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Re: st: Re: saving memory local vs usual variable


From   "Martin Weiss" <martin.weiss1@gmx.de>
To   <statalist@hsphsun2.harvard.edu>
Subject   Re: st: Re: saving memory local vs usual variable
Date   Fri, 3 Oct 2008 20:11:00 +0200

Both Ashim and Fabian Brenner could probably profit from Nick`s comprehensive post at

http://www.stata.com/statalist/archive/2008-08/msg01258.html

This posts would, btw, also look good in the FAQ section for more convenient reference...

HTH
Martin
_______________________
----- Original Message ----- From: "Ashim Kapoor" <ashimkapoor@gmail.com>
To: <statalist@hsphsun2.harvard.edu>
Sent: Friday, October 03, 2008 6:59 PM
Subject: Re: st: Re: saving memory local vs usual variable



On 2nd thought.

egen j=max(x) DOES NOT take more than one variable.

It is gen which can do the max of 2 or more variables.

So since egen returns a variable with ONE constant value, it would
seem that it should be allowed to be stored in a scalar / local macro.

Thank you,
Ashim.

On Fri, Oct 3, 2008 at 10:26 PM, Ashim Kapoor <ashimkapoor@gmail.com> wrote:

Ahh I see what you are saying. For multiple variables it won't work. I
usually use it to find the max of ONE variable. I guess that confused
me.

Thank you,
Ashim.

On Fri, Oct 3, 2008 at 10:21 PM, Eva Poen <eva.poen@gmail.com> wrote:
2008/10/3 Ashim Kapoor <ashimkapoor@gmail.com>:
And I am still puzzled as to why someone would not allow us to set
local  j=max(list)
cos that seems intuitive.
If the list includes variable names, how is Stata supposed to know
which observation's maximum you mean? -egen- is meant to work with
variables. -egen- functions are not available outside -egen.

On the other hand, there are Stata functions (-help functions-) which
will work in general expressions. Therefore,

local j = max(4, 92, -35, 399, 0)

will correctly store 399 in local macro j.

Eva
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