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From |
"Martin Weiss" <martin.weiss1@gmx.de> |

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

Subject |
AW: Re: AW: st: How to use the marco names? |

Date |
Thu, 6 Aug 2009 17:22:12 +0200 |

<> The third one does not watch out for "the contents of the names". It notes that there is no indication of a string here, so by default it looks for variables named a, b, c whose first value it would -display- by default... *** clear* set obs 10000 gen a=1 gen b=2 gen c=3 replace a=3 in 1 replace b=4 in 1 replace c=5 in 1 local level a b c di "`level'" di `"level"' di `level' *** HTH Martin -----Ursprüngliche Nachricht----- Von: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von gjhxmu@sina.com Gesendet: Donnerstag, 6. August 2009 17:15 An: statalist Betreff: Re: Re: AW: st: How to use the marco names? Nick, thank you for your help, which lets me understand more. I suddenly think of the following typing, .local level a b c . di "`level'" a b c . di `"level"' level . di `level' a not found r(111); If -di- is to display literal strings or the contents of the names supplied, the results for the above three should be, `level' // literal string error // no local name "level",but local name level. a b c // the contents of the names. Please forgive my ignorance, thank you. Best regards, Rose. ----- Original Message ----- From: Nick Cox <n.j.cox@stata.com> To: statalist@hsphsun2.harvard.edu Subject: Re: AW: st: How to use the marco names? Date: 2009-8-6 22:38:04 In addition to other advice, note that a major issue here is not macros, but the use of -display-. -display- is quite happy to display several things one after another. It is also happy to display literal strings or the contents of the names supplied. The " " or `" "' are essential to disambiguate. Thus for example di "a b c" is an instruction to display the literal string "a b c". -display- neither knows nor cares what that string means. In contrast, di a b c is an instruction to display the contents of a, followed by the contents of b, followed by the contents of c. -display- now needs to work at finding out what a, b and c are. Nick Rose a.k.a. gjhxmu@sina.com wrote: > Dear Martin,Dan and others, > > I am completely confused by the use of local marco. > > Take some examples, > r(files) after -fs- > > r(names) after -est dir- > > r(mean) after -su- > > //maybe the three above are not local marco, but I need to use it in my following procedure. > > r(levels) after -levelsof- > // it seems different when the type of variable following -levelsof- is different. > ........ > > How to display and use them in my follwing procedure? > di `r(levels)' > di `"`r(levels)'"' > di `r(files)' > di `"`r(files)'"' > di `r(names)' > di r(mean) > > Something similar is, > local x="1 2" > local x "1 2" > local x 1 2 > local x: r(mean) > > Concretely, when to add single quote and double quote? when to use colon? > especially,the difference among them. > * * 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/

**References**:**Re: Re: AW: st: How to use the marco names?***From:*gjhxmu@sina.com

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