| How to average every nth data? [message #73400] |
Thu, 04 November 2010 10:53  |
beardown911
Messages: 21
Registered: March 2007
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Junior Member |
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Dear Gurus,
Hope someone will help me how to figure this out.
I've been keep trying to do some spectral resampling (just simple
average) with ASD data.
ASD data is a two dimensional array;
wavelength data
350 0.001146
351 0.001176
352 0.001147
. .
. .
. .
2500 0.0004311
What I've been trying to do is averaging every nth data values and
rewrite into a new array.
For example, if I want to average every 3rd data values, the resulting
array will be
350 0.001150
353 0.001147
and so on.
MS excel seems to be able to handle it, but it wouldn't be a good idea
for processing several hundres files.
I really appreciate if someone could give me tip(s).
Thanks,
Kim
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| Re: How to average every nth data? [message #73451 is a reply to message #73400] |
Sat, 06 November 2010 06:37  |
MC
Messages: 50
Registered: September 1996
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Member |
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Just a thought, is there an aliasing risk in the resulting decimated
spectrum (decimation can break the Nyquist sampling theorem)? If you
just want to reduce data size/spectral resolution, rebin (or congrid)
could be used which will also reduce noise.
Cheers
On Nov 5, 6:53 am, go cats <beardown...@gmail.com> wrote:
> Dear Gurus,
>
> Hope someone will help me how to figure this out.
> I've been keep trying to do some spectral resampling (just simple
> average) with ASD data.
> ASD data is a two dimensional array;
>
> wavelength data
> 350 0.001146
> 351 0.001176
> 352 0.001147
> . .
> . .
> . .
> 2500 0.0004311
>
> What I've been trying to do is averaging every nth data values and
> rewrite into a new array.
> For example, if I want to average every 3rd data values, the resulting
> array will be
>
> 350 0.001150
> 353 0.001147
> and so on.
>
> MS excel seems to be able to handle it, but it wouldn't be a good idea
> for processing several hundres files.
>
> I really appreciate if someone could give me tip(s).
>
> Thanks,
> Kim
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