[ferret_users] converting Horizontal time axis to read pentads

To: ferret_users <ferret_users@xxxxxxxx>

Subject: [ferret_users] converting Horizontal time axis to read pentads

From: afwande juliet <afwandej965@xxxxxxxxx>

Date: Sun, 21 May 2017 23:10:08 +0300

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Dear ALL ferreters

I am calculating pentad rainfall. I have 19 rainfall pentads within 3months. I want my horizontal time axis to read pentad1, pentad2 pentad3 .................pentad19 instead of the days.

I tried this but got the error
define axis/t/t0=pentads/edges/units=pentads taxis_new_pentads
*** NOTE: (fyi) units are not subject to auto-conversion: PENTADS
**ERROR: improper grid or axis definition: error in start,end,delta

I checked this http://ferret.pmel.noaa.gov/Ferret/documentation/users-guide/commands-reference/DEFINE#_VPINDEXENTRY_1306

but coud not find what I want

Anybody with help around this would appreciate