Presents a table of values of y1 to y4. User sets

range and # of digits and functions displayed. 





This program was designed to (roughly) emulate a TI-82's

table feature on a TI-85.  While it has flaws, it does

many things nicely.



To use the program, first store one to four functions in

y1, y2, y3, and y4, and then run the program.



The opening menu allows you to set many things:



Range:  Sets the initial value of x, "TblMin", and

	"<Delta>Tbl", the increment between x values.

	The defaults are 0 and 1, respectively.



#Fns:	Sets the number of functions you want to use

	in your table.  This is necessary because there

	is apparently no way for a program to sense

	which of y1, y2, y3, and y4 are defined on the 

	TI-85.  Select "1" to choose just y1, select

	"3" to choose y1, y2, and y3, etc.  The default

	is "1".



#digt:	Sets the number of digits to display past the decimal

	in the table; enter "-1" for float-mode.  "3" or "4"

	work well, the default is "-1", i.e. float-mode.



The first three options above return you to the main menu when

you are done with them.



quit:	Ends the program.  Use this rather than pressing "ON" to

	halt execution:  the program may have put the calculator

	in "fix" mode, and "quit" returns the calculator to "float"

	mode.



Table:	Shows the actual table, either the default or as set by

	the menu options above.  x and y1 (and y2 if two or more

	functions were selected) are presented in a table with

	six entries.  A sub-menu appears:

	

	PageD: Shows the next 6 entries in the table, i.e. larger

	x's.



	PageU: Shows the previous 6 entries in the table, i.e. smaller

	x's.



	NxtFn: If more than one function was selected in the

	#Fns option, this will show the "next column to the

	right", i.e. if y1,y2 were displayed, NxtFn will display

	y2,y3.  This wraps around to y1 when you run out of

	functions.



	PrvFn: Opposite of NxtFn, this shows the "column to the left", 

	i.e. if y3,y4 were displayed, PrvFn will display y2,y3.  This

	wraps also.



	Main:  Returns to the main menu, where settings can be changed.



Notes:  Since the font available for programming is large, not a lot

fits on the screen.  If the numbers are large (i.e. require scientific

notation), things get a bit cramped.  If the numbers have MANY digits, the

columns overlap in ugly ways.



If the user requests, say, three functions when only y1 and y2 are defined,

the program crashes.  If the user presses "QUIT" as they should, they can 

re-run the program by simply pressing "ENTER".  If the user presses "GOTO", 

they are put in edit mode and could easily wreck the program.  To help avert

this, I've put some comments in the program that the user would see at that

point, saying:  "y3 undefined!  Press EXIT".  If they do, all is well.



Please send me comments about this program and its usefulness or lack 

thereof.

  

Program written by Prof. Mark Janeba, Dept. of Math,

Willamette Univ, Salem, OR 97301  

(internet: mjaneba@willamette.edu)