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Averaging values in an array [message #91501]

Tue, 21 July 2015 09:50

wdolan
Messages: 29
Registered: June 2015

Junior Member

So I've got an array called 'topscans' which is [333,9], so I am looking through 9 different scans, and each scan has 333 spectral points. I want to average each spectral point for the 9 scans. For example I want to average the first spectral point for all 9 runs, then the 2nd, then the third etc. So that in the end I have a set of 333 spectral points which represents an average of all 9 scans.

Thanks for your help!

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Re: Averaging values in an array [message #91502 is a reply to message #91501]

Tue, 21 July 2015 09:56

a146397258
Messages: 7
Registered: July 2015

Junior Member

Something like:

result=fltarr(333)
for i=0,332 do begin
result[i]=(array[i,0]+array[i,1]+...+array[i,8])/8
endfor

Maybe? I might have messed up something with zero indexing, but something that follows that general idea should work.

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Re: Averaging values in an array [message #91503 is a reply to message #91501]

Tue, 21 July 2015 09:58

wlandsman
Messages: 743
Registered: June 2000

Senior Member

It sounds like you want

IDL> topscans_avg = mean(topscans,dimension=2)

On Tuesday, July 21, 2015 at 12:50:10 PM UTC-4, Wayana Dolan wrote:
> So I've got an array called 'topscans' which is [333,9], so I am looking through 9 different scans, and each scan has 333 spectral points. I want to average each spectral point for the 9 scans. For example I want to average the first spectral point for all 9 runs, then the 2nd, then the third etc. So that in the end I have a set of 333 spectral points which represents an average of all 9 scans.
>
> Thanks for your help!

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Re: Averaging values in an array [message #91505 is a reply to message #91503]

Wed, 22 July 2015 08:10

wdolan
Messages: 29
Registered: June 2015

Junior Member

Great, thank you, it worked!

On Tuesday, July 21, 2015 at 9:58:48 AM UTC-7, wlandsman wrote:
> It sounds like you want
>
> IDL> topscans_avg = mean(topscans,dimension=2)
>
> On Tuesday, July 21, 2015 at 12:50:10 PM UTC-4, Wayana Dolan wrote:
>> So I've got an array called 'topscans' which is [333,9], so I am looking through 9 different scans, and each scan has 333 spectral points. I want to average each spectral point for the 9 scans. For example I want to average the first spectral point for all 9 runs, then the 2nd, then the third etc. So that in the end I have a set of 333 spectral points which represents an average of all 9 scans.
>>
>> Thanks for your help!

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