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least square matrix [message #43027]

Fri, 11 March 2005 01:33

Matthias Demuzere
Messages: 9
Registered: April 2004

Junior Member

Hi,

Because my question maybe still a bit unclear, here it is again:

I have a dataset of temperatures taken at hourly steps (k-value, ranging
from 1-24) for a whole
month (with i days). Now, I would like to compare each temperature Tk,i with
every other Tk,j with j the same number of days as in i. I would like to do
that comparison by least square methods like this

Matrix Ai,j = sum (Tk,i-Tk,j)^2

where the matrix Ai,j is a symmetrical matrix (because i,j are the same
day).

How can that be done in IDL?

I was thinking of some FOR statements, like this:

FOR i=1, i LE 31, i++ DO BEGIN
FOR j=1, j LE 31, j++ DO BEGIN
FOR k=1, k LE 24, k++ DO BEGIN
function
ENDFOR
ENDFOR
ENDFOR

But this doesn't seems to work really...Any idees, tips,...??

Thanks,
Matthias

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[Message index]

		least square matrix By: Matthias Demuzere on Fri, 11 March 2005 01:33
		Re: LEAST SQUARE MATRIX By: Matthias Demuzere on Wed, 09 March 2005 09:13
		Re: LEAST SQUARE MATRIX By: James Kuyper on Wed, 09 March 2005 08:53

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