[petsc-users] 回复： How to get the eigenvectors in Slepc

[ztdep at yahoo.com.cn]

Dear Roman:
   Could you please tell me how to ask questions in mailing list. i have put one question to petsc-users at mcs.anl.gov, but i get nothing feedback
 
 



>________________________________
> 发件人： Jose E. Roman <jroman at dsic.upv.es>
>收件人： PETSc users list <petsc-users at mcs.anl.gov> 
>发送日期： 2013年4月14日, 星期日, 10:44 下午
>主题: Re: [petsc-users] How to get the eigenvectors in Slepc
> 
>
>
>El 14/04/2013, a las 08:04, Sonya Blade escribió:
>
>> Dear All,
>> 
>> If I have all eigenvalues as real numbers is it possible mathematically that 
>> I get the complex eigenvectors? Because nowhere in my solution I obtain the 
>> complex eigenvalues but Slepc returns the complex for eigenvectors.
>> 
>> Your enlightenment will be appreciated.
>> 
>> Regards,                           
>
>If the eigenvector is complex then of course the eigenvalue is complex as well (I assume your matrix is real non-symmetric). You have to get both the real and imaginary parts of the eigenvalue.
>http://www.grycap.upv.es/slepc/documentation/current/docs/manualpages/EPS/EPSGetEigenpair.html
>
>An alternative is to do all the computation in complex arithmetic (configure --with-scalar-type=complex).
>
>Jose
>
>
>
>
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