[Date Prev][Date Next][Thread Prev][Thread Next][Date index][Thread index]

From |
"Abdel Rahmen El Lahga" <rahmen.lahga@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Basic Matrix Definition Question |

Date |
Mon, 15 Oct 2007 21:59:34 +0200 |

For your problem I suggest Mata and optimize as suggested by Kit Baum but I can't say further because I'm a user of Stata 9 and not version 10 with optimize routine. HTH means Hope This Help ( Mark Schaffer uses this expression frequently) AbdelRahmen 2007/10/15, Thomas Jacobs <thomasjacobs@gmail.com>: > Dear Abdel, > > Thanks very much. I totally missed the mkmat command in the manual. > Although I probably made the example too simple, I am trying to write > a program to solve for two equations in two unknowns so I am building > a partial derivative matrix for inverting. I calculate each of the 4 > partials as variables and then combine them into a matrix. I was > stuck on the create matrix step. Using local macros worked as well > with a matrix command. I assume that I would need to first create two > column vectors from 2 of the four variables and then combine these > with another mkmat command. > > Does the HTH after the byvar=x,y line in your mata example have a > specific meaning? > > Sincerely, > > Tom > > On 10/15/07, Abdel Rahmen El Lahga <rahmen.lahga@gmail.com> wrote: > > I dont understand what your are trying to do here a short ansewer is > > gen x=1 > > gen y=2 > > mkmat x y , matrix(byvar) > > matrix list byvar > > In mata the logic is different > > mata: > > x=1 > > y=2 > > byvar=x,y > > HTH > > AbdelRahmen > > > > 2007/10/15, Thomas Jacobs <thomasjacobs@gmail.com>: > > > I am trying to create a matrix from a couple of variables. Let's make > > > this simple. > > > > > > I can hand enter > > > > > > matrix byhand = (1,2) > > > > > > but if I do > > > > > > gen x =1 > > > gen y =2 > > > matrix byvar = (x,y) > > > > > > I get x not found even though display x gives me 1. > > > > > > What am I missing here and is there a workaround? Thanks very much. > > > > > > Sincerely, > > > > > > Tom > > > > > > -- > > > Thomas Jacobs > > > * > > > * 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/ > > > > > > > > > -- > > AbdelRahmen El Lahga > > * > > * 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/ > > > > > -- > Thomas Jacobs > * > * 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/ > -- AbdelRahmen El Lahga * * 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/

**References**:**st: Basic Matrix Definition Question***From:*"Thomas Jacobs" <thomasjacobs@gmail.com>

**Re: st: Basic Matrix Definition Question***From:*"Abdel Rahmen El Lahga" <rahmen.lahga@gmail.com>

**Re: st: Basic Matrix Definition Question***From:*"Thomas Jacobs" <thomasjacobs@gmail.com>

- Prev by Date:
**Re: st: -adjust- with interaction terms?** - Next by Date:
**RE: st: -adjust- with interaction terms?** - Previous by thread:
**Re: st: Basic Matrix Definition Question** - Index(es):

© Copyright 1996–2015 StataCorp LP | Terms of use | Privacy | Contact us | What's new | Site index |