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v1.3.1 — April 2019

Documentation Installers Source Release Notes Advertised Version: 1.3.1 Continuous Version: 1.3.1 Release Date: 15 April 2019 Documentation: http://psicode.org/psi4manual/1.3.1/ Availability: Public, GitHub source, CMake build, Conda binary installers Span: 5 + 4 partial PRs Enhancements #1570 (partial) better format exception when run_json encounters error. set_options can be used for local options, e.g., set_options({'scf__d_convergence': 8}). #1578 (1st commit) update schema name to qcschema_[in|out]put, use dtype=2 Molecule in schema, move psi4:qcvars to extras/qcvars.

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v1.3 — February 2019

Documentation Installers Source Release Notes Advertised Version: 1.3 Continuous Version: 1.3 Release Date: 28 February 2019 Documentation: http://psicode.org/psi4manual/1.3/ Availability: Public, GitHub source, CMake build, Conda binary installers Span: 335 PRs, roughly 1065-1558 Major Points of Interest Added native Windows compatibility without the WSL requirement. DFT collocation grids can now be cache in-memory to avoid extra computation and lowering the total cost of DFT by up to a factor of two (#1233).

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v1.2 — July 2018

Documentation Installers Source Release Notes Advertised Version: 1.2 Continuous Version: 1.2 Release Date: 4 July 2018 Documentation: http://psicode.org/psi4manual/1.2/ Availability: Public, GitHub source, CMake build, Conda binary installers Major Points of Interest The DFT kernels were migrated to use LibXC, Psi4 now has 400+ functionals including modern functionals such as wB97M-V. The DFT code was optimized leading up to a 4x speed enhancement on 6 cores. A new Density-Fitted JK backend was written, DF-SCF is now up to 2x as fast.

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v1.1 — May 2017

Documentation Installers Source Release Notes Advertised Version: 1.1 Continuous Version: 1.1 Release Date: 19 May 2017 Documentation: http://psicode.org/psi4manual/1.1/ Availability: Public, GitHub source, CMake build, Conda binary installers New Methods Added analytic RHF Hessians, conventional and density fitted. Added analytic RHF CCSD(T) gradients (no frozen core). Added functional-group and intramolecular symmetry-adapted perturbation theory (F/I-SAPT) capabilities, scripts, and tests. (DOIs: 10.1021/ct500724p, 10.1063/1.4927575) Added high-spin open-shell SAPT0. Note that Ind20,r (and exch counterpart) contains unrelaxed induction.

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v1.0 — July 2016

Documentation Installers Source Release Notes Advertised Version: 1.0 Continuous Version: 1.0 Release Date: 4 Jul 2016 Documentation: http://psicode.org/psi4manual/1.0.0/ Availability: Public, GitHub source, CMake build, Conda binary installers Psi4is, in many ways, a whole new package compared to Psi3. While some libraries and modules remain the same, the majority of the code has been rewritten from scratch based on a powerful set of new libraries written in C++. A totally new Python front-end makes Psi4incredibly user-friendly and automates many common tasks such as basis set extrapolation, composite methods, running the same computation on every molecule in a test set, etc.

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Beta5 — July 2013

Documentation Source Release Notes RN at GitHub link much better formatted than below. Advertised Version: 4.0b5 Continuous Version: 1.0b5 Release Date: 3 Jul 2013 Documentation: http://psicode.org/psi4manual/4.0b5/ Availability: Public, Sourceforge source, Autotools build, No binary This release adds a little additional functionality, fixes several bugs, improves the installation process and the documentation, and adds a couple of new built-in databases. It also includes some work-in-progress that will lead to improvements in the next release.

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Beta4 — Apr 2013

Documentataion Source Release Notes Advertised Version: 4.0b4 Continuous Version: 1.0b4 Release Date: 7 Apr 2013 Documentation: http://psicode.org/psi4manual/4.0b4/ Availability: Public, Sourceforge source, Autotools build, No binary The first public beta release includes all-new, very efficient density-fitted, shared-memory parallel code for Hartree-Fock, DFT, and MP2, and symmetry-adapted perturbation theory (SAPT). We also add new code for MP4, QCISD(T), and G2. New modules performing frozen natural orbital coupled-cluster have been added. Previous PSI3 functionality for coupled-cluster energies and properties, and arbitrary-order CI and MBPT energies is also available.

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Beta3 — Oct 2012

Documentation Source Release Notes Advertised Version: 4.0b3 Continuous Version: 1.0b3 Release Date: 23 Oct 2012 Documentation: http://psicode.org/psi4manual/4.0b3/ Availability: Private, No Sourceforge source, Autotools build, No binary This version of PSI contains the following features: Hartree-Fock, DFT, MP2, CI, CC, PSIMRCC, ADC(2), SAPT, DCFT, and optimized-orbital MP2 and MP3. Density-fitting is available for Hartree-Fock, DFT, MP2, and SAPT, and is much faster than the conventional algorithms. Most popular functionals are available, but only M05 and M05-2X are available among meta-GGA’s.

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Beta2 — May 2012

Documentation Source Release Notes Advertised Version: 4.0b2 Continuous Version: 1.0b2 Release Date: 6 May 2012 Documentation: http://psicode.org/psi4manual/4.0b2/ Availability: Private, No Sourceforge source, Autotools build, No binary The Beta2 release fixes the following bugs reported by beta testers: Boost library compilation inside PSI4 now uses the user’s PYTHON environmental variable, to help avoid the situation where one version of Python is used for Boost, and another for PSI4, leading to linker errors.

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Beta1 — Feb 2012

Source Release Notes Advertised Version: 4.0b1 Continuous Version: 1.0b1 Release Date: 2 Feb 2012 Documentation: None Availability: Private, No Sourceforge source, Autotools build, No binary

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