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Re: Numerical Recipes diffs? [message #6366 is a reply to message #6365]

Thu, 20 June 1996 00:00

kachun
Messages: 7
Registered: June 1996

Junior Member

In article <4qbh8u$r9b@fu-berlin.de> marq@strat01.met.fu-berlin.de writes:
> Ka Chun Yu (kachun@bogart.Colorado.EDU) wrote:
> : Does anyone know what IDL did between IDL3 and IDL4 as far as
> : the numerical recipes subroutines go? I've been testing a fitting
> : program that uses the LUDCMP and LUBKSB routines form _Numerical
> : Recipes_, and I've been using IDL's canned routines. The canned
> : routines got name changes during the switch from IDL3 to IDL4,
> : from "nr_ludcmp" and "nr_lubksb" to "ludc" and "lusol". That's
> : not all though--somehow the code got changed around so that I
> : get different results depending on which version of IDL I use
> : even if the input is exactly the same!
> Check the link 'What was New in IDL version 4.0' / Mathematics Improvements'
> of the IDL Online Help (idlhelp, or ? from the IDL command prompt).
> Probably the most important sentence:
>
> "Note that the old routine names still work, but are undocumented."

Yes I noticed this. Unfortunately this statement does not seem to
hold for LUDCMP and LUBKSB. Running "nr_ludcmp" or "nr_lubksb" gives
me a "Variable is undefined:" error in IDL4.

I've now tested the IDL3 and IDL4 equivalents of the above routines
with the same inputs, and both routines give different results in
the two IDL versions.

> Chris Marquardt (marq@strat01.met.fu-berlin.de)
--
--kachun +** Center for Astrophysics and Space Astronomy **+
+** University of Colorado, Boulder **+
+** Email: kachun@casa.colorado.edu **+
+** http://casa.colorado.edu/~kachun **+

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[Message index]

		Re: Numerical Recipes diffs? By: kachun on Fri, 21 June 1996 00:00
		Re: Numerical Recipes diffs? By: kspencer on Thu, 20 June 1996 00:00
		Re: Numerical Recipes diffs? By: kachun on Thu, 20 June 1996 00:00
		Re: Numerical Recipes diffs? By: marq on Thu, 20 June 1996 00:00

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