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From |
Abe N <aben468@yahoo.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Using regexr() in local macros without using an = sign |

Date |
Thu, 29 Nov 2012 00:35:36 -0800 (PST) |

Thanks for the help Nick, the code you showed me is so much simpler than what I was trying. It seems to work, although I tweaked it a little bit, because I think it's more important that the variable have "b." in there somewhere. Here's the code I ended up using in case anyone else runs into this: foreach v of local varlist { if strmatch("`v'","*b.*") == 1 local onlybases `onlybases' `v' else local nobases `nobases' `v' } I've now run into a slightly different issue that maybe you can help me with. There is somewhere else in my program that I've evaluated a macro and again I run into the character limit. If you were to take the variables contained in onlybases from above, I'm running a loop where first for each variable I run a logistic by itself, then I run a logistic with all the variables in `onlybases' except without the variable. So first for each variable in `onlybases', I perform the following commands (``i'' is the variable here, used after tokenizing and the loop is done using a while command) while "``i''"~="" { logistic `dv' ``i'' if `touse' local elrest = regexr("`rest'", "``i''", "") logistic `dv' `elrest' `onlybases' if `touse' } Is there a way I could accomplish this without evaluating again with an =? Now that I think about it, maybe I should try repeating something like the above within this loop? Maybe: foreach v of local rest { if strmatch("`rest'", ``i'')==0 local elrest `elrest' `v' } I think that would but all the variables except ``i'' in a local, right? Thanks again for the help! Abe Noorbakhsh aben468@yahoo.com --- On Wed, 11/28/12, Nick Cox <njcoxstata@gmail.com> wrote: > From: Nick Cox <njcoxstata@gmail.com> > Subject: Re: st: Using regexr() in local macros without using an = sign > To: statalist@hsphsun2.harvard.edu > Date: Wednesday, November 28, 2012, 1:07 AM > Abe N.: You are asked to use your > _full real name_. > > If I understand your problem, a more basic approach is > something like > > fvexpand `varlist' > local varlist "`r(varlist)'" > foreach v of local varlist { > > if strpos("`v'", 1) == "0" local sheep > `sheep' `v' > > else local goats `goats' `v' > } > > You can use regular expressions if you like, but the key > issue appears > to be whether "0" is the first character. > > -tokenize- is not going to help much, if at all. You want to > look at > each name in a list and whether the names are in individual > macros or > just one long macro is not the main question. > > -regexr()- is a function, not a command. > > Nick > > On Wed, Nov 28, 2012 at 4:55 AM, Abe N <aben468@yahoo.com> > wrote: > > > This is my first time posting something, so I hope this > works and sorry in advance if I messed something up. > I've been trying to write a program that at the basics of it > runs a series of logistic regressions and while I got it to > work for the most part, I've been trying to do something > specifically with factor variables (I'm using version 11.2 > STATA/SE) > > > > What I'm trying to do currently I think is pretty > basic. I'm starting with a variable list that has > factor variables (ex. my current varlist will basically > contain: dependent_variable i.age_cat i.year female), > expanding it, and then trying to create two new macros, one > that contains the base variables (ex. 0b.age_cat 1998b.year) > and another that contains the rest (ex. died 1.age_cat > 2.age_cat 1999.year 2000.year 2001.year female). > > > > The way I went about this at first worked well for a > couple variables, but I was running into the issue of > character limits when you evaluate a macro with an = > sign. Here's the code I was using: > > fvexpand `varlist' > > local varlist = "`r(varlist)'" > > local nobases = "`varlist'" > > local loopvar = > regexm("`nobases'", "[a-zA-Z0-9]+[b][\.][a-zA-Z0-9_]+[ ]*") > > local onlybases > > while "`loopvar'"=="1" { > > local onlybases = > "`onlybases' "+regexs(0) > > local nobases = > regexr("`nobases'", "[a-zA-Z0-9]+[b][\.][a-zA-Z0-9_]+[ ]*", > "") > > local loopvar = > regexm("`nobases'", "[a-zA-Z0-9]+[b][\.][a-zA-Z0-9_]+[ ]*") > > } > > local varlist "`nobases'" > > Then when I run logistics later, I would basically > use: > > logistic `nobases' `onlybases' > > > > The problem with this method is the macro `nobases' > will cut off after a certain # of characters. So I > tried doing things without = signs, but I've been running > into a lot of problems because I'm using the regexr() > command and it doesn't seem to like me using that without an > = sign. > > > > Now that I've written this up, I'm wondering if this > would have been a lot easier using tokenize, but I think I > avoided it because I use it later for a very key aspect of > the program and I think I was worried it might mess with > some of my later loops. Anyway, any help would be much > appreciated. > > > > Thanks, > > > > Abe N. > > aben468@yahoo.com > > * > * For searches and help try: > * http://www.stata.com/help.cgi?search > * http://www.stata.com/support/faqs/resources/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/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**Re: st: Using regexr() in local macros without using an = sign***From:*Abe N <aben468@yahoo.com>

**References**:**Re: st: Using regexr() in local macros without using an = sign***From:*Nick Cox <njcoxstata@gmail.com>

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