Re: [Bug-gsl] error in looking up gsl_eigen_nonsymmv_alloc

[Patrick Alken]

You may have 2 versions of the gsl library installed on your system. 
When running your program it may be detecting the older library which 
doesn't contain the function.

Try doing: ldd 'your_executable'

and make sure that the gsl library is pointing to the right one (1.15)

On 11/13/2011 09:28 PM, address@hidden wrote:
> Hi,
>
> I write this program:
>
>
> #include<stdio.h>
> #include<gsl/gsl_math.h>
> #include<gsl/gsl_eigen.h>
>
> int main()
> {
>    double data[]= {-0.500000,0.866025,
>                  -0.866025,-0.500000};
>    int i;
>    gsl_matrix_view m = gsl_matrix_view_array(data,2,2);
>    gsl_vector_complex *eval=gsl_vector_complex_alloc(2);
>    gsl_matrix_complex *evec=gsl_matrix_complex_alloc(2,2);
>
>    gsl_eigen_nonsymmv_workspace * w = gsl_eigen_nonsymmv_alloc (2);
>    gsl_eigen_nonsymmv(&m.matrix, eval, evec, w);
>
>    gsl_eigen_nonsymmv_free(w);
>
>    for(i=0;i<2;i++){
>     gsl_complex eval_i = gsl_vector_complex_get(eval,i);
>     printf("eigenvalue = % 5f + I % 5f \n",GSL_REAL(eval_i),GSL_IMAG(eval_i));
>
>    }
>
>    gsl_vector_complex_free(eval);
>    gsl_matrix_complex_free(evec);
>
>    return 0;
> }
>
> It complies okay. When I run it I get the error:
> ./cplxdiag: symbol lookup error: ./cplxdiag: undefined symbol:
> gsl_eigen_nonsymmv_alloc
>
> I am using the version 1.15. This error is not there in an earlier version
> which I use in my laptop. There it gives me the correct result:
>
> eigenvalue = -0.500000 + I  0.866025
> eigenvalue = -0.500000 + I -0.866025
>
> It would be very nice if this can be fixed as soon as possible.
>
> with best regards,
> Debasish Banerjee
>
> Post-Doctoral Fellow
> Albert Einstein Centre for Fundamental Physcics,
> Institute of Theoretical Physics,
> University of Bern.
>
>
>
>
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