Texas Instruments TI-84 - Manual (Page 658)

Appendix B: Reference Information 655
VARIABLE You have tried to archive a variable that cannot be
archived or you have tried to unarchive an application
or group.
Examples of variables that cannot be archived include:
• Real numbers LRESID, R, T, X, Y , Theta , Statistic
variables under Vars , STATISTICS menu, Yvars ,
and the AppIdList .
VERSION You have attempted to receive an incompatible variable
version from another graphing calculator.
WINDOW
RANGE A problem exists with the window variables.
• You defined Xmax  Xmin or Ymax  Ymin .
• You defined
q max  q min and
q step > 0 (or vice
versa).
• You attempted to define Tstep=0 .
• You defined Tmax

Tmin and Tstep > 0 (or vice
versa).
• Window variables are too small or too large to graph
correctly. You may have attempted to zoom in or zoom
out to a point that exceeds the TI-84 Plus’s numerical
range.
ZOOM • A point or a line, instead of a box, is defined in ZBox.
• A ZOOM operation returned a math error.
Error Type Possible Causes and Suggested Remedies