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From |
László Sándor <sandorl@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: RE: mata: columns of different eltypes in a transmorphic matrix |

Date |
Thu, 10 Oct 2013 14:04:23 -0400 |

Excellent answers, thanks a lot. If only I could code as fast as Joseph can. To be clear: I made an elementary mistake, I completely overlooked I need to use st_sdata and st_sview. Thanks again! On Thu, Oct 10, 2013 at 8:42 AM, Nick Cox <njcoxstata@gmail.com> wrote: > Naturally, you do often need to combine numeric and string, and the > answer is that strings can include numeric characters, but not vice > versa. So, we can do things like this: > > sysuse auto > > In Mata: > > : make = st_sdata(., "make", "foreign") > > : make > 1 > +------------------+ > 1 | Audi 5000 | > 2 | Audi Fox | > 3 | BMW 320i | > 4 | Datsun 200 | > 5 | Datsun 210 | > 6 | Datsun 510 | > 7 | Datsun 810 | > 8 | Fiat Strada | > 9 | Honda Accord | > 10 | Honda Civic | > 11 | Mazda GLC | > 12 | Peugeot 604 | > 13 | Renault Le Car | > 14 | Subaru | > 15 | Toyota Celica | > 16 | Toyota Corolla | > 17 | Toyota Corona | > 18 | VW Dasher | > 19 | VW Diesel | > 20 | VW Rabbit | > 21 | VW Scirocco | > 22 | Volvo 260 | > +------------------+ > > : price = st_data(., "price", "foreign") > > : make, strofreal(price, "%2.0f") > 1 2 > +-----------------------------------+ > 1 | Audi 5000 9690 | > 2 | Audi Fox 6295 | > 3 | BMW 320i 9735 | > 4 | Datsun 200 6229 | > 5 | Datsun 210 4589 | > 6 | Datsun 510 5079 | > 7 | Datsun 810 8129 | > 8 | Fiat Strada 4296 | > 9 | Honda Accord 5799 | > 10 | Honda Civic 4499 | > 11 | Mazda GLC 3995 | > 12 | Peugeot 604 12990 | > 13 | Renault Le Car 3895 | > 14 | Subaru 3798 | > 15 | Toyota Celica 5899 | > 16 | Toyota Corolla 3748 | > 17 | Toyota Corona 5719 | > 18 | VW Dasher 7140 | > 19 | VW Diesel 5397 | > 20 | VW Rabbit 4697 | > 21 | VW Scirocco 6850 | > 22 | Volvo 260 11995 | > +-----------------------------------+ > Nick > njcoxstata@gmail.com > > > On 10 October 2013 13:27, Joseph Coveney <stajc2@gmail.com> wrote: >> Nick Cox wrote: >> >> This is an excellent answer, but one simple point seems submerged. An >> elementary strategy is to put numeric variables in a numeric matrix >> and string variables in a string matrix. I've often done that in Mata >> programs, and never yet felt the need for structs, pointers, and so >> forth. >> >> -------------------------------------------------------------------------------- >> >> I agree. I'm not sure what László's needs are for keeping Stata dataset string >> and numeric data in sync in a single location in Mata. Perhaps, if he'd like to >> elaborate, someone on the list could offer suggestions that don't entail structs >> or pointer vectors, List or Array classes, and the like. >> >> As you could see from my example, taking the long way round involves additional >> programming steps that in turn give rise to opportunities for logical errors, >> such as -select(X, missing(X[1,]))- instead of -select(X, !missing(X[1,]))-, and >> syntax errors, such as -PointerVector = (A, B)- instead of -PointerVector = &A, >> &B-, among others that I haven't noticed yet. >> >> Joseph Coveney >> >> >> * >> * 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/ * * 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/

**References**:**st: mata: columns of different eltypes in a transmorphic matrix***From:*László Sándor <sandorl@gmail.com>

**st: RE: mata: columns of different eltypes in a transmorphic matrix***From:*Joe Canner <jcanner1@jhmi.edu>

**Re: st: RE: mata: columns of different eltypes in a transmorphic matrix***From:*László Sándor <sandorl@gmail.com>

**Re: st: RE: mata: columns of different eltypes in a transmorphic matrix***From:*Joseph Coveney <stajc2@gmail.com>

**Re: st: RE: mata: columns of different eltypes in a transmorphic matrix***From:*Nick Cox <njcoxstata@gmail.com>

**Re: st: RE: mata: columns of different eltypes in a transmorphic matrix***From:*"Joseph Coveney" <stajc2@gmail.com>

**Re: st: RE: mata: columns of different eltypes in a transmorphic matrix***From:*Nick Cox <njcoxstata@gmail.com>

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