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From |
Marwan Elkhoury <elkhoury.marwan@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
st: re matrix substitution |

Date |
Sat, 22 Aug 2009 11:52:14 +0200 |

dear statalist, sorry to bother you with this minor pblm but I'm not familiar with the stata mata environment , more familiar with the matlab matrix environment. anyway, I wish to substitute some matrix factor loadings which are negative or small to zero and keep the others identical. Now, I've written naively some piece of codes to do that and it's not working, either because I'm not writing the pgm correctly or not saving it correctly in the right place or not calling the function correctly; so the codes are for stata 10 version and are the following: /* matrix substitution */ program mysubsi version 10 syntax varname [if] [in] marksample touse mata: mysubsi(string st_matrix("A"), "`touse'") display as txt " C = " as res r(C) end capture mata mata drop mysubsi() mata real matrix mysubsi(real matrix A, real scalar thresh) { real scalar r, c real matrix C r=rows(A) c=cols(A) for(i=1;i<=r;i++) { for(j=1;j<=c;j++) { if (A[i,j]< thresh) { C[i,j] =0 } else { C[i,j] = A[i,j] } } } return(C) } mata mosave mysubsi(), dir(c:\ado\personal\m) replace end /// end of pgm then I try to call the function, writing: mata: mysubsi("A", "`touse'") mata: mysubsi("entering the real matrix function which I want to perform change upon", thresh number) I'm surely missing on something and any help would be greatly appreciated. sincerely yours, Marwan * * 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: re matrix substitution***From:*Scott Merryman <scott.merryman@gmail.com>

**Re: st: re matrix substitution***From:*Tirthankar Chakravarty <tirthankar.chakravarty@gmail.com>

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