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From |
dai_yunhao <[email protected]> |

To |
[email protected] |

Subject |
st: a question about equation solution |

Date |
Tue, 30 Aug 2011 09:10:42 -0700 (PDT) |

Hi, everybody, I don't know whether the mata program could solve the equation, and I run a program like this: clear all set obs 10 g a=1 g b=2 g c=_n g x=. order x a b c mata v=J(1,1,.) st_view(v,., "x a b c") function y(x,a,b,c) { return (-c+a+b+x) } for (i=1;i<=rows(v);i++) { r=mm_root(x=.,&y(),0,1,1e-9,1000,v[i,2],v[i,3],v[i,4]) v[i,1]=x } end l,noo gen d=c-a-b and the result is: +---------------------+ | x a b c d | |---------------------| 1. | 0 1 2 1 -2 | 2. | 0 1 2 2 -1 | 3. | 0 1 2 3 0 | 4. | 1 1 2 4 1 | 5. | 1 1 2 5 2 | |---------------------| 6. | 1 1 2 6 3 | 7. | 1 1 2 7 4 | 8. | 1 1 2 8 5 | 9. | 1 1 2 9 6 | 10. | 1 1 2 10 7 | +---------------------+ Shouldn't the x be the solution of the equation x+a+b=c ,and the value of x equal to the value of d ? -- View this message in context: http://statalist.1588530.n2.nabble.com/a-question-about-equation-solution-tp6742764p6742764.html Sent from the Statalist mailing list archive at Nabble.com. * * 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**:**Re: st: a question about equation solution***From:*Matthew Baker <[email protected]>

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