[ferret_users] average the positive and negative value seperately

To: ferret_users@xxxxxxxx
Subject: [ferret_users] average the positive and negative value seperately
From: Changshui Xia <xiacs@xxxxxxxxxx>
Date: Mon, 16 Aug 2010 09:30:53 +0800
Sender: owner-ferret_users@xxxxxxxx

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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