• Unit conversion now uses definitions in an external file, which can be modified by the user to add new units or unit categories.
• Added user-defines physical constants from a file.
• Improved algorithm used to round graph limits.
• Balloon hints use the font as selected for the Preferences.
• Fixed documentation: wrong formula for histogram goodness of fit (the program was using the right one).

New features:

• A random number generator function rgam, sampling from the Gamma distribution.
• User-defined functions may have descriptions attached, which will show as balloon hints.

Bug fixes:

• Variable buttons now work as documented, i.e., inserting a variable into the Expression Line.

• Cosmetic cleanup of the user interface.

• Visual compatibility with Windows XP.
• Premature clock display in Fit/Goodness operations fixed.
• Loading of status files with different size graph fixed.

• Bug fix: "Illegal functon name" is no longer erroneously reported in user-defined functions.

• Maximum expression length has been increased to 320 characters or 160 elements (numbers, variables, operators) — registered version only.
• Added "default" format setting in the display of variables, arguments, and statistical parameters.
• Kalkulator now removes properly its fonts upon exit (no more error alerts when a new version is installed in a Windows session in which the previous version was running.)
• A number of minor correctons and other changes in Help.

New features:

• Points from outside a given range can be deleted from the Data Buffer.
• Duplicate points (or partial duplicates) can be also deleted.

Minor improvements:

• Coordinate readout has been provided in the Graph Window.
• 0^0 now raises an error (instead of returning 0).
• Subtle improvements to Gamma and factorial accuracy.

Bug fixes:

• Storing polynomial roots in variables now works properly.
• Index and Contents buttons in the Help have been restored.

New features:

• Two interpolation functions added (linear and cubic spline).
• Graphs can be drawn in a separate window.

• User-selectable screen font.
• More decimal digits in Variable Panel and in input dialogs.

• Removed error reported in polynomial equations with three or four identical roots.
• Coefficients from Polymomial Root Panel are now saved.
• Added protection against illegal values in random generator reseeding.
• Fixed the diagnostics given when an illegal value is entered.
• Graph options are now remembered between sessions.

• Maintenance update.

• Some cosmetic touches; no bug fixes or changes in functionality.

• Lots of internal re-engineering and cleanup. New menus.
• New installation program. Registration system changed.
• Option to use more readable hints added.
• Bug fix in the Computer Math Window: cursor now moves freely in the 32-bit, binary mode.
• NOTE: Registered users have to request a new registration key (free of charge) by sending email to andrzej@wrotniak.net, including name and registration number. Thanks.

• A jump to the Kalkulator Web page has been added to the Help menu.
• Bug fix: no more space insertion when entering digits with mouse.

• User-defined functions now take up to four (not three) arguments: nice for distances between points, etc.
• The program can be now minimized to a tray icon.
• A bug crashing sometimes Kalkulator upon startup (non-registered copies only) has been fixed.

• The HOWTO.TXT tutorials have been updated. Some minor cleanups introduced to the program (no new features or bug fixes).

• Kalkulator now detects and works around a bug in some Windows configurations, affecting the accuracy of the processor's Floating Point Unit. It will also detect when the problem is fixed, and adjust itself appropriately.

• Added solving of systems of up to 9 ordinary diferential equations (ODE) of the first order.
• The data file used to store Kalkulator status from one program run to another has been modified so that it will stay version-independent: no need to re-enter everything when you move to a newer version.
• Help buttons have been added to all windows.

• A bug (showing up only in the 16-bit version), not allowing to show a user-defined function, has been fixed.

• Data buffer can be read from a file containing an ASCII table with any number of columns, with X and, if applicable, Y assigned to any of them.
• The number of displayed regression parameters has been fixed.

• Added support (32-bit version) for Chinese, Japanese and Korean Windows 95.
• Fixed the bug (introduced in v2.14) which would not allow to do multiple function plots or to solve systems of non-linear equations.

• Added regresion of 0th degree (horizontal line at average y).
• Fixed the bug in writing user functions to disk (registered version) and in the corresponding entries of the main pop-up menu.

• The result can be now displayed with a precision of up to 18 (not 16) digits.
• The degree symbol key, marked by mistake as "\" in v2.11 is now OK.

• Improvements in numerical integration: for ill-behaved (spiked) functions the required accuracy is now reached much faster.

• Optimization (extremum search) of functions with up to nine arguments (downhill simplex method).
• Fitting a population distribution with any distribution function with respect of up to nine free parameters.
• Fitting a set of XY points with any regression function depending of up to nine free parameters.
• The data buffer size has been increased from 6400 to 64000 (32-bit version only).

• Floating-point formatting cleaned up in data grids (in case anyone noticed...).

• Solving systems of (up to 9) non-linear equations with use of the Newton-Raphson method.
• Goodness of fit for data distribution or regression.
• User-defined functions may have up to three arguments.
• A whole matrix (or vector) can be computed with use of an expression taking row and/or column indices as parameter(s).
• A number of changes in the user interface.

• Double-clicking on the Result Variable is now equivalent to pressing the Enter key (evaluate and store in the displayed variable).
• Fixed a bug in the new "Insert t" feature, inserting t always when the input is done with mouse.

• User-defined functions can now be loaded from, or saved to a disk file, to allow for creation of function libraries.
• Clicking on the line number allows to jump to an expression line selected from a pop-up menu.
• An option to insert the last result as "t" at the beginning of an expression starting from +, –, * or / has been added; the Panel Options window has been appropriately modified.
• Color is used in input dialogs to show the active entry field.
• Sound effect at startup has been removed.

• More physical constants added; some of the old values corrected or made more accurate.

• A separate Result Variable is now assigned to every expression to make chained calculations (miniprograms) easier.
• The Expression Line now stays highlighted after evaluation; any input will replace its contents.
• Introduced an easier method to add a regression line to an existing graph canvas.
• The graph Undo button now works as a toggle.
• The tabbed pages (Function Panel, Variable Panel) have been reworked to provide better look and feel.

• A new feature: simultaneous function graphs for any combination of expression lines, with joint limit evaluation.
• Internal tweak: Use of Windows' resources has been significantly reduced (important for Win3.1 users!).
• New upgrade policy: no time or version number limitation.

• A major new feature: added the Computer Math Panel for computer arithmetics operations. Hex, decimal, octal and binary display, signed and unsigned mode, 8, 16 and 32-bit word length.
• Added missing exponent in Boltzmann constant.

• Fixed the problem with sorting of the data buffer when not scrolled to the top (16-bit version)
• Improved policy of setting default data directories (registered copies only)

• Fixed the problem with using multiple status (.kal) files.

• Bottom width limits for plot range intervals introduced.
• "Stay on Top" option in the Mini Panel mode.

• The harmonic mean function now is defined properly.
• Many small touch-ups in the program and the Help file.

• A minor improvement: autoscroll between expressions added as an option.
• Lots of small touch-ups in the program and in the Help file.

• A new feature: finding roots of polynomial equations of up to the fourth degree.
• A text file with step-by-step examples has been included.

• A major new feature: linear algebra — operations on vectors and matrices, solving of systems of simultaneous linear equations
• Improved Data Editor, using a spreadsheet metaphor
• Right-clicking on a variable button (or on a variable listing in the browser) shows its value with the full accuracy

• Fixed bug causing non-rounded display of some values describing log plot scale.

• Sound effects introduced.

• Expressions can be entered anywhere where numeric values are expected.
• "Minimal layout" option added.
• Physical constants added.

• Workaround around a compiler problem affecting user functions.

• The original release.