
KALKULATOR - VERSION HISTORY
============================

VERSION 2.19 - 98/11/06

   Fixed bug, preventing (in the 16-bit version, at least) from
   showing a user-defined function.

VERSION 2.18 - 98/09/30

Improvements:

   Data points read from the Data Edit Window can be supplied in a
   file with any number (not just one or two) columns.

Bug fixes:

   The number of regression parameters displayed in the Parameter
   Panel is now always correct.

VERSION 2.16 - 98/06/09

   Compatibility with the Korean, Japanese and Chinese versions
   of Windows 95 (32-bit version).

   Fixed bug (introduced in v2.14) not allowing to perform multiple
   function plots or to solve systems of nonlinear equations. Oops.

VERSION 2.14 - 98/05/28

Minor improvements:

   Regresion of 0th degree (horizontal line at average y) added.

Bug fixes (registered version only):

   User function entries in the main pop-up menu now respond to clicks
   (they worked OK in the Main Menu; this is why nobody noticed).

   Single-argument user functions now are saved to disk OK.

VERSION 2.12 - 98/05/13

Minor improvements:

   Result display now possible with accuracy up to 18 (not 16) digits.

   Added auto-detection for floating-point coprocessor accuracy loss.

Bug fix:

   The degree button now has the right symbol on it.

VERSION 2.11 - 98/04/17

Small improvements:

   The integration algorithm now better handles ill-behaved functions.

   New display fonts.

VERSION 2.10 - 98/03/23

Major new features:

   Extremum search for multi-argument (up to 9 parameters) functions.

   Multi-parameter curve and histogram fitting.

Minor changes:

   The [Zap] buttons now clear all variables (or all arguments, or
   all parameters) in the Variable Panel.

   The argument variables t1..t9 have been renamed to v1..v9 to avoid
   similarity to user function arguments, t1..t3,

   Polynomial regression shows the residual sum of squared deviations
   in the Result Display.

   The maximum size of the Data Buffer in the registered version
   increased from 6400 to 64000 points (32-bit only).

VERSION 2.01 - 98/01/19

A minor maintenance update:

   Floating-point formatting cleaned up in data grids.


VERSION 2.00 - 97/12/22

Major new features:

   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:
   ff(t), ff(t1,t2), ff(t1,t2,t3).

   A matrix or a vector can be computed with use of an
   expression taking row and/or column indices as parameter(s).

Secondary improvements:

   The bottom line of operation buttons has been replaced with
   a tabbed notebook. The Expression Line now shows 64 chars.

   Double-clicking on the expression number will jump to line 1.

   The Variable Panel now has a new page, the Arguments Page. It
   shows the arguments used (and computed) in the non-linear
   equation solving operation.

   Each of the lists in the Variable Panel now has its own [Digit]
   button for independent display format setting. [Get] and [Zap]
   have been added in the Parameter Page.

   The Enter key now works the same way regardless of whether the
   graph canvas is being shown or not. To hide the graph canvas,
   use the Pause key (or Shift-Enter, or Shift-Escape). Pressing
   the Pause key when the canvas is not shown will bring it up.

VERSION 1.50 - 97/03/15

   Double-clicking on the Result Variable is now equivalent to
   pressing the Enter Key (evaluates the expression and stores
   the result in the displayed variable).

   Bug fix: "t" is no longer inserted at the beginning when not
   appropriate (mouse entry only).

VERSION 1.49 - 97/02/15

   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 has been appropriately modified.

   Color is used in input dialogs to show the active entry field.

   Sound effect at startup has been removed.

VERSION 1.48 - 97/01/31

   Changes in physical constants: new values added, some of the
   old ones corrected or revised.

VERSION 1.47 - 97/01/02

   The two missing pixels at the bottom of the Display Line
   have been restored (16-bit version only).

   Font files reverted from .FNT to .FON standard to avoid
   problems in the 16-bit version.

VERSION 1.45 - 96/12/26

   A Result Variable can be now assigned to every expression;
   this makes chained calculations easier.

   The Expression Line now stays highlighted after an expression
   has been evaluated; its contents will be erased after any new
   input.

   Introduced a simpler method to add a regression line to an
   existing graph canvas.

