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From |
nicola.baldini2@unibo.it |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: Re: st: creating a matrix by adding rows inside a loop: conformability error |

Date |
Thu, 15 Nov 2007 12:04:11 +0100 |

The problem should be there. I agree that mux*(idd-p) is a row vector, but it is summed to only the i-th (i=1...63) row of the matrixes and not the full matrixes which you noted are [63,15], therefore at each loop I am summing three components which are all [1,15] vectors. Nicola At 02.33 13/11/2007 -0500, you wrote: >Nicola, > >in my opinion, there is a problem with the vector mux*(idd-p) which is (1,15), >not 63... > >valérie > >- --- <nicola.baldini2@unibo.it> wrote: >I would like to create a matrix xtilde such that the i-th row is the sum of three components: >(1) the i-th row of matrix xmean[63,15] multiplied by matrix p[15,15] >(2) the vector mux[1,15] multiplied by the difference between idd[15,15] and p[15,15] >(3) the i-th row of matrix dz[63,30] multiplied by matrix q[30,15] >What's wrong in line 4. of the following syntax? All matrixes appearing in it have 15 columns, and thus there should be not any conformability error. > >. forvalues i = 1/63 { > 2. mat p=inv((r1+vu)/ns[`i'])*r1 > 3. mat q=r2*(idd-p) > 4. matrix xtilde[`i',.] = (nullmat(xtilde) \ xmean[`i',.]*p +mux*(idd-p)+dz[`i',.]*q)) > 5. } >conformability error >r(503); > >Nicola * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

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