                  Software Updates to Twiddle since August 1992

Added: the function "power(f(x),a,b)" which evaluates (f(x)^(1/b))^a for a and b integers (8/92)
Added: ability to construct "realistic" data (1/93).
Added: documentation of data files (1/93).
Added: mean of difference quotients (1/93).
Changed: filenames do not accept : as part of the name (5/93).
Changed: fixed problem when changing the number of data points (5/93).
Released: V 1.38 (5/93)
Changed: fixed problem with least squares calculation for large numbers (5/93).
Changed: fixed problem with screen refresh printing to printer on data graphics screen (6/93).
Added: menu item, UPDATES, with ability to read these updates (6/93).
Added: menu item, ARIZONA SOFTWARE, with ability to see a list of available UA software (6/93).
Added: when plotting data, the ability to join points (6/93).
Released: V 1.39 (6/93)
Changed: now remembers manipulated functions.
Released: V 1.40 (7/93)
Added: five new functions (8/93)
       sind(x), cosd(x), tand(x) (sin(x), cos(x), tan(x) with x in degrees).
       loga(x,a) which is log(x) to the base a.
       period(x,a,b) makes x periodic in [a,b) if a < b or in (b,a] if a > b.
Added: help on functions when creating functions, and INSERT key is pressed.
Changed:  Graphs are now printed using CTRL F10 (9/93)
Added: when plotting functions and data, the ability to do a least squares fit and to join data (9/93).
Released: V 1.41 (9/93)
Changed: lowered graphics box so function definition could be more easily seen when plotting.
Released: V1.42 (5/94)
Added: when plotting data, the ability to do a least squares fit to a straight line through the origin (7/96).
Added: menu item, EVALUATE, with ability to evaluate function at a specific point (7/96).
Added: menu item, COMPARE FUNCTION AND DATA, with ability to compare the function value to the data (7/96).
Removed: menu item, CONSTURCT REALISTIC TABLE to make room for previous three items (7/96).
Released: V1.43 (8/96)
Added: more comparisons under COMPARE FUNCTION AND DATA.
Released: V1.44 (9/96)



