All--
Loading the whole dataset may hog memory, but
use in 1 using...
works fine, as shown in my previous post. -describe- would be
preferable, since it does not load the data in memory at all, but it
does not save a list of variables, and _describe is built-in, hence
not hackable. It would be possible to write a program that loads no
data and gets all the variable lists, either by parsing the output of
_describe using -file- commands, or as is Sergiy's wont, via a direct
file-access approach. But it wouldn't be nice if there were a Mata
command to get a view onto a dataset not in memory?
On Thu, Feb 19, 2009 at 11:24 AM, Johannes Geyer <[email protected]> wrote:
> what about:
>
> *************
> clear*
> sysuse auto, clear
> drop gear_ratio displacement
> save newauto, replace
> sysuse auto, clear
> qui ds
> loc first `r(varlist)'
>
> des using auto, varlist
>
> loc second `r(varlist)'
> loc diff: list first - second
> di in red "Differences: `diff'"
> *************
>
> -describe- does not need to load the dataset which may be of interest here
>
>
> Johannes
>
*
* For searches and help try:
* http://www.stata.com/help.cgi?search
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
