Additions

Unlike other Python packages which merely wrap the broken OpenSeesPy package, xara employs a completely new interface layer that is implemented in C++.

• No global state. It is well know that software should not exhibit global state.

  • https://www.cs.utexas.edu/~EWD/transcriptions/EWD10xx/EWD1036.html

  • https://testing.googleblog.com/2008/08/root-cause-of-singletons.html

  • https://embeddedartistry.com/fieldatlas/the-problems-with-global-variables/?utm_source=chatgpt.com

  • https://betterembsw.blogspot.com/2014/06/minimize-use-of-global-variables.html

  • isocpp/CppCoreGuidelines

  • https://isocpp.org/wiki/faq/coding-standards#global-vars

  • https://www.learncpp.com/cpp-tutorial/why-non-const-global-variables-are-evil/

• Improved printA for obtaining structural matrices:

  • does not require FullGen solver; now all one needs to do is call model.getTangent(). This is possible due to the new consolidated memory ownership model.

  • -mck options

• Improved print command

  • new -registry option.

  • more reliable JSON printing

  • includes MP_Constraint information

• Add -det option to static integrators:

  • ArcLength

• add -det capability to solvers:

  • FullGenLapack, Umfpack, BandGenLapack

• Verbosity control

• new export command in Python and Tcl, when run through Python

• new invoke Tcl command and Python constructs

• new progress command in Tcl

• new = command, fixes vexing operator precedence in expr

• Minimized use of exit() syscalls.

Quality of Life

xara features several small “quality of life” improvements. These include

• Improved error messages and tracebacks. Error messages have been extensively reworked to allow for colorful and informative error tracebacks. For example, instead of:

  

  one now has: