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Re: Compiling file with many functions: huge performance difference between IDL and IDLDE [message #38621 is a reply to message #38531]

Fri, 19 March 2004 09:26

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

justspam03@yahoo.de (Oliver Thilmann) writes:
...
> How would you calculate a hash value from a string? In C I would
> base it on the ASCII value of the chars, but in IDL? Above mentioned
> implementation converts the string via byte() and then loops over
> the resulting array. Is there a faster way (loops always take so long)?

As JD says, I don't have my own hashtable class on my web page, but I
can send it upon request for now. As Vogel suggest, I avoid looping
by using TOTAL and a precalculated array of hash values. I modeled
some of the interface after the container class.

Craig

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Craig B. Markwardt, Ph.D. EMAIL: craigmnet@REMOVEcow.physics.wisc.edu
Astrophysics, IDL, Finance, Derivatives | Remove "net" for better response
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[Message index]

		Compiling file with many functions: huge performance difference between IDL and IDLDE By: Sidney Cadot on Wed, 17 March 2004 01:47
		Re: Compiling file with many functions: huge performance difference between IDL and IDLDE By: Craig Markwardt on Fri, 19 March 2004 09:26
		Re: Compiling file with many functions: huge performance difference between IDL and IDLDE By: mwvogel on Fri, 19 March 2004 03:30
		Re: Compiling file with many functions: huge performance difference between IDL and IDLDE By: justspam03 on Fri, 19 March 2004 02:06
		Re: Compiling file with many functions: huge performance difference between IDL and IDLDE By: JD Smith on Thu, 18 March 2004 17:11
		Re: Compiling file with many functions: huge performance difference between IDL and IDLDE By: Sidney Cadot on Thu, 18 March 2004 14:48
		Re: Compiling file with many functions: huge performance difference between IDL and IDLDE By: btt on Thu, 18 March 2004 12:50
		Re: Compiling file with many functions: huge performance difference between IDL and IDLDE By: Sidney Cadot on Thu, 18 March 2004 12:40
		Re: Compiling file with many functions: huge performance difference between IDL and IDLDE By: Sidney Cadot on Thu, 18 March 2004 12:36
		Re: Compiling file with many functions: huge performance difference between IDL and IDLDE By: Sidney Cadot on Thu, 18 March 2004 12:32
		Re: Compiling file with many functions: huge performance difference between IDL and IDLDE By: justspam03 on Thu, 18 March 2004 01:13
		Re: Compiling file with many functions: huge performance difference between IDL and IDLDE By: andrew.cool on Wed, 17 March 2004 14:02
		Re: Compiling file with many functions: huge performance difference between IDL and IDLDE By: mvukovic on Wed, 17 March 2004 12:16
		Re: Compiling file with many functions: huge performance difference between IDL and IDLDE By: Mark Hadfield on Mon, 22 March 2004 15:45
		Re: Compiling file with many functions: huge performance difference between IDL and IDLDE By: richard.martin on Mon, 22 March 2004 05:49

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