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Re: Complex rebin [message #34615 is a reply to message #34534]

Fri, 28 March 2003 01:12

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

MKatz843@onebox.com (M. Katz) writes:

>> Any reason why REBIN doesn't take complex args?
>
> I can't say why REBIN doesn't take complex args, but I can say that
> you have to be very careful when you interpolate complex values if you
> want to have meaningful results.
>
> Consider these two numbers
> z1 = complex(1,0) = 1.
> z2 = complex(-1,0) = -1.
>
> Suppose you were using rebin to redice the size of a linear array by
> 2.
> Which of the following behaviors would you want?
>
> You could separately average x and y like this, and get zero:
> z_avg = (complex(1,0) + complex(-1,0))/2. = complex(0,0) = 0

This one. It's what all the other flavors of REBIN do.

It's the "compress" form of REBIN that I would be really interested
in, i.e. the ability to sum up loads of complex values.

Craig

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

		Re: Complex rebin By: the_cacc on Thu, 27 March 2003 06:24
		Re: Complex rebin By: MKatz843 on Wed, 26 March 2003 18:35
		Re: Complex rebin By: Craig Markwardt on Fri, 28 March 2003 01:12

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