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Re: st: For loops, If Statements and Delimiters
From
Jeph Herrin <[email protected]>
To
[email protected]
Subject
Re: st: For loops, If Statements and Delimiters
Date
Tue, 12 Feb 2013 10:09:35 -0500
This happens about once a month or so to me - I isolate a code fragment
containing macro evaluation that produces an error that I cannot
identify. I cut, save, paste, save, and it works. I use -vim- for
editing, which is robust to displaying stray control characters etc, so
I have never really determined what causes it.
However, I usually only use ; to delimit large matrices or arrays stored
as macros, so it isn't related to that.
cheers,
Jeph
On 2/11/2013 3:24 PM, Ryan Stevens wrote:
So I just re-pasted the code I typed for the email, and adapted it for
the do file and everything is working fine. I'm still a little dumb
founded on where the actual error lay, I think it was some spacing
issues with my semi-colons.
On Mon, Feb 11, 2013 at 3:01 PM, Joerg Luedicke
<[email protected]> wrote:
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 <[email protected]> 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
<[email protected]> 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 <[email protected]> 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 <[email protected]> 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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