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From |
Amadou DIALLO <stata.diallo@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Making a Matrix from Three Variables |

Date |
Sat, 9 May 2009 21:13:21 +0300 |

Hi Allan, This is my 3 cents solution (have not get the time to put it in a formal mata programm, just tested on the command line). I hope it can lead you to what you need to achieve if you play around a bit with it. Best regards. Amadou. clear // suppose you have 3 variables x, y, z, with number of observations of x+y = number of observations of z set obs 10 g x=. replace x=1 in 1 replace x=2 in 2 g y=. replace y =1 in 1 replace y =2 in 2 replace y =3 in 3 replace y =4 in 4 replace y =5 in 5 //g z = round(uniform(),1) g z=. replace z =1 in 1 replace z =2 in 2 replace z =3 in 3 replace z =4 in 4 replace z =5 in 5 replace z =6 in 6 replace z =7 in 7 replace z =8 in 8 replace z =9 in 9 replace z =10 in 10 // tomata x y z, missing // Don't know why not working tomata x in 1/2 tomata y in 1/5 tomata z mata: c = rows(x) d = cols(y') M=J(c,d,.) for(i=1;i<=d;i++) { M[1,i] = z[i] k=d+i M[c,i] = z[k] } M z end 2009/5/9, Glenn Goldsmith <glenn.goldsmith@gmail.com>: > Hi Allan, > > It seems like what you're after is more-or-less the same as converting from > sparse matrix storage, so the mata code here should do the trick: > > http://www.stata.com/statalist/archive/2009-04/msg00142.html > > You just need to get your variables into a mata matrix to start with and you > should be away: > > mata : st_view(x=.,.,("var2","var1","var3")) > > NB: Note the inverted order of var1 and var2. This is because the code for > -sparse()- assumes that the first variable provides the row index, and the > second variable provides the column index. > > HTH, > > Glenn. > > Allan Joseph Medwick <amedwick@gmail.com> wrote: > > Hi, All, > > I have three variables (var1, var2, var3). I would like to create a > matrix where the values of var1 are the columns (ascending), the > values of var2 are the rows (also ascending), and the values of var3 > are the elements in the matrix. I know there must be a user defined > procedure out there to do this, but I haven't been able to find it. > > Thanks, > Allan > > > * > * For searches and help try: > * http://www.stata.com/help.cgi?search > * http://www.stata.com/support/statalist/faq > * http://www.ats.ucla.edu/stat/stata/ > -- --- Amadou B. DIALLO, PHD Development Economist Director, Center for Research and Training on Adult Education Mayotte, FRANCE www.aprosasoma.org +262639693250 * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**Re: st: Making a Matrix from Three Variables***From:*Tirthankar Chakravarty <tirthankar.chakravarty@gmail.com>

**References**:**st: Making a Matrix from Three Variables***From:*"Glenn Goldsmith" <glenn.goldsmith@gmail.com>

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