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reading old code... why would one do this? [message #68458]

Thu, 22 October 2009 14:36

wallabadah
Messages: 28
Registered: November 2005

Junior Member

Hi All,

I'm in the process of reviewing and rewriting some old routines I
inherited... and I've come across the following code snippet:

a = svdfit(x, y, fitting_order + 1, measure_errors = e, $
variance = var, chisq = c)
; this line added to give results consistent with IDL pre 5.4
var = var * c

I'm a bit worried about the last line - I don't have access to IDL
documentation pre version 6.1, so I have two questions...
- was there some change in the output of svdfit that would require
such an 'adjustment' of the variance value?
- if not - maybe the statistics gurus can tell me if variance * chisq
has some mystical statistical meaning that I'm missing

cheers,

Will.

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