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correlation and NaN [message #55853]

Wed, 19 September 2007 00:08

WRC2008
Messages: 14
Registered: September 2007

Junior Member

Dear,

I would like to caclulate correlation factors from arrays which also
contains NaN values. Now, i checked some newsgroups and got answers
like this:

indices =[where( finite(Var1) eq 1),where( finite(Var2) eq 1)]
common_indices = indices(UNIQ(indices, sort(indices)))
Result = CORRELATE( Var1(common_indices), Var2(common_indices))

or with the another command (get_intersection?? - sorry, forgot the
right name, and can find it back anymore...)

The first doesn't seems to work in my case (r² = NaN), and the second
is not recognized in my IDL 5.6 version.
For the first method, maybe it is because one array doesn't contain a
NaN value???

Can anybody help me with this?
Thank you,

Best Regards,
Matthias

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