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Re: st: For loops, If Statements and Delimiters


From   Joerg Luedicke <joerg.luedicke@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: For loops, If Statements and Delimiters
Date   Mon, 11 Feb 2013 15:01:48 -0500

Did you look at the -trace-? (-help trace-) Perhaps you could post an
excerpt of it.

Joerg

On Mon, Feb 11, 2013 at 2:54 PM, Ryan Stevens <stevrl7@gmail.com> wrote:
> I'm guessing that using Stata 12 should have no effect? Also, this is
> code I've extracted from a larger do file and changed a bit to make it
> more general. If you're getting it to work, maybe there's something
> going on with the rest of my do file that I'm unaware of. But I was
> hoping to see if anyone else had had similar issues with delimiters
> and for loops. Thanks both of you for responding so quickly.
>
> Ryan
>
> On Mon, Feb 11, 2013 at 2:48 PM, Joerg Luedicke
> <joerg.luedicke@gmail.com> wrote:
>> FWIW, I cannot replicate this. Running the following in Stata 11.2:
>>
>> *------------------------------------------
>> clear
>> set obs 100
>>
>> forval i=1/3 {
>>         gen var`i' = `i'
>> }
>>
>> # delimit ;
>> local j = 1;
>> foreach x of varlist var1-var3{;
>>        forval i = 1/12{;
>>              if(`j'<3){;
>>                  replace `x' = `x'[`i']-`x'[`j'] in `i';
>>                  local j = `j' + 1;
>>              };
>>              else{;
>>                  replace `x' = `x'[`i']-`x'[`j'] in `i';
>>                  local j = 3;
>>              };
>>         };
>> };
>>
>> *------------------------------------------
>>
>> works as expected:
>>
>> <snip>
>> - forval i = 1/12{
>> - if(`j'<3){
>> = if(1<3){
>> - replace `x' = `x'[`i']-`x'[`j'] in `i'
>> <snip>
>>
>> Joerg
>>
>> On Mon, Feb 11, 2013 at 2:41 PM, Nick Cox <njcoxstata@gmail.com> wrote:
>>> Any suggestion? Mine would include not using ; as a delimiter.   More
>>> positively, I would always put a space before each brace.
>>>
>>> My vague recollection is that there are some very obscure bugs that
>>> can bite with semi-colons, although a search did not turn up a precise
>>> post, but spaces before braces might be the territory.
>>>
>>> Nick
>>>
>>> On Mon, Feb 11, 2013 at 7:30 PM, Ryan Stevens <stevrl7@gmail.com> wrote:
>>>
>>>> I have been having an issue with using for loop and if statements
>>>> together with a semi-colon delimiter. The following is some example
>>>> code for the problem I've come across:
>>>>
>>>> # delimit ;
>>>> local j = 1;
>>>> foreach x of varlist var1-var3{;
>>>>        forval i = 1/12{;
>>>>              if(`j'<3){;
>>>>                  replace `x' = `x'[`i']-`x'[`j'] in `i';
>>>>                  local j = `j' + 1;
>>>>              };
>>>>              else{;
>>>>                  replace `x' = `x'[`i']-`x'[`j'] in `i';
>>>>                  local j = 3;
>>>>              };
>>>>         };
>>>> };
>>>>
>>>> Whenever I try running this I get an error on my if statement, where
>>>> Stata interprets "< 3" as a variable name. Any suggestions for loops
>>>> and if statements using delimiters would be greatly appreciated.
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