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An open-source MDAO framework written in Python.

OpenMDAO v1.6.4

OpenMDAO v1.6.4 is now available!

Feel free to ask questions on our Stack Overflow tag if you experience any difficulties.

Here are the release notes for 1.6.4:

OpenMDAO Version 1.6.4 Alpha Release Notes
May 10, 2016

* User can get more compact output from check_partial_derivatives via `compact_print=True` argument
* User can call alloc_jacobian() to pre-allocate jacobian with correct sizes for everything when jacobian structure is fully dense
* Setup messages, warnings, and errors are now all delayed and given all that the same time, at the end of setup.
* Components can now raise AnalysisError when a component fails to have solver or driver handle the situation cleanly. Note: solvers and drivers need to be written to handle this correctly
* Systems (Groups & Components) will set a _jacobian_changed flag, so that solver can know if they need to do some extra work.
* Pyoptsparse Driver will catch AnalysisError and pass fail-flag to pyopt-sparse.
* Added error msg to top of run and run_once in case force_fd is changed from its setting pre-setup.
* User can call list_params method on a group to get a list of all the parameters that don’t have any src at that level of the hierarchy.
* Add a test support utility function to check for the presence of fd_options[‘force_fd’]=True in a group.
* Added option to DirectSolver to improve performance by manually assembling the Jacobian.
* Added support for caching the LU factorization to the DirectSolver. This is the default option.
* We now raise an error if more than one objective is added to a driver that does not support multiple objectives.
* User can specify a scaler when adding an output or state. That number is internally used to scale the variable in the unknowns vector.
* User can specify a resid_scaler when adding a state. That number is internally used to scale the resids vector.
* Many documentation fixes and improvements.
* Coming in next release, a model structure viewer.
* Coming in next release, a basic profiler.

Bug fixes:
* Fixed a sign inconsistency in the derivatives systems with Residuals.
* Fixed error-checking for solver maxiter when there are cycles or states.
* Fixed error message for things that shouldn’t be changed after setup to be more user-friendly.
* Fixed bug when distrib comp used with parallel DOE.

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