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Re: st: workaround for macro length problem with levelsof() ?


From   Keith Dear <keith.dear@anu.edu.au>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: workaround for macro length problem with levelsof() ?
Date   Sun, 24 Feb 2008 09:35:05 +1100

Dan,
Instead of
local filepath = "c:/mydata/`name'"
try simply
local filepath c:/mydata/`name'

The point is that the = unnecessarily evaluates the subsequent expression as a string, before assigning it to the local macro, and strings are indeed limited to 244 characters (this has come up here several times recently).

Also instead of -clear-, -drop _all- may be enough. I don't know if it matters here.
Keith


At 08:56 AM 24/02/2008, you wrote:

Statalist,

I am trying to access a series of files using the values of a variable in
another dataset to as an index of the names of the files.  This is easy to
do with ­levelsof-, except that the macro is truncated at a very small
number of characters (244?).

Here is what I’d like to do:

clear
insheet using sp_components.csv
keep v1
levelsof(v1), local(namelist)

foreach name of local namelist {
        clear
        local filepath = "c:/mydata/"`name'"
        insheet using "`filepath'"
        ...
        }


Since I need to clear memory each time, there is no easy workaround that I
can see using -forvalues-
I can't help but think that -levelsof- wouldn't bother to generate the nice
long list that it does if there weren't some way to use it.  Am I missing
something?

Thanks.

Dan


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