Release 0.9.17 - Rational approximation, indexing, Android fixes

This incremental release delivers new features and fixes a number of bugs.

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New features

• Add →Qπ command for rational approximation with π, √n, ln(n) and e
• Apply →Q and →Qπ to numbers in expressions
• Add array/list indexing support in algebraic expressions e.g. 'L(1)'
• Add ability to Store / Copy to L(1)
• Add "real" ConstantName and ConstantValue commands

Bug fixes

• Fix parentheses around exponents in graph rendering of '(a+b)^(c+d)'
• Fix label for ToRelativeUncertainty, →RelRnd instead of →RelUnc
• Fix command alias mapping for RNrm
• Improve parsing of implicit multiplication for a number of edge cases
• Fix utf8_next for garbage bytes following ASCII characters
• Fix unsatisfied symbol errors with gcc/emcc in the WASM build
• Save Android system state when app is suspended or hidden
• Ensure Android help resources are extracted and available at runtime
• Restore image testing functionality in the test framework
• Updated test images that had become obsolete
• Report errors when saving reference files in tests
• Avoid stack corruption / crash when parsing malformed help index
• Fix computation of DFC(2.3)
• Fix null-pointer crash if the multiple equation solver fails

Enhancements

• Constrain →Q and →Qπ behavior to FIX/SCI/ENG setting (like HPs)
• Minor optimization for program::run
• Save about 3.4K of RAM on physical devices
• Speed up test runs while increasing default wait time for stability
• Documentation cleanup and additions, add more RPL examples
• Add clear build-time error message when a help topic exceeds 80 characters
• Add demo for interactive menu use
• Optimize away redundant argument checking
• Documentation for DCF and DCF2F

Signed-off-by: Christophe de Dinechin christophe@dinechin.org

Release 0.9.16 - Factorization, precision fixes, and documentation

This release adds prime and factorization features, improves numeric precision,
and expands simulator and user documentation.

New features

• Add IsPrime, Factors, PrevPrime and NextPrime commands
• Add MaxFactorsBits and MaxFactorIterations settings for factorization
• Add TRIGSIN command for Pythagorean identity rewrites
• Add a Unix man page and simulator documentation
• Add simulator recorder dump on F16; move demo playback to F13-F15
• Paint navigation arrows in SHOW
• Accept CR/LF line endings when reading Windows files
• Display keyboard access paths in help for commands

Bug fixes

• Fix expm1 precision loss for small arguments, including complex values
• Fix ln1p precision loss for small arguments
• Fix shift behavior after transient alpha, and support shift/xshift for transalpha
• Reset show_x and show_y when exiting SHOW
• Ensure the simulator creates the screens directory when needed
• Fix an infinity optimization regression in arithmetic
• Add missing null-dereference checks in factorization code
• Treat ^ as right-associative like on the HP50G

Enhancements

• Refactor and optimize the decimal factorization code path, with expanded tests
• Add conversion support to float and double in algebraic code
• Update to recorder v1.2.3
• Add documentation updates (DeepWiki reference, legal notice updates)
• Add build preparation for upcoming make-it-quick integration
• Welcome several new authors to the team, see AUTHORS file
• Add LEGAL-NOTICE.md about compliance with California and Colorado laws
• Add menu entries for hypot and atan2

Signed-off-by: Christophe de Dinechin christophe@dinechin.org

Release 0.9.15 "Myriam" - GitHub automation, portability

This release focused on GitHub and GitLab automation, and provides automated macOS, Linux, Windows and Android builds. You can still download the artefacts the usual way, but there should be new links attached to the release as well with artefacts generated through this new GitHub workflow.

New features

• GitHub automation automatically builds various packages
• Preparation for GitLab automation (still largely untested)
• Windows simulator
• Android package
• WebAssembly application (WASM) now has help and configuration files
• DM42n build (differs from DM32 only in the help files)
• Dockerfile to create a container with the simulator
• Add ρ in RangesMenu
• Accept units when creating a range from components
• Add Range→ command that expands ranges with units

