I note from this that you have privately modified
my program -fixsort- and now want advice on why
it still works.
The Statalist FAQ implies that once you modify a
program, it is then yours and you are responsible
In this case, specifying -version 9- arose
because of the internal use of the -clonevar-
command. This was introduced in the lifetime
of Stata 8, so anyone who has updated Stata
8 after 5 October 2004 should be in your situation:
they can hack at the program and have the outcome
Setting -version 9- is far from the only solution here
but it was the laziest at the time I wrote -fixsort-.
The situation with -blist- is different. The
description at http://ideas.repec.org/c/boc/bocode/s419301.html
is simply out-of-date in stating Stata 7, as the code
now there specifies Stata 9, although my guess
is that Stata 8 would be sufficient. The one
detail here I noticed is whether a type must be specified
in -generate-ing a new string variable. I can't comment
When you say that
the required version represents the minimum
requirements needed by the command to work
this is indeed the main idea. But it is also
possible for a programmer to specify, whether
by accident or design, either a version that
is higher than this or a version that is lower
than this. This could arise for all sorts of
reasons. Here are three examples. They are far
1. A programmer is developing a program under
Stata 9. They thus believe that it works under
Stata 9. They have no time or interest in
going back to Stata 8, or another version,
to check that it would also work under that
version. Perhaps it will, perhaps it won't, but
they can't bothered to check that out.
2. Perhaps the help file was developed for
a later version. That is, the program might
work in an earlier version, but the help file
won't show properly because it uses a later
version of SMCL.
3. A programmer could set say -version 8-
and then accidentally use some
feature of version 9 -- and not notice
that -version 9- is required. This
is the opposite of #1.
Otherwise put, programmers are busy people
too and often make short-cuts or consider
their own convenience.
Roberto De Miguel
> Making - ssc whatsnew - I found the command "blist"
> module to list values of variables in as small a space as possible
> Authors: Adrian Mander Req: Stata version 7.0
> Revised: 2005-07-31
> For my surprise, although it said: Req: Stata version 7.0,
> when attempting
> to use it requested the version 9 of Stata.
> Looking at the ado, I found that if I changed the line "version 9.0"
> meetly, it also runs in a previous version of Stata.
> Something similar happened to me with the "fixsort" command
> that although
> it require the version 9.0 can be used in a previous version changing
> the line that declares the version in the ado
> module to sort variables and align in sorted order, with others fixed
> Authors: Nicholas J. Cox Req: Stata version 9.0
> Created: 2005-08-02
> I always understood that the required version represent the minuimum
> requirements needed by the command to work. Isn't this correct?
> Can somebody clear up this point?
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