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Re: IDL, PV-Wave, Matlab, Khoros [message #670]

Thu, 21 January 1993 07:59

thompson
Messages: 584
Registered: August 1991

Senior Member

In article <1jjo6jINN1tn@usenet.INS.CWRU.Edu>, at913@cleveland.Freenet.Edu (Mirko Vukovic) writes...

(stuff deleted)

> Programs written in IDL can be 30-60 times slower than equivalent programs
> written in FORTRAN, but if one uses extensive array manipulation facilities
> execution improves tremendously (factors of 10).

(rest deleted)

Actually our experience has been that, depending on the problem and how the IDL
code is written, IDL routines are just about as fast as an equivalent FORTRAN
routine. The secret seems to be the use of loops. If you can write your code
without any DO loops--and a lot of times you can--then IDL's performance is
just about the same as a FORTRAN routine. If you need to use loops, then
performance suffers greatly from the need to reinterpret the commands over and
over again.

A lot of times I've seen less experienced IDL programs use loops when there
were ways to avoid them--I've been guilty of it myself.

Bill Thompson

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[Message index]

		Re: IDL, PV-Wave, Matlab, Khoros By: thompson on Thu, 21 January 1993 07:59
		Re: IDL, PV-Wave, Matlab, Khoros By: at913 on Wed, 20 January 1993 06:39
		Re: IDL, PV-Wave, Matlab, Khoros By: thompson on Tue, 19 January 1993 13:49
		Re: IDL, PV-Wave, Matlab, Khoros By: kevin on Tue, 19 January 1993 09:58

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