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Re: st: Re: saving memory local vs usual variable
Well, -egen- does not take more than one variable because usually that is
what users want: either the -max- of a variable or the max across columns,
which -egen- also supports with the -rowmax- option. If you want the maximum
of two vars for whatever reason:
sysuse auto, clear
tempvar prmax trmax overallmax
egen `prmax'=max(price)
egen `trmax'=max(trunk)
egen `overallmax'=rowmax(`prmax' `trmax')
su `overallmax',mean
loc max=r(max)
di in red `max'
HTH
Martin
_______________________
----- Original Message -----
From: "Ashim Kapoor" <[email protected]>
To: <[email protected]>
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 <[email protected]>
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 <[email protected]> wrote:
2008/10/3 Ashim Kapoor <[email protected]>:
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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