   The graph Undo button now works as a toggle.

   The tabbed control widgets in the Main Panel have been
   reworked (different look and feel).

   The program will now find the fonts even if the working
   directory is not set to the program directory.

VERSION 1.42 - 96/11/20

   A new feature: simultaneous function graphs of any combination
   of expression lines, with joint min/max evaluation.

   The Main Panel buttons (and some others) have been replaced
   with a different button type, using significantly less of
   Windows' resources (especially important for Win 3.1 users).

   General cleanup of the help file.

   New update and upgrade policy: all free for the lifetime of
   the program, without version limit.

VERSION 1.40 - 96/11/05

   A major new feature: computer math operations, including
   conversions between binary, octal, hex and decimal, also
   8, 16 and 32-bit word lengths.

   The Linear Algebra and Polynomial Root panels are now called
   from the new Extras menu (their buttons are no longer in the
   Bottom Line).

   For users whose email programs have problems handling file
   attachements: Kalkulator will now create a registration key
   file when you enter your key code obtained in email (in mail,
   by phone, etc.)

   The missing exponent in the Boltzmann constant has been added.

VERSION 1.31 - 96/08/29

   A bug fix: no more locking when a data buffer is sorted while
   scrolled down (16-bit version only).

   The default directory for statistical and linear algebra files
   is now always set to the Kalkulator home directory, which could
   not be the case if the program was executed from a third-party
   shell (registered copies only).

   New topics in the HOWTO.TXT file.

VERSION 1.30 - 96/07/15

   Problem with saving multiple .kal files has been fixed.

VERSION 1.29 - 96/06/23

   There is now an option to keep Kalkulator window on top in the
   Mini Layout mode.

   The Escape key no longer closes the graph panel; use Enter.

   A check has been added against too narrow plot limits.

   A bug occuring in data point insert operation in the XY mode
   has been fixed.

VERSION 1.28 - 96/06/12

   The definition of harmonic average has been corrected.
   Small touch-ups in the program and in its Help file.

VERSION 1.27 - 96/05/29

   Fixed problem (?) with screen fonts on some systems.

   Small changes in how Data Grids handle errors in user input.

   New ordering information in the Help file: HOW TO REGISTER
   BY PHONE, FAX OR ON THE WEB USING A CREDIT CARD.

VERSION 1.25 - 96/05/14

   An autoscroll option has been added: the Expression line
   will scroll to the next expression slot upon a successful
   computation.

   A [Clear] button has been added to the Root Panel.

VERSION 1.24 - 96/04/22

   A new feature: finding real and complex roots of polynomial
   equations with real coefficients (linear, square, cubic;
   also quartic in the registered version).

   Pressing the F1 key will now bring context-sensitive help in
   most of the dialog boxes.

VERSION 1.23 - 96/03/31

   A bug, introduced in V1.21 has been fixed: Kalkulator no
   longer refuses to do sums and derivatives.

VERSION 1.21 - 96/03/18

   32-bit: first release for Windows/95
   16-bit: brought in sync with the 32-bit version

VERSION 1.20 - 96/03/12

   A major new feature: linear algebra operations (matrix and
   vector algebra, matrix inversion, systems of simultaneous
   linear equations).

   The editor for data buffer has been redesigned: now it uses
   a data grid.

   The maximum length of an expression has been increased to
   72 operands/operators or 120 characters (registered copies).

   The reciprocal function has been renamed from inv to rcp.

   A bug fix: no more lockups when the user attempts to perform
   column-wise data buffer computation if arithmetic errors
   occur at some of the points.

VERSION 1.10 - 96/02/12

   A maintenance release (despite round version number). Fixed bug
   causing non-rounded display of some values describing plots in
   log scale.

VERSION 1.09 - 96/01/14

   Sound effects added.

   Important ONLY for some European users: a "." is now used as
   the decimal point, regardless of regional settings.

VERSION 1.07 - 95/12/14

   Expressions, not just values, are accepted wherever numerical
   input is expected. A "Mini Layout" option introduced. Physical
   constants added.

VERSION 1.04 - 95/11/25

   Workaround around a compiler bug, affecting user functions.

VERSION 1.00 - 95/11/11

   The original release.
