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CHANGELOG.md

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Changelog

All notable changes to the GEKKO project are documented in this file.

Unreleased

Added

Changed

v0.2.8 - Version 0.2.8 Stable Release, Date: 2020-08-11

Added

  • Added documentation for fix_initial, free_initial, fix_final, and free_final.

Changed

  • Updated documentation for Connection
  • Fixed bug with lb and ub not used by FVs and MVs during declaration

v0.2.7 - Version 0.2.7 Stable Release, Date: 2020-08-05

Added

  • New functions fix_initial, free_initial, fix_final to help with specifying degrees of freedom for common changes to the default fixed / free specifications.
  • Additional documentation for modes of operation
  • Matrix (2D) optimization AX=B example problem test_matrix.py
  • Example 2nd order differential equation
  • Example 3rd order differential equation with parameter estimation
  • A few other examples for testing

Changed

  • Lower and Upper bounds for Param
  • Fixed axb function with dense Ax=b (from incorrect A^T x=b)
  • Upgrade Param so that new value updates the values in the CSV file.

v0.2.6 - Version 0.2.6 Stable Release, Date: 2019-11-12

Added

  • New integral function m.integral and documentation

Changed

  • Local MacOS solve with linked static gcc-gfortran lib
  • Changed shell=False for IPython notebooks in Windows with local subprocess call

v0.2.5 - Version 0.2.5 Stable Release, Date: 2019-11-11

Added

  • Optional E matrix for state_space function: E dx/dt = Ax+Bu
  • Re-implemented changes to if2 and sos1 that were removed from v0.2.4

Changed

  • Equation accepts single equation, list, or tuple
  • Improved error message when remote server unreachable
  • Fix state_space function for input D when not None

v0.2.4 - Version 0.2.4 Stable Release, Date: 2019-11-7

Added

  • New Special Ordered Set (SOS1) model
  • New example problem that uses the SOS1 model
  • New MATLAB interface to Gekko
  • New bspline options (smoothing factor, order in x and y directions)
  • New if2 function that uses an MPCC switch (m.sign2)
  • New Maximize and Minimize functions (Obj minimizes)

Changed

  • Bug fix in bspline that prevented x and y of different sizes
  • Removed Windows command window pop-up with local mode

v0.2.3 - Version 0.2.3 Stable Release, Date: 2019-08-15

Stable release

Added

  • Improved m.fix function to allow specification changes beyond just dynamic mode
  • Added m.free function to change a fixed value into a calculated value for both steady state and dynamic modes
  • Additional example of the Chemical library use for a simple blending problem

Changed

  • Improved variable initialization to allow variable names, GK_Value, and number types
  • m.Connections to support fix / free (calculated) specifications
  • Updated gekko to support new functions in APM 0.9.1
  • Default phase in the Chemical library changed from vapor to liquid
  • Use app.communicate instead of readline to avoid filling up child buffer and creating lock for remote=False solve

v0.2.2 - Version 0.2.2 Stable Release, Date: 2019-07-17

Stable release

Added

  • Additional example problems, test suite
  • New Chemical module - see test_thermo.py and test_chemical.py in examples
  • m.remove() function to delete application directory
  • m.delay() as a times series delay model
  • Added MATLAB examples for calling Gekko functions
  • Documentation pages for Chemical module and Machine Learning module (rst files)

Changed

  • Improved documentation for model building and logical conditions
  • Modified Brain (Machine Learning) capabilities - see test_brain.py in examples

v0.2.1 - Version 0.2.1 Stable Release, Date: 2019-05-10

Stable release

Added

  • APM MacOS local executable v0.8.9

v0.2.0 - Version 0.2.0 Stable Release, Date: 2019-05-04

Stable release

Added

  • Additional example problems, test suite

Changed

  • APM Windows local executable v0.8.9
  • APM ARM local executable v0.8.9
  • APM Linux local executable v0.8.9

0.2rc6 - Version 0.2 Release Candidate 6, Date: 2019-04-15

Added

  • New axb object for Ax=b, Ax<b, and Ax>b linear equations
  • New qobj object for quadratic objectives 0.5 x^T A x + b^T x
  • New if3 conditional statement that translates conditional statemment to Mixed Integer problem

Changed

  • New APM 0.8.9 local executable with axb and qobj improvements

0.2rc5 - Version 0.2 Release Candidate 5, Date: 2019-04-03

Added

  • New thermo objects
  • New vsum for vertical (data direction) summation for IMODE=2, IMODE=4+
  • New sum for more efficient summation in GEKKO with APMonitor object
  • New APM 0.8.8 local executable for IMODE 7 bug fix
  • New PWL (Piecewise linear) object

Changed

  • Improved sysid (System Identification) for fast identification when not constrained
  • Write values from JSON for Parameters on solver exit. It was previously ignoring Param values. This is needed for Thermo objects that are constants.
  • Bug fix for y=m.Var(x.value) in gk_operators.py

Removed

  • None

0.1 - Version 0.1 Stable Release, Date: 2019-03-01

Initial stable release

0.1rc7 - Version 0.1 Release Candidate 7, Date: 2019-02-01

Final 0.1 release candidate

Added

  • System identification and ARX model support as new objects

0.1rc4 - Version 0.1 Release Candidate 4, Date: 2019-02-12

0.1 release candidate 4

Added

  • Additional APMonitor object support
  • Support for ARM processors

0.1b2 - Version 0.1 Beta 2, Date: 2018-11-13

0.1 beta release 2

Added

  • Additional GUI support

Changed

  • Remote option with GEKKO initialization, not solve command

0.1a2 - Version 0.1 Alpha 2, Date: 2018-03-28

0.1 alpha release 2

Added

  • Initial GUI support

0.0.1a1 - Version 0.0.1 Alpha 1, Date: 2018-01-05

Initial GEKKO public release, alpha version