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update release date for 1.11.0
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swryan committed Aug 8, 2024
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# Release Notes for Dymos 1.11.0

August 09, 2024
August 08, 2024

Dymos 1.11.0 includes the initial implementation of the Birkhoff transcription and a number of other significant improvements. These improvements have focused on the ability to the user to switch transcriptions or control types with a minimal change to their scripts.

### Unification of controls and polynomial controls

The separate APIs for controls and polynomial controls are no more, in favor of the `set_control_options` or `add_control` methods can be used to either add a standard "fully collocated" control or a "polynomial" control. Methods `set_polynomial_control_options` and `add_polynomial_control` are deprecated.
The separate APIs for controls and polynomial controls are no more, in favor of the `set_control_options` or `add_control` methods that can be used to either add a standard "fully collocated" control or a "polynomial" control. Methods `set_polynomial_control_options` and `add_polynomial_control` are deprecated.

### set_time_val, set_state_val, set_control_val, and set_parameter_val

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Dymos had previously been calling `allgather` excessively under MPI which could
cause performance issues during setup.

Finally, Trajectory.simulate() should now work correctly under MPI so that results can
Finally, Trajectory.simulate() should now work correctly under MPI so that results can
be checked with explicit integration when working under MPI.

## Backwards Incompatible API Changes & Deprecations
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Version 1.6.1 of Dymos addresses bugs described below.

This release also includes the start of an implementation to allow calculated expressions to be used as
This release also includes the start of an implementation to allow calculated expressions to be used as
constraints and timeseries outputs, but this feature is still undergoing development and documentation.

## Backwards Incompatible API Changes & Deprecations
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* Added small changes to improve coverage. [#809](https://github.com/OpenMDAO/dymos/pull/809)
* Fixed CI dependency issues based on some broken jupyter-book dependencies. [#812](https://github.com/OpenMDAO/dymos/pull/812)
* Various code cleanup items added. [#807](https://github.com/OpenMDAO/dymos/pull/807)
* Made a few minor cleanups for the cartpole example. [#815](https://github.com/OpenMDAO/dymos/pull/815)
* Made a few minor cleanups for the cartpole example. [#815](https://github.com/OpenMDAO/dymos/pull/815)

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# Release Notes for Dymos 1.5.0
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## Enhancements

* Users can now pass `simulate_kwargs` from `dymos.run_problem`. [#720](https://github.com/OpenMDAO/dymos/pull/720)
* Added `set_parameter_options` method to `Trajectory` for better API consistency. [#721](https://github.com/OpenMDAO/dymos/pull/721)
* USatm1976Comp now accepts altitude as either geopotential or geodetic. [#735](https://github.com/OpenMDAO/dymos/pull/735)
* Disabled reports by default for subproblems under simulate and ExplicitShooting. [#741](https://github.com/OpenMDAO/dymos/pull/741)
* Constraints are now applied directly to timeseries outputs, and several other constraint improvements. [#743](https://github.com/OpenMDAO/dymos/pull/743)
* Added `set_parameter_options` method to `Trajectory` for better API consistency. [#721](https://github.com/OpenMDAO/dymos/pull/721)
* USatm1976Comp now accepts altitude as either geopotential or geodetic. [#735](https://github.com/OpenMDAO/dymos/pull/735)
* Disabled reports by default for subproblems under simulate and ExplicitShooting. [#741](https://github.com/OpenMDAO/dymos/pull/741)
* Constraints are now applied directly to timeseries outputs, and several other constraint improvements. [#743](https://github.com/OpenMDAO/dymos/pull/743)

## Bug Fixes

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