Thanks, this explains the stack overflow On Thursday, June 14, 2012 4:12:28 PM UTC+3, Dave Sann wrote: > > also > > (first (drop 100000 (iterate #(doall (map inc %)) (range 10)))) > > so the better answer is probably - because map is lazy > > > On Thursday, 14 June 2012 23:06:27 UTC+10, Dave Sann wrote: >> >> I suspect that the answer is the use of partial and the implementation of >> iterate >> >> with (comp vec... you force realisation of the vector >> >> without this I think you get (partial map (partial map (partial ....) as >> f is repeatedly applied >> >> if you do this, >> >> (first (drop 100000 (iterate #(apply list (map inc %)) (range 10)))) >> >> which forces the list to be realised, it wont overflow >> >> D >> >> >> On Thursday, 14 June 2012 23:00:15 UTC+10, Dave Sann wrote: >>> >>> ah...but does for 10000 >>> >>> >>> On Thursday, 14 June 2012 22:58:58 UTC+10, Dave Sann wrote: >>>> >>>> It doesn't overflow for me. >>>> >>>> >>>> user=> (first (drop 1000 (iterate (partial map inc) (range 10)))) >>>> (1000 1001 1002 1003 1004 1005 1006 1007 1008 1009) >>>> >>>> >>>> On Thursday, 14 June 2012 22:52:33 UTC+10, vmargioulas wrote: >>>>> >>>>> Can someone explain why >>>>> ... iterating over a sequence cause a stack overflow >>>>> (first (drop 1000 (iterate (partial map inc) (range 10)))) -> >>>>> java.lang.StackOverflowError >>>>> >>>>> ...but iterating over a vector works ok? >>>>> (first (drop 1000 (iterate (comp vec (partial map inc)) (range 10)))) >>>>> - >>>>> > [1000 1001 1002 1003 1004 1005 1006 1007 1008 1009] >>>>> >>>>
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