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[ferret_users] shf transformation



Dear ferrets,
I have a question concerning the shf transformation:

let sum_plus = temp+temp[j=@shf+1]
list sum_plus[j=500]
5.466
list temp[j=500]+temp[j=501]
5.466
ok, all fine.

BUT:
let sum_minus = temp+temp[j=@shf-1]
list sum_minus[j=500]
5.466

gives the same as above and not:
list temp[j=500]+temp[j=499]

5.268

Why is it set up this way ? Or am I missing something ?

thanks! Alexa

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