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From |
Philipp Rehm <pr9@duke.edu> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
st: Selecting stubnames for -reshape- / macrolists |

Date |
Mon, 30 Jun 2008 14:20:45 +0200 |

. My question is whether there is a clever way to identify the stubnames for a -reshape-. Consider this example: sysuse auto, clear foreach j in 1 2 3 4 5 { gen x_`j'=rep78+`j' gen y_`j'=rep78-`j' } drop y_3 gen id=_n keep id x_* y_* /* This data-set contains the following variables which I want to -reshape-: x_1 x_2 x_3 x_4 x_5 y_1 y_2 y_4 y_5 I want to -reshape- by stubnames x_ and y_. In my "real" data-set, I know that all variables I want to end up with as stubnames contain an underscore (_). They all also do contain numbers after the underscore, but there is no regular pattern there. Now, I am generating a -macrolist- with unique stubnames, but this seems like a detour to me, especially the loop: */ ds *_* foreach v in `r(varlist)' { local f `=regexr("`v'","[0-9]+","")' local n `n' `f' local n: list uniq n } di "*** `n' ****" reshape long `n', i(id) j(foo) Two questions: 1) Is there a better way to identify stubnames for a -reshape-? 2) Is there a more straightforward way to arrive at a unique macrolist than the one I chose? In particular, something like the -regexr()- function, but with the ability to remove all instances (not just the first) of the regular expression. Something like -subinstr()-, but for regular expressions. Thank you! Philipp * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

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