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From |
James Sams <sams.james@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Use extended functions outside of macro assignment? |

Date |
Wed, 7 Sep 2011 02:45:14 -0500 |

On Wednesday, September 07, 2011, you wrote: > The logic of -list- with -if- is like any other command. Consider > > list if 2 == 2 > > 2 == 2 is (vacuously) true when considered for observation 1, for > observation 2, and so on, so every variable and every observation will > be -list-ed. The same will be true of your syntax. If your condition > is true, i.e. there is a match, then everything will be listed. No, you are misunderstanding. Take the latter example, id is a variable, ids is a local macro list. The conditional would be re-evaluated for each observation's value of the 'id' variable. Same for the regexm example. (repasted for reference). > > Something like this: > > list if regexm("`: label (varname)'", "my_regex") > > list if `: list posof id in ids' Doing this in a two step process often gets tedious due to the size of the data-set and memory limitations. Being able to operate on value labels directly as though they were the value of the variable would be particularly helpful. Also, list was an example. I am rarely interested in actually listing data. I've got a class of problems that I am trying to solve and being able to dynamically invoke extended functions in the manner described would be helpful. If it is not possible, so be it. But I wanted to make sure my question was clear first. I thought I had seen someone doing something very close to this at some point but cannot find it again. * * 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: Use extended functions outside of macro assignment?***From:*Nick Cox <njcoxstata@gmail.com>

**References**:**st: Use extended functions outside of macro assignment?***From:*James Sams <sams.james@gmail.com>

**Re: st: Use extended functions outside of macro assignment?***From:*Nick Cox <njcoxstata@gmail.com>

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