<DIV>hi fournier,</DIV>
<DIV>   this is  my code :</DIV>
<DIV>int main()<BR>{<BR>    int nvar=60;<BR>    independent_variables x(1,nvar);<BR>    x.initialize();<BR>    double f;<BR>    dvector g(1,nvar);<BR>    dmatrix dHessian(1,nvar,1,nvar);<BR>    fmm fmc(nvar); // creates the function minimizing control structure<BR>    fmc.crit=0.000001;<BR>  /////////////////////////////////////////////////////<BR>  gradient_structure gs;<BR>   while(fmc.ireturn>=0)//  <BR>  {//<BR>   fmc.fmin(f,x,g);<BR>   if(fmc.ireturn>0)<BR>   {<BR>           f=func2(x);<BR>     gradcalc(nvar,g);<BR>       }<BR>  }<BR>  //dHessian=fmc.hessian();<BR>  cout << "The minimum value = "  << "at x =\n"<BR>    << x <<"\n"<<"G"<<g<<f<< "\n";<BR>  return 0;<BR>}<BR>I delete dHessian=fmc.hessian(), the program run ok,but when i add dHessian=fmc.hessian(), the following error happened : error LNK2001: unresolved external symbol "public: class dmatrix & __thiscall fmm::hessian(void)" (<A href="mailto:?hessian@fmm@@QAEAAVdmatrix@@XZ">?hessian@fmm@@QAEAAVdmatrix@@XZ</A>).</DIV>
<DIV>    thank you for your help.</DIV>
<DIV>sgwj</DIV>
<DIV><BR> </DIV><PRE><BR>At 2010-10-11 12:28:44,"dave fournier" <davef@otter-rsch.com> wrote:

>This sounds totally destined to fail. I think you should tell us what 
>you want
>to accomplish.
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