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HISTORY.DOC
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1994-08-16
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UCALC v2.4
==========
Features added
--------------
o Graphic plotting:
- Fast plotting
- CGA, EGA, Hercules, and VGA modes
- Cartesian, Polar, and Parametric graphs
- LINE, FILL, and RECTangle commands
- Data from another file can be plotted
- Support for up to 16 supper-imposed multi-color user graphs
- Smart crosshair (moves gradually faster as you hold arrow keys)
- Adjustable screen coordinate system
- Adjustable precision for graphs
o Ucalc now supports the factorial symbol (!).
o There are other nice features that would have been added in this
version but I need to hear the suggestions from you. Talk to me.
Anyone out there using UCALC? :). Your financial support
(registration) will also be greatly appreciated.
Changes
-------
o The syntax for several commands is more flexible. For instance
LOAD"MYFILE.DEF", LOAD MYFILE.DEF, LOAD(MYFILE.DEF), are equivalent.
Also, the ".." used in SOLVE, SUM, etc.. can be replaced by " to ".
For instance SUM(x,1 to 10) is the same as SUM(x,1..10).
o The variable PI, and the functions SEC (secant), CSC (cosecant),
and COT (cotangent) are now built in.
o The function definition space has been greatly increased, so that
many more user functions can be defined. Each expression however
can use a maximum of 33 operators.
o Due to support for the factorial notation with the "!" symbol,
the "!=" symbol for "not equal" is no longer supported. "<>"
should be used instead.
o So that UCALC can start up a bit faster, UCALC.DEF has been removed.
Users can create their own UCALC.DEF file, or can modify, and rename
UCALC.DE back to UCALC.DEF.
o Several extra features are now reserved for those who register.
Bug fixes
---------
o Functions with multiple parameters can be a part of user functions
without giving an error message.
o UCALC /? no longer changes the screen color attribute.
UCALC v1.8
==========
Features added
--------------
o Support for user functions with multiple parameters.
o Support for implicit multiplication.
o UCALC.DEF can contain any command.
o Variable 'last' contains the value of the previous expression
o Commands to change or remove the "ucalc> " and "Answer: " prompts
o PRINT, SHELL, LOAD, WRITE (save), CLOSE, EXIT (quick exit),
LISTF (list user functions) commands.
Changes
-------
o FIX controls number of decimal digits rather than total digits.
o DIG command added to do what FIX used to do.
o Due to support for implicit multiplication, users should now
avoid giving a function the same name as a variable.
o All the features previously reserved only for registered users
are now available in the shareware evaluation copy.
(This, unfortunately, seems to have been a bad decision, as
the registration rate has dropped considerably).
Bug fixes
---------
o F1 and CLS no longer change color screen attributes.
o Variables with embedded numeral digits no longer confuse the parser.
o UCALC.DEF in a different directory no longer causes a problem.