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From |
Jeph Herrin <stata@spandrel.net> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: macro problem |

Date |
Mon, 11 Jun 2012 15:04:54 -0400 |

. local list "a b" "b c" "c d" . foreach s in `list' { 2. di "`s'" 3. } a b b c c d . local list "a" "b" . foreach s in `list' { 2. di `"`s'"' 3. } a" b (note the trailing " on the -a-) and so on. cheers, Jeph On 6/11/2012 12:29 PM, Nick Cox wrote:

" " have two roles in Stata; they act as string delimiters (which by default are stripped) and they act as literal characters which you want to preserve as part of a string (in which you often need `" "' as delimiters). However, this works . foreach s in "a b" "b c" "c d" { 2. di "`s'" 3. } a b b c c d so maybe something simpler would also work for you. Nick n.j.cox@durham.ac.uk Jeph Herrin There is no problem with -strpos-, which never returns missing and which is zero exactly when I want it to be. The problem was in creating the original macro and then referencing the elements so that they appear in -strpos- with the correct number of quotations marks; I was achieving either too many or too few of the latter. The solution (or at least, a solution) is for local -matchlist- needed to be enclosed in compound quotes, and then ditto the reference: local matchlist `""string 1" "string 2" "string 3" .... "string 55""' gen byte match=0 foreach S of local matchlist { replace match = 1 if strpos(strvar,`"`S'"') } The reference in -strpos- looks wrong to me - I would anticipate that `S' would include the necessary "'s for -strpos-, but it does not. Without the extra quotes on the original local, however, `"`S'"' resolves to include too many "'s. On 6/11/2012 11:58 AM, Richard Goldstein wrote:you don't make it clear about what doesn't work but here is a guess: you are getting match=1 in all cases (or at least all where strvar is not missing); remember, however, that strpos=0 if "S" is not found; so, in addition to the quotes, etc., I guess you want to ensure that strpos is>0 (and maybe<.)On 6/11/12 11:50 AM, Jeph Herrin wrote:This should be trivial, but for some reason I cannot get it. I have a string variable, and I have a list of string values I need to match against it. There are occasional trailing or leading characters in the variable, so I am using -strpos- to find matches. Thus local matchlist "string 1" "string 2" "string 3" .... "string 55" gen byte match=0 foreach S in `matchlist' { replace match = 1 if strpos(strvar,`S') } Now, I know I have got the quotes and macro evaluations wrong, but that is the problem: I've tried this many different ways, and yet cannot seem to find a combination that works. Any thoughts?* * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

* * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**Re: st: macro problem***From:*Nick Cox <njcoxstata@gmail.com>

**References**:**st: macro problem***From:*Jeph Herrin <stata@spandrel.net>

**Re: st: macro problem***From:*Richard Goldstein <richgold@ix.netcom.com>

**Re: st: macro problem***From:*Jeph Herrin <stata@spandrel.net>

**RE: st: macro problem***From:*Nick Cox <n.j.cox@durham.ac.uk>

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