Re: [ferret_users] Masking Issue

To: ferret_users@xxxxxxxx

Subject: Re: [ferret_users] Masking Issue

From: Russ Fiedler <russell.fiedler@xxxxxxxx>

Date: Mon, 7 Jan 2019 10:06:43 +1100

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Hi Deni,

You can shift the time of the event mask using the L=@SHF:n transformation. This just moves the values forward or backward in time. In your case

let/title="12 months before the evant" event_12 = event[L=@shf:12]

In your specific example it will move the first event off the time axis so you may have to make an extended time axis with nothing but missing values if you need that first event.

Cheers,

Russ

On 6/1/19 12:24 pm, Deni Okta Lestari wrote:

Dear ferret users,

I am trying to masking index for 12 months before the event. I can't find any command in the official of ferret because it's unavailable. So, what is the command to issue this masking?

yes? list index, event

   TIME: 01-JAN-1982 00:00 to 01-JAN-2018 00:00

   LONGITUDE: 150W to 90W

   LATITUDE: 5S to 5N

Column 1: INDEX

Column 2: EVENT

INDEX EVENT

01-JAN-1982 00 / 1: -0.900 ....

01-FEB-1982 00 / 2: -1.135 ....

01-MAR-1982 00 / 3: -0.118 ....

01-APR-1982 00 / 4: 1.238 ....

01-MAY-1982 00 / 5: 2.153 ....

01-JUN-1982 00 / 6: 2.450 ....

01-JUL-1982 00 / 7: 1.498 ....

01-AUG-1982 00 / 8: 1.263 ....

01-SEP-1982 00 / 9: 1.542 ....

01-OCT-1982 00 / 10: 1.944 ....

01-NOV-1982 00 / 11: 2.732 ....

01-DEC-1982 00 / 12: 2.692 1.000

01-JAN-1983 00 / 13: 2.142 ....

01-FEB-1983 00 / 14: 1.404 ....

01-MAR-1983 00 / 15: 2.001 ....

01-APR-1983 00 / 16: 2.676 ....

01-MAY-1983 00 / 17: 3.337 ....

01-JUN-1983 00 / 18: 3.136 ....

01-JUL-1983 00 / 19: 1.677 ....

01-AUG-1983 00 / 20: 0.984 ....

01-SEP-1983 00 / 21: 0.260 ....

01-OCT-1983 00 / 22: -0.554 ....

01-NOV-1983 00 / 23: -0.717 ....

01-DEC-1983 00 / 24: -1.264 ....

Best regards,

Deni
--

Deni Okta Lestari

Ilmu Lingkungan

Program Pascasarjana Universitas Sriwijaya

Email: deni.oktalestari28@xxxxxxxxx

Mobile:+62-852-6758-0477

References:

[ferret_users] Masking Issue
- From: Deni Okta Lestari