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Re: [ferret_users] average the positive and negative value seperately



Hi Changshui,

A simple way is to set them to two variables, i.e.,

let aa_pos = if aa ge 0 then aa else (-1e34)!or your missing value
let aa_neg = if aa lt 0 then aa else (-1e34)

Then you can do whatever average.

Cheers,
Tony

On Mon, 2010-08-16 at 09:30 +0800, Changshui Xia wrote:
> Dear All,
>  I have a variable in nc file which has  positive and negative values,
> how can i average the positive and negative value seperately using
> ferret?
> thank you.
>  
> Changshui



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