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| From | behailu ayele <bbezabih@googlemail.com> |
| To | statalist@hsphsun2.harvard.edu |
| Subject | Re: st: RE: submatrix, Thanks Nick! |
| Date | Tue, 15 Nov 2011 12:59:07 +0000 |
Nick, Many thanks. It worked. I have brilliant looking submatrices now! behailu On 11/15/11, Nick Cox <n.j.cox@durham.ac.uk> wrote: > Use Mata: e.g. > > : y = (1::81) > > : y2 = rowshape(y,9) > > : y2 > 1 2 3 4 5 6 7 8 9 > +----------------------------------------------+ > 1 | 1 2 3 4 5 6 7 8 9 | > 2 | 10 11 12 13 14 15 16 17 18 | > 3 | 19 20 21 22 23 24 25 26 27 | > 4 | 28 29 30 31 32 33 34 35 36 | > 5 | 37 38 39 40 41 42 43 44 45 | > 6 | 46 47 48 49 50 51 52 53 54 | > 7 | 55 56 57 58 59 60 61 62 63 | > 8 | 64 65 66 67 68 69 70 71 72 | > 9 | 73 74 75 76 77 78 79 80 81 | > +----------------------------------------------+ > > Nick > n.j.cox@durham.ac.uk > > behailu ayele > > Is there anyway, then, I can actually restructure my initial matrix in > a way that it has the dimensions I want (9 by 9) instead of one single > row? > > On 11/15/11, Nick Cox <n.j.cox@durham.ac.uk> wrote: >> Yes; Stata can only regard it as an error if you refer to rows and/or >> columns that don't exist. > > behailu ayele > >> Thanks very much. I now went to matrix extraction and I think know my >> problem, now. My estimation result reads only as row. Whatever I want >> to extract,, it works when I specify as one row and any number of >> columns. What I mean is, it works when I do either of these: >> >> matrix A = b[1, "b1".."b9"] >> >> matrix A = b[1, "a1".."a9"] >> >> >> but it says conformability error whenever I do >> >> matrix A = b[1..2, "a1".."a9"] >> >> >> I am thinking I need to restructure my estimation result such that it >> is a proper matrix to begin with (with 9 by 9 dimension) and not just >> a matrix with one row and several columns. >> >> Thankyou again. >> >> behailu >> >> >> On 11/15/11, Nick Cox <n.j.cox@durham.ac.uk> wrote: >>> This is covered by the help on -matrix extraction- >>> >>> matrix new = b[1..9, 7..9] >>> >>> The = operator for assignment should be used (not ==). >>> >>> Nick >>> n.j.cox@durham.ac.uk >>> >>> behailu ayele >>> >>> I have problem extracting parts of a matrix I estimated. >>> >>> my matrix e(b) is 9 by 9. Now I want to extract the first line and I did >>> this. >>> >>> matrix b=e(b) >>> and then >>> matrix new==b[1,1..9] >>> >>> my problem is when i want to have a 3 by 9 matrix of the last three >>> columns >>> >>> is this not what I am supposed to do? >>> >>> matrix new==b[7/9,1..9] >> > > * > * 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/ > * * 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/