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From |
<Jean-Francois.Bertrand@fin.gc.ca> |

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

Subject |
RE: st: Need help on using external global in st_view to avoid recompiling in Mata |

Date |
Fri, 30 Mar 2012 13:25:03 -0400 |

Hello Nick, Many thanks for taking the time to look at my problem. I have to admit, however, that I am not sure to fully understand what you suggest (sorry). I am slowly changing the way I do things to address problem in Mata, but it's not always easy as old (and sometime bad) programming habits are deeply rooted in me ;o) For example, I use to write: st_view(h_0=.,.,("h0")) st_view(h_20=.,.,("h20")) st_view(h_40=.,.,("h40")) st_view(y_0=.,.,("y0")) st_view(y_20=.,.,("y20")) st_view(y_40=.,.,("y40")) U_0 = beta_y:*y_0 :+ beta_h:*h_0 U_20 = beta_y:*y_20 :+ beta_h:*h_20 U_40 = beta_y:*y_40 :+ beta_h:*h_40 sum_eU = exp(U_0) :+ exp(U_20) :+ exp(U_40) but working with matrices such as st_view(y_i=.,.,("y0","y20","y40")) st_view(h_i=.,.,("h0","h20","h40")) reduces the number of arguments and intermediate step and allow me to work in a more generic way. It makes it easier to change the number of labour supply choice and it also gives me the same results (hopefully not because of luck). So far, I have compiled a few versions of my function (with different names) where the only things that vary is the number (and name) of variables that are used in st_view (e.g. different choices of hours). Of course, I use different function on different data set that have been constructed appropriately. If I understand correctly, this is the way to do it. Many thanks, Jean-François Bertrand -----Original Message----- From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Nick Cox Sent: March 30, 2012 11:56 AM To: statalist@hsphsun2.harvard.edu Subject: Re: st: Need help on using external global in st_view to avoid recompiling in Mata I would not think this way. Write your code to take what varies as an input argument. Nick On Fri, Mar 30, 2012 at 4:32 PM, <Jean-Francois.Bertrand@fin.gc.ca> wrote: > I have written a Mata function to use with -moptimize- or -ml- to > estimate a discrete labour supply model. The simplified example below > works for data where I would have 3 distinct hours choice (e.g. 0 > hours, 20 hours and 40 hours) with income for each choice. > > ---- > > version 11.2 > > mata: > > function LSmodel_d0(transmorphic scalar M, real scalar todo, real > rowvector b, real scalar lnf, real rowvector g, real matrix H) { > real colvector beta_y, beta_h > > real colvector U > real colvector sum_eU > real colvector y_chosen > real colvector h_chosen > > real colvector L_1 > > real matrix y_i > real matrix h_i > > beta_y = moptimize_util_xb(M,b,1) > beta_h = moptimize_util_xb(M,b,2) > > st_view(y=.,.,"y_chosen") > st_view(h=.,.,"h_chosen") > > st_view(y_i=.,.,("y0","y20","y40")) > st_view(h_i=.,.,("h0","h20","h40")) > > U = beta_y:*y_chosen :+ beta_h:*h_chosen > > U_i = beta_y:*y_i :+ beta_h:*h_i > > sum_eU = quadrowsum(exp(U_i)) > > L_1 = (U :- ln(sum_eU)) > > lnf = moptimize_util_sum(M,L_1) } > > mata mosave mata_LS_singles_quad_d2(), dir(PERSONAL) replace > > end > > ---- > > Since I might use different hours choices for different group of the > population (as done in the economic literature), I would like to avoid > having to recompile the code if I want to run my estimator on, for > example, 5 distinct hours choice (e.g. 0 hours, 10 hours, 20 hours, 30 hours and 40 hours) so that: > > st_view(y_i=.,.,("y0","y10","y20","y30","y40")) > st_view(h_i=.,.,("h0","h10","h20","h30","h40")) > > I was thinking of defining a global macro that could vary depending on the data I use. > For example, I could use: > > global h_i = `""h0","h20","h40""' > > or > > global h_i = `""h0","h10","h20","h30","h40""' > > depending on the data used. > > Is it possible? > > My attempts to use pointers and global macro (-findexternal()- or > -valofexternal()-) have not worked so far. * * 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/ * * 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: Need help on using external global in st_view to avoid recompiling in Mata***From:*<Jean-Francois.Bertrand@fin.gc.ca>

**Re: st: Need help on using external global in st_view to avoid recompiling in Mata***From:*Nick Cox <njcoxstata@gmail.com>

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