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From |
Tirthankar Chakravarty <tirthankar.chakravarty@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st:weave two matrices row by row |

Date |
Sun, 26 Dec 2010 18:43:38 -0800 |

Matrix multiplication is probably the most memory-efficient and generalisable way of doing this: ************************************* clear* mata mA = runiform(10, 8) mB = runiform(10, 8) mD = (designmatrix(range(1, 19, 2))'\J(1, 10, 0))*mA + designmatrix(range(2, 20, 2))'*mB mD end ************************************* T On Sun, Dec 26, 2010 at 4:34 PM, Amanda Fu <mandy.fu1@gmail.com> wrote: > > Hi All, > > I was wondered if there is any way to weave two matrix row by row. > Say, I have matrix A [10,8] and B[10,8]. I want to create a new matrix > C looks like as: > > matrix C [20,8]: > --------------------------------- > row 1 : row 1 of A > row 2: row 1 of B > row 3: row 2 of A > row 4: row 2 of B > .......... > row 19: row 10 of A > row 20: row 10 of B > --------------------------------- > Right now I think I could do the following: > > (1) matrix define C as a 20*8 matrix. > (2) use -mkmat- to change A and B into 8 variables respectively > A1,A2,..A8,B1,..,B8. > (3) Then define each row using the variables from (2). > > But when actually conducting the above way,I find it requires to be > very careful and much more work than I expected. This is why I think > it would be better that I ask the expert here to see how an expert > will deal with this. > > Thanks for your time! > > Sincerely, > Amanda > * > * 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/ -- To every ω-consistent recursive class κ of formulae there correspond recursive class signs r, such that neither v Gen r nor Neg(v Gen r) belongs to Flg(κ) (where v is the free variable of r). * * 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:weave two matrices row by row***From:*Amanda Fu <mandy.fu1@gmail.com>

**References**:**st:weave two matrices row by row***From:*Amanda Fu <mandy.fu1@gmail.com>

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