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From |
Nick Cox <n.j.cox@durham.ac.uk> |

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

Subject |
st: RE: work with larger string length |

Date |
Tue, 27 Mar 2012 17:14:23 +0100 |

First taking your questions one by one: 1. since string limit is 244, what is it about extended function subinstr that makes string limitation non issue. Does extended function increase the acceptable string length which I think is unlikely? I don't know what kind of answer you expect here, but the short answer is yes. It is a fact that using -subinstr()- rather than -: subinstr- bites as the limit on the length of strings in string expressions is 244 in all current flavours of Stata. See -help on limits-. I can't expand on why Stata is written this way; that's an interesting question to me too. 2. looks like the same question to me. 3. when I use length command to find the length of the string in stata12, I get unrecognized command. Any idea. Works for me. I can't say what you did wrong, as you don't show any example code. . di length("frog") 4 Now I want to comment on your code foreach x of varlist hits* { gen temp=`x' replace `x'=. egen tot_`x'=rowtotal(hits*) replace `x'=temp drop temp } A better solution (in my view) is implied by advice given earlier in the thread you started previously. unab hitlist : hits* foreach x of local hitlist { local thislist : list hitlist - x egen tot_`x' = rowtotal(`thislist') } Nick n.j.cox@durham.ac.uk tashi lama I posted a question related to this earlier and received favorable answers although I am not sure if I completely understand the science. I have dared to post this question again. Any help will be highly appreciated. I have a dataset of some 48 variables and the nature of my problem obliges me to have all variables start with hit. when I ran this code, foreach x of varlist hit* { local varlist_new=subinstr("`varlist'", "`x'","",1) di "`varlist_new'" egen tot_`x'=rowtotal(`varlist_new') } The problem was I did get answers but the upon close analysis, the answers were incorrect. I am assuming it must be because the length of my string variables exceed 244. Now, I was advised to use extended subinstr function, which seem to work. Further I wrote a code below, which also works. foreach x of varlist hits* { gen temp=`x' replace `x'=. egen tot_`x'=rowtotal(hits*) replace `x'=temp drop temp } My question is 1. since string limit is 244, what is it about extended function subinstr that makes string limitation non issue. Does extended function increase the acceptable string length which I think is unlikely? 2. The code without subinstr works and again, it sounds like string limitation is a non issue. Again, is the code increasing the accepateble length of the string?? 3. when I use length command to find the length of the string in stata12, I get unrecognized command. Any idea. * * 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: RE: work with larger string length***From:*tashi lama <ltashi32@hotmail.com>

**References**:**st: work with larger string length***From:*tashi lama <ltashi32@hotmail.com>

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