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Re: st: modifying egen to add a replace feature


From   William Buchanan <william@williambuchanan.net>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: modifying egen to add a replace feature
Date   Thu, 19 Jul 2012 07:12:58 -0700

You might try using -egen- to create a series of -tempvars- that you combine into a single variable after all the computations.  Either way, it would probably be helpful if you share the solution that works for you with the list since others have probably had similar issues.

HTH,
Billy

Sent from my iPhone

On Jul 19, 2012, at 6:36, Pradipto Banerjee <pradipto.banerjee@adainvestments.com> wrote:

> That's exactly the issue I had. I had tried to use -replace- as an option, but Stata threw a error message saying that the variable is already defined.
> 
> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Nick Cox
> Sent: Thursday, July 19, 2012 4:09 AM
> To: statalist@hsphsun2.harvard.edu
> Subject: Re: st: modifying egen to add a replace feature
> 
> Not so. Writing a new -egen- function so that it takes a -replace-
> option is not the issue here. -egen- will throw out the call if -y- is
> an existing variable before the function code is even entered. The
> issue is cloning -egen- to do the replacement.
> 
> As I've signalled elsewhere, I think  it is easiest just to -drop-
> what you don't want and/or do a -replace- afterwards.
> 
> Nick
> 
> On Thu, Jul 19, 2012 at 8:13 AM, Maarten Buis <maartenlbuis@gmail.com> wrote:
>> On Wed, Jul 18, 2012 at 5:00 PM, Pradipto Banerjee wrote:
>>> Is it possible to rewrite or modify egen, or create an ado file, such that I can simply write like this:
>>> 
>>> bysort x: egen y = myfunc (y, a, b, ...), replace
>> 
>> Yes, the logic behind the way -egen- works is that if you type -egen y
>> = myfunc()-, -egen- will look for a file _gmyfunc.ado, which
>> implements the function myfunc() and it also passes the option you
>> have specified to that .ado file. So you can write your own -egen-
>> functions. The easiest way to get started is to look at an existing
>> similar function and addept that, e.g. look at -viewsource _gmean.ado.
>> 
>> 
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