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From |
Grace Jessie <gracejessie@hotmail.com> |

To |
<statalist@hsphsun2.harvard.edu> |

Subject |
RE: st: string function |

Date |
Wed, 24 Aug 2011 11:50:09 +0000 |

OK,thank you, Nick. Grace ---------------------------------------- > Date: Wed, 24 Aug 2011 12:37:23 +0100 > Subject: Re: st: string function > From: njcoxstata@gmail.com > To: statalist@hsphsun2.harvard.edu > > I just said that they _could_ be written. > > At that time, I had forgotten about -egen- solutions for your first > problem in -egenmore- (SSC). Both of those solutions (by Nick Winter > and myself) overlooked what now seems to me a cleaner solution using > -subinstr()- and -length()-. See also > > <http://statadaily.wordpress.com/2011/01/20/counting-occurrence-of-strings-within-strings/> > > and my Speaking Stata column in SJ 11(1) 2011 for discussion. > > I am not aware of coded -egen- solutions for your other problems. > > I imagine that they would just be wrappers for those -foreach- loops, > with no gain in efficiency or even comprehensibility. > > I'm setting them as an exercise for homework. > > Nick > > 2011/8/24 Grace Jessie <gracejessie@hotmail.com>: > > Nick, > > thank you. > > Counld you please also tell me the -egen- solution for my questions? > > > > Grace > > > > ---------------------------------------- > >> Date: Wed, 24 Aug 2011 11:59:19 +0100 > >> Subject: Re: st: string function > >> From: njcoxstata@gmail.com > >> To: statalist@hsphsun2.harvard.edu > >> > >> Solutions to all these could be written as -egen- functions or Mata functions. > >> > >> Here I focus on "official Stata only" solutions. > >> > >> First question is discussed in > >> > >> Nicholas J. Cox > >> Stata tip 98: Counting substrings within strings > >> The Stata Journal 11(2): 318-320 > >> > >> length("abcdaf") - length(subinstr("abcdaf", "a", "", .)) > >> > >> Last two questions > >> > >> any of "a", "b", "c" > >> > >> max(strpos("abcdaf","a"), strpos("abcdaf", "b"), strpos("abcdaf", "c")) > 0 > >> > >> all of "a", "b", "c" > >> > >> min(strpos("abcdaf","a"), strpos("abcdaf", "b"), strpos("abcdaf", "c")) > 0 > >> > >> If you had a long list of candidates, I would do something like this: > >> > >> gen found = 0 > >> > >> qui foreach letter in s o m e t h i n g { > >> replace found = max(found, strpos(strvar, "`letter'") > 0) > >> } > >> > >> where for "max" substitute "min" as needed. > >> > >> The mapping max <-> any, min <-> all is discussed in > >> http://www.stata.com/support/faqs/data/anyall.html > >> > >> Nick > >> > >> 2011/8/24 Grace Jessie <gracejessie@hotmail.com>: > >> > >> > How to count how many times a substring appears in a string? > >> > For example, > >> > function("abcdaf","a")=2 > >> > > >> > And, how to check if a string variable has certain substrings? > >> > With regard to this, I want to ask two functions. > >> > For example, > >> > function("abcdaf","a","b","c") > >> > One of what I want to do is to return 1 if a or b or c is included in "abcdaf", ; > >> > the other is to return 1 if a, b and c are included in "abcdaf". > >> > Could anyone tell me the correct functions for thoes above? > >> * > >> * 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/ > > > > * > * 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: string function***From:*Nick Cox <njcoxstata@gmail.com>

**References**:**st: string function***From:*Grace Jessie <gracejessie@hotmail.com>

**Re: st: string function***From:*Nick Cox <njcoxstata@gmail.com>

**RE: st: string function***From:*Grace Jessie <gracejessie@hotmail.com>

**Re: st: string function***From:*Nick Cox <njcoxstata@gmail.com>

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