Memory bloat -- what have I done?
- To: mathgroup at smc.vnet.net
- Subject: [mg19219] Memory bloat -- what have I done?
- From: "Aram Schiffman" <aram at sirius.com>
- Date: Tue, 10 Aug 1999 02:53:05 -0400
- Organization: Posted via Supernews, http://www.supernews.com
- Sender: owner-wri-mathgroup at wolfram.com
Hi. Help?
I have this:
outOfHoleIndex = {};
If[MemberQ[inHoleIndex, #] === False, AppendTo[outOfHoleIndex, #],] & /@
nums;
inHoleIndex is an array of reals, inHoleIndex//Length is about 8000 or so.
Nums is just the counting numbers {1,2,3,...11875}.
I check MemoryInUse[] before and after, and get -- a difference of about 158
megabytes! Huge! What the hell am I doing wrong? If I do
Unprotect[Out]; Clear[Out]; Protect[Out];
Then I get most of that memory back. Also, if I rig the code so that MemberQ
is always True (i.e., never AppendTo outOfHoleIndex), this big chunk of
memory never gets moved. I guess I don't understand how AppendTo contributes
to Out, here, and more importantly, how to write my code correctly.
Anyone?
Thanks,
Aram