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Re: array problems [message #61294 is a reply to message #61293]

Fri, 11 July 2008 12:02

Jean H.
Messages: 472
Registered: July 2006

Senior Member

David Sheerin wrote:
> Hi All
> I have a palindromic vector of floats, e.g. [a,b,c,b,a] , and I would like
> to expand it to include the mean between each value like [(0+a)/2, a,
> (a+b)/2, b, (b+c)/2, c, (c+b)/2, b, (b+a)/2, a, (a+0)/2]. Is there any
> elegant way of doing this without having to resort to clunky for loops?
>
> I also would like to repeat this action on the resulting vector.
>
> Thanks for any tips
>
> David
>
>

Hi,
1) get your "average".
nbEntries = n_elements(data)
avg = (data + shift(data,-1)) /2.0
2)add the 1st entry and correct the last entry:
avg = [data[0] / 2.0,avg]
avg[nbEntries] = data[nbEntries-1] / 2.0
3)create the new array by coping each original array, with a "step" of 2
cells betweens two values from the same original array
newData = fltarr(nbEntries*2+1)
nnewData[1:nbEntries*2:2] = data
newData[0:nbEntries*2:2] = avg

Jean

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[Message index]

		Re: array problems By: pgrigis on Fri, 11 July 2008 12:59
		Re: array problems By: jschwab@gmail.com on Fri, 11 July 2008 12:26
		Re: array problems By: Jean H. on Fri, 11 July 2008 12:02
		Re: array problems By: jschwab@gmail.com on Fri, 11 July 2008 12:20
		Re: array problems By: Vince Hradil on Fri, 11 July 2008 12:03
		Re: array problems By: Bob[3] on Mon, 14 July 2008 08:16
		Re: array problems By: David Sheerin on Tue, 15 July 2008 12:24

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