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Re: How to rebin complex array? [message #39016 is a reply to message #39013]

Wed, 14 April 2004 06:47

James Kuyper
Messages: 425
Registered: March 2000

Senior Member

Timm Weitkamp wrote:
...
> u = 1 + FLTARR(k) ; create unit vector with k elements

A unit vector is a vector such that total(u*u) eq 1.0" (or for complex
numbers, total(u*conj(u)) eq 1.0). What you've described is a vector
whose elements are all 1, which has no special name.

...
> By the way, there is a good reason for REBIN not to work on complex
> arrays, and that is the fact that there is not really any proper way of
> interpolating between two complex values.

Why in the world not? All of the normal interpolation formulas work
perfectly well when applied seperately to the real and imaginary
components of a table of complex values. The formulas just involve
multiplcation, division, addition, and subtraction, all of which are
perfectly well defined for complex numbers, and they produce reasonable
results (well, not quite - in some higher-order interpolation algorithms
it's necessary to replace c^2 with c*conj(c) in some places).

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[Message index]

		Re: How to rebin complex array? By: Yunxiang Zhang on Wed, 14 April 2004 13:01
		Re: How to rebin complex array? By: R.G. Stockwell on Wed, 14 April 2004 09:31
		Re: How to rebin complex array? By: James Kuyper on Wed, 14 April 2004 06:47
		Re: How to rebin complex array? By: Timm Weitkamp on Wed, 14 April 2004 00:39
		Re: How to rebin complex array? By: Peter Mason on Tue, 13 April 2004 17:47
		Re: How to rebin complex array? By: Mark Hadfield on Tue, 13 April 2004 17:10

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