Bug fixes

• Corrected typos in some builtin constants
• Spelling and grammar fixes in documentation
• Build failure for wasm due to use of source, a bash-only syntax
• WebAssembly application no longer uses 100% CPU
• The simulator can now be launched from any directory
• The macOS simulator correctly launches from the Finder or Dock
• Portability bug fixes in the DMCP emulation
• The Settings menu is now correctly refreshed after ResetModes
• Fix double-shifted arrow keys
• Correctly show help for Swap, Negate, and Cycle
• Fix order on stack for Explode on a range value
• Android build bug fixes

Enhancements

• Add osx program in lauch.json
• The simulator no longer overwrites configuration files by default
• Builds that use gcc now enable more warnings
• Simplify shift-handling logic

Release 0.9.14 "Latran" - Android preparation

This is a very minor release with bug fixes notably for Android

New features

• The screen updates when rendering and PICT is set

Bug fixes

• Wait for durations longer than 1 second now works in simulator
• →%Range, →∆Range and Range→ now use displayed values
• 0.9.13 regression, leftover input value after error during plotting

Improvements

• Semi-working Android build

Release 0.9.13 "Saints" - Truth plot, colors, and bug fixes

This release focuses on graphics and a few user-reported bug fixes

New features

• bins computes frequency bins from statistics data
• Res sets the resolution when plotting
• HistogramPlot draws a histogram (frequency) plot from an array
• HSV generates a color pattern from hue, saturation and value
• Color generates a color pattern from an object, including names
• TruthPlot renders a truth value plot, with grayscale and color options
• Add a new XYPlots demo illustrating TruthPlot variants

Bug fixes

• Update the screen in Show when Pict is set
• Fix crash in Date+ when adding invalid dates
• Correctly update the UserModeMenu and annunciator when changing User mode
• The STO operation now works sensibly on flags
• Fixed a rare on-startup crash running tests in the debugger
• Invalidate the font cache when changing settings (notably FixedWidthDigits)
• Fix transient Input validation errors after text-editor errors
• Remove two extra parentheses in the documentation for settings

Improvements

• Transient Alpha now preserves existing Alpha / Lowercase mode
• Remove dependency on external crc32 utility, now use a local implementation
• Remove dependency on tac, replace it with tail -r
• Rendered graphics are now preserved in case of auto-power-off
• Avoid transient build errors on missing help directory
• Add documentation for ResetModes and usage example for Modes
• Negative dates now show as BC instead of with a minus sign

Release 0.9.12 "Alive" - Return to active duty

This release focuses on simulator improvements, bug fixes, and enhanced mathematical functionality, marking a return to active development and maintenance after the hiatus caused by Christophe de Dinechin's move.

New features

• Enhanced trigonometric functions with exact angle reduction when possible
• Improved simulator graphics by smoothing the output when rescaling

Bug fixes

• Compute Julian day number conversion with negative Gregorian years
• Fixed crash in lgamma function on DM32 / DM42n platforms
• Fixed undefined symbol issue in WASM builds
• Fixed platform-specific compilation errors on Android
• Fixed incorrect simplification for sqrt function
• Fixed display of checksum in the Info box
• Fixed hang when reading CSV files containing unit objects
• Do not reorder mean and standard deviation parts in uncertain numbers
• Avoid possible null-dereference in several statistical functions

Improvements

• The simulator now preserves a fixed aspect ratio while resizing
• The simulator now builds cleanly on Qt5
• Added 2 new tests for Julian day number conversion
• Updated copyright year in About message
• Improved description of "Julian day number" commands in documentation
• Improved build system to select qmake6 on Arch Linux
• Show →Num spelling in compatibility mode
• Updated AUTHORS list
• Remove documentation for newRPL commands UDEFINE and UPURGE
• Improve implementation status section of the documentation

Release 0.9.11 "Prayer" - Uncertain numbers

This release implements arithmetic and basic functions on uncertain numbers.
This propagates uncertainty using quadradic superposition, in a way similar to OpenRPNCalc, with a generalization for correlated variables.

