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Re: st: Show Command Output in Foreach Loop ...


From   Sergiy Radyakin <serjradyakin@gmail.com>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: Show Command Output in Foreach Loop ...
Date   Fri, 5 Jul 2013 00:49:21 -0400

Mike,
you will find the answer to your first question here:
http://www.stata.com/help.cgi?quotes

For the second question the answer is that `cmd' is just the value of
macro cmd. You can substitute the letters cmd with xyz or abc, you
will get the same result. It does not have to be a regression.
Furthermore it does not have to be displayed with -display-. This is
just to say "I have a command that Stata is about to execute, is there
anything else useful I want to do with it before or after Stata
actually executes it?"

Hope this helps, Sergiy

On Thu, Jul 4, 2013 at 10:54 PM, Michael Stewart
<michaelstewartresearch@gmail.com> wrote:
> Hi,
>
> I am trying to understand the  code written by Sergiy.I have couple of
> questions .I hope someone can answer them.Thank you in advance for
> your time and consideration.Sorry, they might be basic questions for
> the  expert programmers in this forum.
>
>
> sysuse auto,clear
> levelsof rep78, local(levs)
> foreach lev in `levs' {
>   local cmd `"regress price weight if rep78==`lev'"'
>   display `"`cmd'"'
>   `cmd'
> }
>
> Question-1:
>
> Does it matter if we substitute  local cmd regress price weight if
> rep78==`lev'     for    local cmd `"regress price weight if
> rep78==`lev'"'
>
> I am getting the same result  or am I missing something
>
> Likewise I am getting same result with display `"`cmd'"' OR  display
> "`cmd'".Is there any difference between the two or am I missing
> something
>
>
> Question-2:
>
> How does the command   `cmd'   work.It seems to be display the regression output
>
> Thanks a lot for your time.
>
> --
> Yours Sincerely,
> Mike.
>
> On Mon, Jul 1, 2013 at 2:07 AM, Sergiy Radyakin <serjradyakin@gmail.com> wrote:
>> Matthew, it has been an observation in this list that you get a much
>> higher chances of getting responses and faster responses if you
>> supplement your question with a starter like this:
>>
>> sysuse auto
>> levelsof rep78, local(levs)
>> foreach lev in `levs' {
>>   regress price weight if rep78==`lev'
>> }
>> ** eof
>>
>> Then all one has to do is a little edit to the code to get the answer you seek:
>>
>> sysuse auto
>> levelsof rep78, local(levs)
>> foreach lev in `levs' {
>>   local cmd `"regress price weight if rep78==`lev'"'
>>   display `"`cmd'"'
>>   `cmd'
>> }
>> ** eof
>>
>> Best, Sergiy
>>
>>
>>
>> On Sun, Jun 30, 2013 at 10:31 PM, Matthew McKay
>> <matthew.mckay@anu.edu.au> wrote:
>>> Statalist,
>>>
>>> I have seen a few earlier remarks in 2007 about showing commands during foreach loops.
>>> Option 1:
>>> Set trace on
>>> Set tracedepth 1
>>> This doesn't work that well for me as it clumps the commands together and then the regression output together.
>>>
>>> Since then, is there a better way to show the issued command during a foreach loop?
>>> Why can't it just simply show the executed lines and the regression as if the code was running outside of a foreach loop in one long sequence?
>>>
>>> I have multiple datasets that I would like to run the same extensive set of analysis on.
>>> The smcl log file output is not very reader friendly without the command breaks printed in between each regression.
>>>
>>> Cheers,
>>> Matthew
>>> Phd Student
>>> ACDE, Crawford School
>>>
>>>
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