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From |
Nick Cox <njcoxstata@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: 2 questions on function wordcount |

Date |
Thu, 3 May 2012 17:59:31 +0100 |

To spell this out (the number 6 here is just the number of variables in a currently open Stata) . unab vlist : * . di `: word count `vlist'' 6 . di c(k) 6 i.e. note also that the number of variables in memory is directly accessible in c(k). So, this is a one way to do it in this case . di "`: word `c(k)' of `vlist''" group More generally . local k `: word count `vlist'' . di "`: word `k' of `vlist''" The last could be telescoped into one line, with some cost in readability. Note that the limit that bites here is not on macro length, but on the length of string in a string expression. Nick On Thu, May 3, 2012 at 5:39 PM, Austin Nichols <austinnichols@gmail.com> wrote: > Gregorio <GImpavido@imf.org>: > wordcount() will truncate the string at 255 characters. Instead use > -local- tricks described at > help extended_fcn On Thu, May 3, 2012 at 12:34 PM, Impavido, Gregorio <GImpavido@imf.org> wrote: >> The following two examples should give the same result but they don't. >> >> /*-------begin 1 ---------*/ >> unab vlist : * >> di wordcount(`"`vlist'"') >> /*-------end 1 ---------*/ >> >> /*-------begin 2 ---------*/ >> unab vlist : * >> local i 0 >> foreach var of local vlist { >> local i = `i' + 1 >> } >> di `i' >> /*-------end 2 ---------*/ >> >> In my case, wordcount gives me a different result depending on how I rename the variables in the dataset while the second gives me always 170 (which happens to be the number of variables in the dataset. >> >> Question 1. Is this related to the length limitation of the local macro? But if Yes, why is the macro vlist not truncated? >> >> Question 2. Is there a quicker way to do display the last word in vlist (i.e., -di word((`"`vlist'"',wordcount(`"`vlist'"'))-) than using example 2 above to extract the number of the last variable? * * 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: 2 questions on function wordcount***From:*"Impavido, Gregorio" <GImpavido@imf.org>

**References**:**st: 2 questions on function wordcount***From:*"Impavido, Gregorio" <GImpavido@imf.org>

**Re: st: 2 questions on function wordcount***From:*Austin Nichols <austinnichols@gmail.com>

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