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An open-source MDAO framework written in Python.

OpenMDAO v1.7.0

OpenMDAO v1.7.0 is now available!

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

Here are the release notes for 1.7.0:
OpenMDAO Version 1.7.0 Alpha Release Notes
June 30, 2016

Backwards-Incompatible Change:
1. ‘fd_options’ is now ‘deriv_options’ in systems.
2. New ‘type’ option allows the user to select between analytic, finite difference, or complex step.
3. The ‘force_fd’ option is no longer needed because of type.
4. The ‘complex_step’ choice has been removed from the ‘form’ option.
5. The ‘step_type’ option is now ‘step_calc’.
6. New explicit options ‘check_type’, ‘check_form’, ‘check_step_calc’, and ‘check_step_size’
allow you to control the fd check during check_partial_derivatives.
7. Old code will still work, but will raise deprecation warnings.

* NAS access component
* The output of check_partial_derivatives has been modified so that absolute or
relative errors that exceed a tolerance are flagged with a ‘*’.
The tolerances can be specified via call arguments.
* User can now specify a scaler on any residual by specifying a resid_scaler during add_state.
OpenMDAO see the residual divided by this number.
* A new Model Structure Viewer has been added for viewing the data dependency of your model.
* Updated our Kriging surrogate model based on Sci-kit learn’s Kriging module.
* Added support for parallel DOEs using multiprocessing.
* Converted NREL Tutorial from OpenMDAO 0.1x to OpenMDAO 1.x
* The default Line Search for the Newton solver is now None.
The Backtracking Line Search has been overhauled to use the Armijo-Goldstein for termination.

Bugs fixes:
* Fixed a bug in the lower limiting for state variables.
* Fixed a bug in the KSP solver related to relevance reduction.
* Fixed a bug in fd partials checking.
* Fixed a bug in Radians to Degrees unit conversion.
* Fixed a bug in Newton Backtracking to ignore pass_by_obj variables.
* Fixed where using `abs` in ExecComp expression gave bad derivatives.

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