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Re: st: the use of foreach command in Stata


From   Rosie Chen <jiarongchen2002@yahoo.com>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: the use of foreach command in Stata
Date   Wed, 14 Mar 2012 18:23:23 -0700 (PDT)

Nick, sorry that I didn't see your response to Till earlier. If using `var' instead of lname is ok, then I guess my question is:  how can I save all the histogram graphs and track back all the graphs? Stata only showed the last graph to me. Thank you, 

________________________________
From: Nick Cox <njcoxstata@gmail.com>
To: statalist@hsphsun2.harvard.edu 
Sent: Tuesday, March 13, 2012 3:13 PM
Subject: Re: st: the use of loop function in Stata

As before I recommend against using the term "loop function". You are
using the -foreach- command. It's not a function (Stata sense).
"Looping with -foreach- " also makes sense.

The reason this doesn't work is that "lnamelist" is not a keyword
recognised by -foreach-: look again at the help.

Till actually recommended something different from what you typed:

foreach lname in lnamelist

but that is also illegal, except in very special circumstances, a loop
with just one literal name "lnamelist". I didn't spot in my earlier
reply that Till's suggestion was illegal (except in very special
circumstances).

Nick

On Tue, Mar 13, 2012 at 6:50 PM, Rosie Chen <jiarongchen2002@yahoo.com> wrote:
> Thank you, Steve and Till. Below is the revised syntax, but I got an error message
of "variable lnamelist not
found".  Isn't lp* the list? This is the first time I use the loop function, so any suggestion would be appreciated.
>
> foreach lname in lnamelist lp*{
> histogram `lname',  by(AI4, col(1))
> graph save histogram`lname', replace
> }
>
>
> ----- Original Message -----
> From: Steve Nakoneshny <scnakone@ucalgary.ca>
> To: "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
> Cc:
> Sent: Tuesday, March 13, 2012 11:28 AM
> Subject: Re: st: the use of loop function in
Stata
>
> You will also need to add the -replace- option to the histogram
command.
>
> On 2012-03-13, at 8:44 AM, Dr. Till Ittermann wrote:
>
>> Hi,
>>
>> I would loop over lname not var:
>>
>> foreach lname in lnamelist {
>> histogram `lname',  by(AID4, col(1))
>> graph save histogram`lname'
>> }
>>
>>
>>
>> m 13.03.2012 15:36, schrieb Rosie Chen:
>>>
Nick, thank you very much for the further advice, which makes the 
syntax more efficient. Given the loop syntax I have, how to save all the
histogram graphs? If I use the code below, the error message says: 
"file histogram.gph already exists".
>>>
>>>
>>> foreach var of varlist lp*{
>>>
>>>     histogram `var',  by(AID4, col(1))
>>>
>>>     graph save histogram
>>> }
>>>

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