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### Access to the set of linear equations / Hines matrix

Posted: **Wed May 09, 2012 1:56 pm**

by **roybens**

Hello,

Is there any way to access the Hines matrix in hoc?

That is, the almost tridiagonal set of linear equation, used in, e.g. the cnexp model.

Best regards,

Roy

### Re: Access to the set of linear equations / Hines matrix

Posted: **Thu May 10, 2012 7:34 am**

by **hines**

http://www.neuron.yale.edu/neuron/stati ... ml#fmatrix
One should call fcurrent() prior to fmatrix() to ensure the matrix is setup.

The matrix printed is for thread 0.

The 4 numbers printed on each line are

compartment index

jacobian element for parent in node equation (ClassicalNODEB)

jacobian element for node in parent equation (ClassicalNODEA)

diagonal element (NODED)

right hand side (NODERHS)

See nrn/src/nrnoc/fadvance.c

### Re: Access to the set of linear equations / Hines matrix

Posted: **Thu May 10, 2012 12:58 pm**

by **roybens**

Thanks a lot it is very helpfull