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

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

Subject |
RE: st: Re: How to eliminate the double quotes surrounding letters? |

Date |
Sat, 29 Aug 2009 17:09:20 +0100 |

That is the wrong way to think about the double quotes. In "ab cd ef" the " " are delimiters, showing where the string begins and ends: they are not part of the string, just as an envelope is not part of a letter. Why do you need the delimiters in Stata? One good reason, which is quite sufficient, is that if you refer to ab cd ef then in many Stata contexts it is expected that such strings are variable names (or scalar names). You need the " " in "ab cd ef" to make it clear whenever you have a literal string, not names of variables or scalars. In general, Stata automatically sees the delimiters and strips them off. You need do nothing to ensure that. Consider . di "ab cd ef" ab cd ef -display- strips the delimiters. Also consider what happens you go local foo = subinstr("Stata is good", "good", "excellent", .) The local -foo- ends up containing Stata is excellent If you in turn need to refer to that local, then you will need to refer to "`foo'" to make clear that a literal string is required -- unless you do have actually have variable names -Stata-, -is-, -excellent-! Nick n.j.cox@durham.ac.uk gjhxmu@sina.com Joseph, thank you very much for your help and I solved my problem by the method you suggested. By the way, is it a general way to deal with eliminating double quotes surrounding letters? Namely, is there a function applied in this situation? I tried -real()- function, however, I got a missing value. * * 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/

**References**:**Re: st: Re: How to eliminate the double quotes surrounding letters?***From:*gjhxmu@sina.com

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