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From |
"Nick Cox" <n.j.cox@durham.ac.uk> |

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

Subject |
st: RE: Macro creates scalars-- how can I transfer them into a MATA matrix? |

Date |
Tue, 14 Apr 2009 16:39:55 +0100 |

Much depends on how you use this program (not macro), and you give no precise examples of that. Precise means you say exactly what you type and exactly what Stata did, not give an indirect report. It is written to use other programs L4_co_wx L2_co_wx L2 L4_co_xw L2_co_xw on which there is also no information. But there is no reason to put locals or scalars in variables before reading them into Mata. Mata can access Stata locals and scalars directly. Nick n.j.cox@durham.ac.uk Balsky, Tanya I have a macro (code below) that should spit out 6 scalars. The scalars each contain one numeric value. I would like to create a vector in MATA consisting of each of the 6 values. My thoughts on how to do this was to turn each scalar into a numeric variable then use st_data() in MATA to form the matrix. However, nothing I've tried has successfully converted the scalar to usable numeric variable. I've tried generating a variable equal to the scalar, creating a local scalar equal to the macro scalar and then generating a variable it's equal to, and several other things, but haven't found anything that holds the value, rather than 0 or null. (When I display the scalar value from the macro, it isn't 0 or null.) program define T4_co, rclass syntax anything local w "(`1')" /* w = weight on the gamma=1 term in the X variable */ local alpha "(`2')" /* alpha = probability that gamma=1 */ local rho "(`3')" /* correlation of Y and Z */ local sigmaD "(`4')" /* std dev of D */ local sigmaY "(`5')" /* std dev of Y */ local sigmaZ "(`6')" /* std dev of Z */ L4_co_wx `w' `alpha' `rho' `sigmaD' `sigmaY' `sigmaZ' local L4_co_wx = r(L4_co_wx) L2_co_wx `w' `alpha' `rho' `sigmaD' `sigmaY' `sigmaZ' local L2_co_wx = r(L2_co_wx) L2 1 `alpha' `sigmaD' `sigmaY' local L2_w = r(L2) return scalar L2_co_wx = `L2_co_wx' return scalar L4_co_wx = `L4_co_wx' return scalar T4_co_wx = `L4_co_wx'/`L2_w' L4_co_xw `w' `alpha' `rho' `sigmaD' `sigmaY' `sigmaZ' local L4_co_xw = r(L4_co_xw) L2_co_xw `w' `alpha' `rho' `sigmaD' `sigmaY' `sigmaZ' local L2_co_xw = r(L2_co_xw) L2 `w' `alpha' `sigmaD' `sigmaZ' local L2_x = r(L2) return scalar L2_co_xw = `L2_co_xw' return scalar L4_co_xw = `L4_co_xw' return scalar T4_co_xw = `L4_co_xw'/`L2_x' end * * 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: RE: AW: RE: foreach commands***From:*"Nick Cox" <n.j.cox@durham.ac.uk>

**st: Macro creates scalars-- how can I transfer them into a MATA matrix?***From:*"Balsky, Tanya" <tb2368@mail.gsb.columbia.edu>

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