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From |
Sergiy Radyakin <serjradyakin@gmail.com> |

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

Subject |
Re: st: MATA function modifies global variables |

Date |
Thu, 6 Jun 2013 16:17:57 -0400 |

Can you tell us what neig is? what blop_vec is? On Thu, Jun 6, 2013 at 4:10 PM, George Vega Yon <g.vegayon@gmail.com> wrote: > Dear Statalisters, > > I'm having a weird problem on variables' scope. I have a function that > takes two objects (a real colvector and a matrix) wich, once inside > the function, are transposed. This function returns a matrix (builded > inside of the function of course). The problem is that the function > seems to actually transpose the global objects (not only the copies > within the function), thing that, as far as I know, should not be > happening as I'm not using pointers to the global objects. > > My code looks something like this > __________________________ > mata: > /* Function definition */ > real colvector myfun(real colvector y, real matrix x) { > > real matrix z > > y = y' > x = x' > > ... some code lines (no poiter to Y or X)... > > return(z) > } > > Y = runiform(rows(neig),1) > X = ( > 0,0 \ > 1,0 \ > 1,1 \ > 0,1 \ > 1/2,1/2\ > .9,1/2 \ > .2,.5 \ > .8,.3 > ) > > > /* Testing */ > timer_clear() > for(i=1;i<=100;i++) { > timer_on(1) > YC = blop_vec(Y,X) > timer_off(1) > } > timer() > > end > __________________________ > > > I get the error > > __________________________ > myfun: 3203 Y[1,8] found where colvector required > <istmt>: - function returned error > __________________________ > > Thanks in advanced, > > George Vega Yon > 7 647 2552 > http://cl.linkedin.com/in/georgevegayon > * > * For searches and help try: > * http://www.stata.com/help.cgi?search > * http://www.stata.com/support/faqs/resources/statalist-faq/ > * http://www.ats.ucla.edu/stat/stata/ * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**Re: st: MATA function modifies global variables***From:*George Vega Yon <g.vegayon@gmail.com>

**References**:**st: MATA function modifies global variables***From:*George Vega Yon <g.vegayon@gmail.com>

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