Texas Instruments TI-84 - Manual (Page 631)

Appendix B: Reference Information 628
Except for system variables, you can store any string of characters, functions, instructions,
or variables to the functions
Yn , ( 1 through 9 , and 0 ), XnT / YnT ( 1 through 6 ), rn ( 1 through
6 ), u(n) , v(n) , and w(n) directly or through the Y= editor. The validity of the string is
determined when the function is evaluated.
Archive Variables Archive Variables Archive Variables Archive Variables
You can store data, programs or any variable from RAM to user data archive memory
where they cannot be edited or deleted inadvertantly. Archiving also allows you to free up
RAM for variables that may require additional memory. The names of archived variables
are preceded by an asterisk
“*”
indicating they are in user data archive.
System Variables System Variables System Variables System Variables
The variables below must be real numbers. You may store to them. Since the TI-84 Plus
can update some of them, as the result of a
ZOOM , for example, you may want to avoid
using these variables to store nongraphing data.
• Xmin , Xmax , Xscl , @ X , XFact , Tstep , PlotStart , nMin , and other window variables.
• ZXmin , ZXmax , ZXscl , ZTstep , ZPlotStart , Zu(nMin) , and other ZOOM variables.
The variables below are reserved for use by the TI-84 Plus. You cannot store to them.
n , v, Sx , s x , minX , maxX , Gy , G y
2
, G xy , a , b , c , RegEQ , x1 , x2 , y1 , z , t , F , c
2
,
Ç, v
1 , Sx1 , n1 ,
lower , upper , r
2
, R
2
and other statistical variables.