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From |
Thomas Jacobs <thomasjacobs@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Re: controlling output in the results window |

Date |
Thu, 26 Feb 2009 17:54:41 -0600 |

Well call me pig-headed but I just could not let go of this until I figured out how to get it working. In the end it required either converting mata values(matrices) to stata locals(matrices) so they could be passed to the mata function. I post it here not just for posterity but for anyone else trying to pass a stata matrix to a mata function within an ado file. Hopefully it will save someone the many hours I spent trying to get it to work. Both eofb and sFirmModelResults are stata matrices. The latter was created from a mata matrix FirmModelResults using st_replacematrix("sFirmModelResults",FirmModelResults) and the ado follows: program ProduceResults version 10.1 local EventBeginDay "`1'" local EventEndDay "`2'" local scolFirm "`3'" mata: OutputFn("eofb","sFirmModelResults") end version 10.1 mata: void OutputFn(eofb,sFirmModelResults) { printf("Results for Event Period beginning with trading day %4.0f and ending at day %4.0f.\n", strtoreal(st_local("EventBeginDay")), strtoreal(st_local("EventEndDay"))) colFirm = strtoreal(st_local("scolFirm")) FirmModelVar = st_matrixcolstripe("e(b)")[.,2] printf("Average Firm Adjusted R Square %12.4f\n", st_matrix(sFirmModelResults)[1,strtoreal(st_local("scolFirm"))]) printf("\n") printf("{txt}Average Firm Model{c |} Coef SampSE t-stat p-val\n") printf("{hline 18}{c +}{hline 52}\n") for (mi=1; mi<= colFirm-1; mi++) { printf("{txt} %13s {c |}", FirmModelVar[mi]) for (mj=1; mj <=4; mj++) { printf("{res} %9.4f",st_matrix(sFirmModelResults)[mj,mi]) } printf("\n") } } end On Sat, Feb 21, 2009 at 7:20 AM, Kit Baum <baum@bc.edu> wrote: > <> > First of all do not compile your function into a .mo. (I know, my slides > show how to do that, but it confuses the issue here). Put all of the Mata > code in the do-file that you're running. You need not make an ado-file out > of it. > > The error at the execution of your Mata function presumably results from > "ColFirm" being something other than a numeric scalar. That is what you have > told Mata to expect. In hprescott.ado I pass a number, stored in local macro > smooth, to the Mata routine. Note how it is `smooth', not "`smooth'". > > Your function is looking for a matrix FirmModelResults, but you are > declaring it as a string scalar. If you generate a matrix in Stata and want > to use it in Mata, the easiest way is via st_matrix(). Likewise FirmModelVar > is a matrix, so should be transferred as such. The reason why hprescott uses > string scalars is that it has to exchange lists of variable names with > Stata. The logic would be quite different if it was exchanging matrices with > Stata. > > 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 > > > On Feb 21, 2009, at 02:33 , Tom wrote: > >> I am back again, having studied your slides. I have some conceptual >> questions. I was unable to convert my called do file to an ado nor >> understand several of the posts people submitted in response to my >> inquiries on the conversion. So, having read your slides I took the >> section of my called do file that I was unable to silence with the >> quietly command and attempted to make it a mata function, but I have >> been unable to get that to work, either. One thing I have noticed is >> that the Stata manuals in M-1 ado - using Mata with ado files and your >> slides always seem to imply that a mata function is called from a >> stata program passing stata variables. In my case, I have a stata >> program with significant sections of mata code and mata variables >> created prior to the called mata function, so I am left wondering how >> does one pass mata variables to a mata function? If this is not >> permitted, does this mean I need to broaden my mata function to >> include all the mata code in the stata program and pass stata >> variables as in the examples? >> >> Here is the code section I am trying to convert to a mata function >> right below the end of the quietly command where colFirm, >> FirmModelResults, and FirmModelVar are mata variables created earlier: >> >> *end quietly >> } >> >> mata: >> >> //Used one pass loop to clean up output >> for (mh=1; mh<=1;mh++) { >> >> printf("Results for Event Period beginning with trading day %4.0f >> and >> ending at day %4.0f\n", >> strtoreal(st_local("EventBeginDay")), >> strtoreal(st_local("EventEndDay"))) >> printf("Average Firm Adjusted R Square >> %12.4f\n",FirmModelResults[1,colFirm]) >> printf("\n") >> printf("{txt}Average Firm Model{c |} Coef SampSE >> t-stat p-val\n") >> printf("{hline 18}{c +}{hline 52}\n") >> >> for (mi=1; mi<= colFirm-1; mi++) { >> >> printf("{txt} %13s {c |}", FirmModelVar[mi]) >> >> for (mj=1; mj <=4; mj++) { >> >> printf("{res} %9.4f",FirmModelResults[mj,mi]) >> >> } >> >> printf("\n") >> >> } >> >> } >> >> end >> >> Here is the do file I use to create the function (as a side question, >> every time I run this the replace option fails giving me an error that >> the .mo already exists and I have to manually delete it and restart >> stata. I have posted this to tech support to see if this is a bug but >> thought I would mention in case you see something I am doing wrong): >> >> *PooledResultsMo.do >> version 10.1 >> mata: >> void PooledResultsMo(real scalar colFirm, string scalar >> FirmModelResults, string scalar FirmModelVar) >> { >> printf("Results for Event Period beginning with trading day %4.0f >> and >> ending at day %4.0f\n", >> strtoreal(st_local("EventBeginDay")), >> strtoreal(st_local("EventEndDay"))) >> printf("Average Firm Adjusted R Square >> %12.4f\n",FirmModelResults[1,colFirm]) >> printf("\n") >> printf("{txt}Average Firm Model{c |} Coef SampSE >> t-stat p-val\n") >> printf("{hline 18}{c +}{hline 52}\n") >> >> for (mi=1; mi<= colFirm-1; mi++) { >> >> printf("{txt} %13s {c |}", FirmModelVar[mi]) >> >> for (mj=1; mj <=4; mj++) { >> >> printf("{res} %9.4f",FirmModelResults[mj,mi]) >> >> } >> >> printf("\n") >> >> } >> } >> >> mata mosave PooledResultsMo(), dir(PERSONAL) replace >> end >> >> And here is the error I get when I try to execute the entire program >> where a do file calls a do file which calls PooledResultsMo: >> >> >> . *end quietly >> . } >> . mata:PooledResultsMo("`colFirm'", "`FirmModel'", "`FirmModelVar'" ) >> PooledResultsMo(): 3253 <tmp>[1,1] found where real required >> <istmt>: - function returned error >> r(3253); > > * > * 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/ > -- Thomas Jacobs * * 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**:**st: 'cnreg' command to fit Censored-normal regression model***From:*Tracy Bai <tracy.bai@flinders.edu.au>

**References**:**st: Re: controlling output in the results window***From:*Kit Baum <baum@bc.edu>

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