Release 0.9.2 "Temptations" - Multi-variate solver, documentation

[c3d]

This release introduces a true multiple-variables solver, additional matrix operations, and extends the RPL programming documentation.

New features

• The Root command now selects a true multi-variable solver (Jacobian solver), capable of solving systems of equations with multiple variables, even when variables cannot be isolated one at a time, for example solving { 'sin(x)=y' 'sin(y)=x+1' }. As a result, the DB48x Root command now covers the functionality provided by the HP50G's ROOT, MROOT and MSLV .
• Compatibility for MSLV is preserved thanks to a dedicated command, which like the HP50G leaves input equations and variables on the
  stack.
• Add RNRM and CNRM (row and column norms) commands for matrices.
• Add TRN and TRAN commands (matrix transpose, with or without conjugate)

Bug fixes

• Add several missing images used by the test suite to the git repository, e.g. for the TVM menu.
• Fix rare bug parsing lists causing a validation error
• Fix theoretical risk of memory corruption in det
• Solutions found by the solver no longer depend on the existence and value of global variables by the same name prior to solving
• Emit "Interrupted" error when interrupting the solver
• Fix bug comparing decimal zero with small decimal values

Improvements

• Add a section with RPL programming examples, seeded with examples from Chapter 1 of the HP50G Advanced Reference Manual.
• Add documentation about program objects, text, symbols and comments.
• Update documentation for complex numbers, e.g. ℝ→ℂ command.
• Add documentation for abs
• Add links to "Rules" in constant uncertainty section
• Add a few additional tests in the documentation
• Split instrumentation for the three solver algorithms.
• The solver now uses the display precision to limit the precision of the desired result, like the integrator and like HP calculators.

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This discussion was created from the release Release 0.9.2 "Temptations" - Multi-variate solver, documentation.

[geocolumbus]

I pulled down the project on my MacBook Air, built it and ran the simulator - DB48X 0.9.2Z. BUILD.md instructions were spot on, and running the simulator on my Mac is awesome! I have a Swiss Micros DM42n enroute from Europe so I'll load it on there next. I am thinking of ways I might contribute but this is a sophisticated project and the bar is high. I will try the new root solver. I wonder if it could be compiled to run on an ESP-32 architecture. It would be fun to make my own HP48GX style calculator and use a candy-bar phone display to display a 28 line stack lol. Anyway, your efforts are appreciated and admired. Thank you.