Published on *OpenMx* (http://openmx.psyc.virginia.edu)

By *wuhao_osu*

Created *12/07/2011 - 17:34*

Wed, 12/07/2011 - 17:34 — wuhao_osu [1]

Hi,

It would be very helpful if the following can be done in OpenMx:

1. Evaluate (for all cases at once) an mxAlgebra that involves definition variables. I think currently one can only evaluate such an mxAlgebra for a single case.

2. Define an user specified objective function that is the sum of a casewise function of the data and parameters. I think currently the casewise function can be defined with definition variables, but is there a way to sum them?

3. Supply the gradients of the target function and constraints, and the approximate Hessian. I can see mxOption can change the option of NPSOL to accept user defined gradients and Hessian, but there seems no way to supply them.

Thanks.

Hao

**Links:**

[1] http://openmx.psyc.virginia.edu/users/wuhaoosu

[2] http://openmx.psyc.virginia.edu/thread/697

[3] http://openmx.psyc.virginia.edu/thread/624

[4] http://openmx.psyc.virginia.edu/forums/openmx-help/openmx-general-help