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From |
Roger Newson <roger.newson@kcl.ac.uk> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: RE: Double -for- loop on one line crashes Stata (resend) |

Date |
Tue, 15 Oct 2002 19:15:46 +0100 |

At 17:31 15/10/02 +0100, Nick Cox wrote (in reply to Kaleb Michaud):

Alternatively, if you have set the command delimiter to a semicolon by usingI don't know if what appears in my mailer is exactly what you typed, but my advice is _never_ to place any text on a line after a left brace { in a loop. Always start a new line. Sometimes Stata can work out what you mean when you do that, but it is not guaranteed that it will be able to do so. This is perhaps tacit rather than explicit in documentation.

#delim ;

then you should be able to type your code as

forvalues i =1/3 {;forvalues j=1/3 {;replace badcode = badcode + "h`i'_`j'" if hrec`i'_`j'chk>0; } ;};

because then a semicolon is a substitute for a carriage return (which is the usual command delimiter). However, even then, the program is more easy to read (for most people) as

forvalues i =1/3 {;

forvalues j=1/3 {;

replace badcode = badcode + "h`i'_`j'" if hrec`i'_`j'chk>0;

} ;

};

Most people in the Stata community, most of the time, do not like multi-command lines (although multi-line commands are fairly common). And a right brace

}

counts as a command. And a phrase ending in a left brace, such as

forvalues i=1\3 {

also counts as a command.

Ideally, Stata is supposed to insist that commands are delimited by a command delimiter, which is either a carriage return or a semicolon, depending on which delimiter is in force. In practice, it sometimes does not do so. However, it is safer to use one delimiter or the other. And it often makes the program more legible to use both, as in the above example.

Roger

--

Roger Newson

Lecturer in Medical Statistics

Department of Public Health Sciences

King's College London

5th Floor, Capital House

42 Weston Street

London SE1 3QD

United Kingdom

Tel: 020 7848 6648 International +44 20 7848 6648

Fax: 020 7848 6620 International +44 20 7848 6620

or 020 7848 6605 International +44 20 7848 6605

Email: roger.newson@kcl.ac.uk

Opinions expressed are those of the author, not the institution.

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**References**:**st: Double -for- loop on one line crashes Stata (resend)***From:*Kaleb Michaud <kaleb@arthritis-research.org>

**st: RE: Double -for- loop on one line crashes Stata (resend)***From:*"Nick Cox" <n.j.cox@durham.ac.uk>

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