Notice: On April 23, 2014, Statalist moved from an email list to a forum, based at statalist.org.

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

From |
Joe Canner <jcanner1@jhmi.edu> |

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

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

Date |
Thu, 10 Oct 2013 01:50:47 +0000 |

Laszlo, As I understand it, transmorphic means that a matrix can take on one of a number of types (real, complex, string, or pointer), not that it can be comprised of multiple types. This is useful for making functions that can handle different types of arguments, but is probably not helpful for what you want to do. See here for an interesting discussion of the origins of transmorphic matrices in Mata: http://www.stata.com/statalist/archive/2006-10/msg00739.html (I am assuming, absent evidence to the contrary, that Bill has not changed his mind about transmorphic matrices since 2006.) As for the documentation, while it does specifically prohibit or discourage what you are trying to do, it certainly does not give any reason to think that it is possible. Regards, Joe ________________________________________ From: owner-statalist@hsphsun2.harvard.edu [owner-statalist@hsphsun2.harvard.edu] on behalf of László Sándor [sandorl@gmail.com] Sent: Wednesday, October 09, 2013 8:56 PM To: statalist@hsphsun2.harvard.edu Subject: st: mata: columns of different eltypes in a transmorphic matrix Hi all, I am confused by some behavior in StataMP 13 on my mac. I am pretty sure that a transmorphic matrix can have columns (or simply cells) of different types, as you can easily grab some Stata data with st_data and the resulting matrix will hold both strings and reals according to your Stata variables. But then I am not sure I understand why Stata complains about joining transmorphic matrices into a transmorphic matrix if some of them happen to hold reals and other strings. Why isn't this OK if I mean the end result to hold cells of both types? I tried to define a transmorphic placeholder first and fill in the columns one by one, but if I start with (transmorphic colvectors happening to be:) real colvectors the code breaks when I get to the string colvector. I don't see why this is invalid or why this limitation isn't better documented. In any case, it would be nice to have a way around this. Thanks! * * 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: RE: mata: columns of different eltypes in a transmorphic matrix***From:*László Sándor <sandorl@gmail.com>

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

- Prev by Date:
**st: mata: columns of different eltypes in a transmorphic matrix** - Next by Date:
**Re: st: RE: mata: columns of different eltypes in a transmorphic matrix** - Previous by thread:
**st: mata: columns of different eltypes in a transmorphic matrix** - Next by thread:
**Re: st: RE: mata: columns of different eltypes in a transmorphic matrix** - Index(es):