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From |
Kit Baum <baum@bc.edu> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
st: re: matrix manipulation |

Date |
Thu, 11 Dec 2008 11:00:15 -0500 |

<> Susan said I would like to create a binary matrix (say matrix B) using the existing information from current matrix A. Specifically, for each cell (i,j) of matrix B, I want to replace its value with 1 if the value of the corresponding cell (i,j) of matrix A is less than the specified threshold value. In other words, matrix B[i,j] = 1 if A[i,j] < THRESHOLD. No subscripting required: -------------------------------- mata: mata clear mata: void underbar(string scalar mat, real scalar thresh) { st_matrix("B", (st_matrix(mat) :< thresh)) } end sysuse auto,clear qui reg price trunk weight length turn mat list e(V) mata: underbar("e(V)",0.0001) mat list B -----------------------------------

Kit Baum, Boston College Economics and DIW Berlin http://ideas.repec.org/e/pba1.html An Introduction to Modern Econometrics Using Stata: http://www.stata-press.com/books/imeus.html * * 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/

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