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

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

Subject |
RE: st: Should be simple yet ... how to write a function? |

Date |
Wed, 18 Feb 2009 12:08:56 -0000 |

It's entirely separate of the main point, but Maarten's example contains a bug. The body of the program should be c_local `1' = (`2')^2 For further explanation, see FAQ . . . . . . . . . . . . . . The use of macros with the power operator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . W. Gould 12/99 I coded `a'^2 and got the wrong sign. Why? <http://www.stata.com/support/faqs/lang/macpow.html> Nick n.j.cox@durham.ac.uk Maarten buis --- On Wed, 18/2/09, Fabrice <fcaspam@yahoo.fr> wrote: > how does one write a *function*, i.e. a program that returns > a value, and that can be called like local y = fct(x), where > x and y are numbers or strings. <snip> > FYI, I know about r-type vs. e-type program, and know how to > store results to return to main program. Short answer: you can't. Longer answer: You can leave a local behind using the not documented -c_local- command, so in the example below the program square leaves behind a local called foo *------------ begin example --------- capture program drop square program define square c_local `1' = `2'^2 end square foo 2 di `foo' *------------ end example ----------- You can make a function like program that works with the -egen- command, but this will only make variables. To do so call your program _g<whatever>.ado, to create the whatever "function". You can look at -viewsource _gcount.ado- to see an example of such a program. Alternatively you can make a function in Mata, but that will only function as a function within Mata. * * 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**:**st: Should be simple yet ... how to write a function?***From:*"Fabrice" <fcaspam@yahoo.fr>

**Re: st: Should be simple yet ... how to write a function?***From:*Maarten buis <maartenbuis@yahoo.co.uk>

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