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From |
Tirthankar Chakravarty <[email protected]> |

To |
[email protected] |

Subject |
Re: st: Basic matrix functions |

Date |
Wed, 27 Jan 2010 19:44:53 +0530 |

<> There are probably many ways to do this, but here is one: ***************************** clear* set matsize 1000 mat define example = matuniform(1000,14) // extract the 77th row (say) mat define example2 = example[77, 1...] mat list example2 // append in a loop forv i=1/100 { mat define example3 = (nullmat(example3) \ matuniform(1,14)) } mat list example3 // calculate the standard deviation of each column (using Mata) mata: st_matrix("example4", diagonal(sqrt(variance(st_matrix("example3"))))) mat list example4 ***************************** On Wed, Jan 27, 2010 at 7:21 PM, XU Moqi <[email protected]> wrote: > Dear list, > > I'm struggling to use the matrix functions: > > 1) I have a nx14 matrix called A and would like to extract a new matrix > that consists of line i of Matrix A. > > 2) I'm running a loop, and in each stage, I create a new 1x14 matrix. I > would like to append this line to a matrix B. > > 3) Then I would like to calculate the standard deviation of each column > of matrix B. > > Thank you very much for your help! > > Moqi > > > > * > * 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/

**References**:**st: RE: merge one to many***From:*"Amy Dunbar" <[email protected]>

**st: Basic matrix functions***From:*"XU Moqi" <[email protected]>

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