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From |
"Thomas Jacobs" <thomasjacobs@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Basic Matrix Definition Question |

Date |
Mon, 15 Oct 2007 14:03:51 -0500 |

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/

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

**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>

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