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From |
Nick Cox <n.j.cox@durham.ac.uk> |

To |
"'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu> |

Subject |
RE: st: RE: submatrix |

Date |
Tue, 15 Nov 2011 12:14:32 +0000 |

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/

**References**:**st: submatrix***From:*behailu ayele <bbezabih@googlemail.com>

**st: RE: submatrix***From:*Nick Cox <n.j.cox@durham.ac.uk>

**Re: st: RE: submatrix***From:*behailu ayele <bbezabih@googlemail.com>

**RE: st: RE: submatrix***From:*Nick Cox <n.j.cox@durham.ac.uk>

**Re: st: RE: submatrix***From:*behailu ayele <bbezabih@googlemail.com>

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