On Sun, Jan 17, 2016 at 7:00 PM, <gretl-users-request@lists.wfu.edu> wrote:

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Today's Topics:

   1. generating a series from the ID numbers? (cociuba mihai)
   2. Re: generating a series from the ID numbers? (Allin Cottrell)


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Message: 1
Date: Sun, 17 Jan 2016 13:31:21 +0200
From: cociuba mihai <cociuba@gmail.com>
To: gretl-users@lists.wfu.edu
Subject: [Gretl-users] generating a series from the ID numbers?
Message-ID:
        <CADSiGnWQPRNzpN+53UpKxmvDfAGgqi3UkRwgeCjKEUU6wtJRpg@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"

The help for "series" says " In the context of a genr formula, existing
variables must be referenced by name, not ID number." but using the id of a
series is possible with other commands like "print". Is there any
possibilities to generate a series from the ID's?
<hansl>
open andy.gdt
print 1
# the help for "series" says " In the context of a genr formula, existing
variables must be referenced by name, not ID number."
# but using the id of a series is possible with other commands
series test= sales - price

# so isn't it possible to have something like
# series test2 = id[1]-id[2]
print test
print 4
<hansl>

Best regards,
Mihai
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Message: 2
Date: Sun, 17 Jan 2016 09:38:41 -0500 (EST)
From: Allin Cottrell <cottrell@wfu.edu>
To: Gretl list <gretl-users@lists.wfu.edu>
Subject: Re: [Gretl-users] generating a series from the ID numbers?
Message-ID: <alpine.LFD.2.20.3.1601170930150.2387@myrtle.attlocal.net>
Content-Type: text/plain; charset=US-ASCII; format=flowed

On Sun, 17 Jan 2016, cociuba mihai wrote:

> The help for "series" says " In the context of a genr formula, existing
> variables must be referenced by name, not ID number." but using the id of a
> series is possible with other commands like "print". Is there any
> possibilities to generate a series from the ID's?

Not directly, but see below.

> <hansl>
> open andy.gdt
> print 1
> # the help for "series" says " In the context of a genr formula, existing
> variables must be referenced by name, not ID number."
> # but using the id of a series is possible with other commands
> series test= sales - price
>
> # so isn't it possible to have something like
> # series test2 = id[1]-id[2]
[...]
> <hansl>

There's a varname() function but that won't do what you want:

series test2 = varname(1) - varname(2)

will fail since the value yielded by "varname(1)" is a string, not a
series. The way to do it is by using a list:

<hansl>
open data4-1.gdt
series test = price - sqft
list ID = dataset
series test2 = ID[1] - ID[2]
print test test2 -o
</hansl>

Allin Cottrell


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