New features

• Arithmetic and basic functions on uncertain numbers
• Add support for complex-valued unit objects, e.g. 5+3ⅈ Ω
• Add support for range-valued unit objects, e.g. 1…3 Ω
• Support arithmetic operation on infinities, e.g. ∞ 42 +
• Add commands to generate mathematical constants (π, ℮, ∞ and −∞)
• Parsing and editing of ranges containing infinities
• Accept infinities in →Range and variants
• Comparison of infinite values and finite values
• Add union and intersection commands for ranges
• Add operations to build ranges and uncertain numbers from components
• Add derivative for erf and erfc

Bug fixes

• Do not leave bad expressions behind after errors on ranges
• Obey the InfinityError flag when detecting divide-by-zero in ranges
• Avoid crash pushing null pointer after unit evaluation error
• Avoid spurious inconsistent units error due to date computations
• Null-protection in variadic list::make, fixes null-deref crash

Improvements

• Accelerate error exit from arithmetic operations
• Render uncertain numbers as 110±σ15 instead of 110±15σ
• Accept − as valid input in constants (for −∞)
• Record performance data for iPhone 16
• Change spelling to →σRange in RangeMenu
• Use ASSERT for divide by zero inner checks (remove dead code)

Release 0.9.10 "Best" - Ranges and documentation

This release is primarily a refinement of ranges and a documentation update.

New features

• Always display infinity ranges with range notation
• Add constant for -∞
• Add support for ranges in Explode / Obj→
• Add support for delta and percent ranges in ToDecimal
• Allow Copy to target a local variable or setting
• Support True and False in →Num

Bug fixes

• Replace log with ln, make log be base-10 logarithm
• Check zero-divide in ranges
• Fix the implementation of trig functions for ranges
• Fix incorrect command associated to the %T alias (should be %Total)
• Adjust help for log10 and ln
• Avoid pushing a null pointer on the stack on error evaluating constants
• Add missing Ⓒ sign in uncertainty for Epl
• Fix constant evaluation referencing this after it may have moved
• Report missing current directory in Purge
• Report errors when purging invalid objects in Purge and PurgeAll
• Avoid ClearThingsMenu in tests, the key maps to forward delete in editor

Improvements

• keyboard: Update layout to include σ character
• Remove the state/Test.48S file, it's not longer relevant
• Add constant case to object::is_negative
• Add DATE- as an alias for DDAYS
• Add PgAll as an alias for PurgeAll
• More systematic purging of environment and variables between tests
• Add check in test suite that we actually purged special variables
• Refresh authors list
• Move documentation for PPAR to plot.md
• Avoid date conversions during constant evaluation
• Accelerate and improve the display of constant values in menus
• Add launch.json and tasks.json build configuration generated by Cursor
• Send a START_TEST command at start of test, refresh simulated battery
• Cursor-assisted review of missing command documentation
• Cursor-assisted generation of content in the Quickstart guide
• Cursor-assisted improvements to grammar and spelling
• Documentation and examples for Blank variants
• Documentation and examples for Gray and RGB
• Documentation and examples for PMIN, PMAX, XRNG, YRNG
• Documentation and examples for Eq and equations
• Add examples for list sum, product and difference commands

Release 0.9.9 "Headrest" - Ranges

This release introduces four range types to perform computations on ranges, and fixes serious graphical regressions that remained undetected by the test suite.

New features

• Three range types, known as interval (1…3), delta range (2±1) and percent range (2±50%), for which arithmetic and most operations have been implemented.
• An uncertain type (2±3σ), for which arithmetic and operations are not implemented yet.
• A new flag, ShowAsDecimal, presents integers and fractions using a decimal format. This is useful for people working in banking, who can use 2 FIX mode for all values. In that mode, 50 will display as 50.00, and 3/4 will display as 0.75. The Show command still shows the original value.
• The simulator now strips CR/LF when pasting on Windows.
• The ^ operator now operates on arrays

Bug fixes

• The image comparison code has been broken since January. As a result, various regression regarding graphical output remained undetected.
• One particular case is the generation of incorrect BMP files after the default format for graphic objects was switched to bitmap.
• A possible crash was eliminated when converting a number to integer, to fraction or to decimal.

Improvements

• The σ (used for uncertain numbers) replaces ρ (unused at the moment) on the keyboard in alpha mode.

Release 0.9.8 "Crowdfeeding" - Bug fixes

This is a minor release with bug fixes.

Bug fixes

• isolate: Fix patterns for exponentials and logs
• doc: Fix list of currently supported models
• derivation: Allow simplification when matching against constant
• solver: Do not emit type error when guesses are constants
• expressions: Correctly substitute names in list substitutions
• menu: Fix label for ConstantsMenu in MainMenu

Improvements

The INSTALL.md file now describes the installation procedure.