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Re: Patch to userlib/deriv.pro to add MAX_VALUE keyword [message #1555 is a reply to message #1554]

Mon, 27 December 1993 12:34

schmitt
Messages: 3
Registered: December 1993

Junior Member

This is somewhat besides the point of the original posting, but it has to do
with a (granted, nitpicking) bug in the userlib routine deriv.pro.
You might as well fix it when you make the posted patch.

Basically, here's a use of "float(...)" in deriv.pro that is unneeded,
and makes the resulting answer wrong and/or inaccurate if any other type
of data (complex, double, ...&c) is passed as the Y value.
The unneeded usage of float occurs about here:

> d = float(shift(y,-1) - shift(y,1))/(shift(x,-1) - shift(x,1))
^^^^^
remove the "float", and the applicability of the routine improves.

---------------
Andy Schmitt / Code 6730 / Naval Research Lab / Washington DC 20375
schmitt@this.nrl.navy.mil
usual disclaimers apply

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[Message index]

		Re: Patch to userlib/deriv.pro to add MAX_VALUE keyword By: thompson on Mon, 27 December 1993 15:23
		Re: Patch to userlib/deriv.pro to add MAX_VALUE keyword By: nowicki on Mon, 27 December 1993 02:50
		Re: Patch to userlib/deriv.pro to add MAX_VALUE keyword By: schmitt on Mon, 27 December 1993 12:34
		Re: Patch to userlib/deriv.pro to add MAX_VALUE keyword By: thompson on Mon, 27 December 1993 08:04

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