On Sunday, Nov 3, 2002, at 17:13 Australia/Sydney, Terry Vogelaar wrote:
Hi all,
snip
So I tried the same technique with another script that has a triple repeat loop. The var "t" contains about 150 short lines and the script is intended to put every possible combination of 3 lines of t into a field:Terry
repeat with f1 = 1 to the number of lines of t - 2
put line f1 of t into g1
repeat with f2 = f1+1 to the number of lines of t - 1
put line f2 of t into g2
repeat with f3 = f2+1 to the number of lines of t
put line f3 of t into g3
put g1&","&g2&","&g3& return after fld "uitvoer"
end repeat
end repeat
end repeat
That took 101 seconds. So I tried to speed it up with what I learned about "repeat for each":
put line 1 to -3 of t into t1
put 0 into f1
repeat for each line g1 in t1
add 1 to f1
put line f1+1 to -2 of t into t2
put 0 into f2
repeat for each line g2 in t2
add 1 to f2
put line f2+1 to -1 of t into t3
repeat for each line g3 in t3
put g1&","&g2&","&g3& return after fld "uitvoer"
end repeat
end repeat
end repeat
364 seconds! And I thought it would be faster! It involved some extra vars, but since it is not much data processed, I don't think memory issues could explain this.
Any thoughts why this is much slower than the original script and how I can speed this up?
I can see why repeat for each failed here - you need to extract subsets of the main list for each of the inner RFE loops for each time through its outer loop. Thus, you are extracting by line numbers and doing more work than in the first instance. RFE is fast through each sub-list but the work of continually creating new lists is an overwhelming burden. Not sure how to solve it using arrays as you seem to wind up with the same problem only this time fiddling with keys. Since Richard suggested that approach, perhaps he has something in mind.....
regards
David
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