to a breadth-first
>> search of a very wide, deep tree... and I'm hitting memory problems when I
>> go too far along the sequence. Having asked around on the IRC channel and
>> looked here, the number 1 cause of such problems is inadvertently holding
>> onto the head; but I can't see where I'm doing this.
>>
>> (dorun (take 20000000 (add-layer)))
>>
> take holds on to the head, because that is what it returns. Try changing
> take to drop.
>
> - Chris
>
>
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