Re: [ferret_users] z range (z=zz:zzz) doesn't limit the plotting within the range

To: "Ansley C. Manke" <ansley.b.manke@xxxxxxxx>

Subject: Re: [ferret_users] z range (z=zz:zzz) doesn't limit the plotting within the range

From: Ryo Furue <furue@xxxxxxxxxx>

Date: Wed, 7 Mar 2018 12:45:00 +0900

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Hi Ansley,

Thank you, thank you.

On Wed, Mar 7, 2018 at 2:43 AM, Ansley C. Manke <ansley.b.manke@xxxxxxxx> wrote:

The VECTOR/Y= /Z= qualifiers are used to choose the subset of the data that will be sent to the plotting command. With this dataset, the coordinate value of the grid box that contains z=900 is 915.4, so the subset of data that you've requested includes data at z=289, 320, ..., 915.4.

I'm surprised! So, the Z= qualifier and the range like VAR[Z=0:900] choose the gridpoints by the grid boxes! I thought the range chooses the gridpoints within the range.

That is subtle.

What's the most general way to choose gridpoints within the range. Perhaps

let var_new = if z[gz=var] ge 0 and z[gz=var] le 900 then var

Regards,

Ryo