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Re: Estimating continuous functions

by hossman (Prior)
on Mar 29, 2004 at 07:38 UTC ( #340530=note: print w/replies, xml ) Need Help??


in reply to Estimating continuous functions

As I understand it, this is generally considered a "doozy" of a problem. You have to accept the fact, that for any sets of points, there are an infinte number of curves that fit them, and except in simple cases, there's usually no way to determine that one curve is "more correct" then another -- and in the really simple cases, it's even worse (consider the points where y=cos(x) and y=sin(x) intersect, then consider how man even simpler curves all go through the same points).

There do however seem to be a few papers online that discuss how you can approximate it if you're willing to make ceratin assumptions. The math is way over my head, but knock yourself out...

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[Cosmic37]: greetings earthlings please can someone improve my pathetic perl knowledge
[Cosmic37]: I have 2 files each with datetime and other data in unknown order and I want to find rows from both files matching by datetime and output them combined/ concatenated
[Corion]: Sure
[Corion]: Do you have any specific interests or general Perl knowledge?
[Cosmic37]: should I slurp? should I grep? Noble Lords I wish you good karma and beg your advice
[Corion]: Cosmic37: Ah, see perlfaq4, about How do I compute the intersection of two arrays
[Cosmic37]: I am out of practice; I use Perl for scientific programming for number crunching
[Corion]: Cosmic37: Basically, you read one file into a hash, keyed by your key, and then match the lines from the second file to that hash

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