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From |
vesile kutlu <kutlu.vesile@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
st: could not calculate numerical derivatives |

Date |
Tue, 20 Nov 2012 11:34:29 +0100 |

Hi all, I am trying to solve the function “v” numerically in Mata but I get the error ” could not calculate numerical derivatives -- discontinuous region with missing values encountered”. I ask Mata to minimize this function with respect to a and b. I provide the initial values of these parameters. Is there something wrong with my code? I would appreciate if you could tell me why I got this error? Is there maybe another way to solve this problem? Thank you. Vesile void mysolver(todo, p, v, S, H) { a=p[1] b=p[2] v=(0.7-exp((a/b)*(exp(b*48)-exp(b*75))))^2+(0.4-exp((a/b)*(exp(b*48)-exp(b*80))))^2 } S=optimize_init() optimize_init_evaluator(S, &mysolver()) optimize_init_evaluatortype(S, "v0") optimize_init_params(S, (1,1)) optimize_init_which(S, "min") p=optimize(S) p end * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**Re: st: could not calculate numerical derivatives***From:*Austin Nichols <austinnichols@gmail.com>

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