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From |
jpitblado@stata.com (Jeff Pitblado, StataCorp LP) |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: using "/" symbol in matrix row names, Stata 10 |

Date |
Mon, 04 Feb 2008 18:10:03 -0600 |

Zurab Sajaia <zsajaia@hotmail.com> asks about using "/" in matrix stripes: > This question might refer to the StataCorp folks but I still decided to post > it here. And apologies for asking it again but the last time it was part of > another discussion and I guess escaped most of the people's attention. > > In the previous versions it was legitimate to write: > > . mat a=4 > . mat rownames a = /name > > and the result was as expected (by me): > > . mat list a > symmetric a[1,1] > c1 > /name 4 > > . mat rownames a = eqn:/name > > . mat list a > symmetric a[1,1] > c1 > eqn:/name 4 > > Now if I try to do the same thing in Stata 10: > > . mat a=4 > . mat rownames a = /name > . mat list a > symmetric a[1,1] > c1 > name:_cons 4 > > and in the second case: > > . mat rownames a = eqn:/name > /name invalid name > > Since I'm using "/" symbol in the matrix row names in one of my programs I'd > really like to know if it's a bug in Stata 10 that might be fixed some time > soon or the change in behavior was intentional (I couldn't find any changes > in the help file) and I need to modify my program in order for it to keep > working. This change was intentional. As Zurab has shown above, -matrix rownames- and -matrix colnames- in Stata 10 interpret "/name" to mean "name:_cons" so "eq:/name" is now an invalid syntax. This change was made to make matrix stripe logic consistent with how -_b- and -_se- are interpreted. Here is an example of what I mean. . sysuse auto (output omitted) . intreg mpg mpg (output omitted) . di _b[/lnsigma] 1.3469236 The above works in Stata 10 and earlier. Now, in Stata 10 you can also do . matrix b = 55, 1.5 . matrix colname b = /xb /lnsigma . matrix list b b[1,2] xb: lnsigma: _cons _cons r1 55 1.5 -ml- has advertised this short-cut notation since Stata 6, so we didn't foresee that this would cause anyone trouble. We regret the trouble we have caused Zurab. --Jeff jpitblado@stata.com * * 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/

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