174 Appendix B: General Information
NO SIGN CHNG •The solve( function or the equation solver did
not detect a sign change.
• You attempted to compute æ when FV,
(Ú…PMT), and PV are all ‚0, or when FV,
(Ú…PMT), and PV are all _0.
• You attempted to compute irr( when neither
CFList nor CFO is •0, or when neither CFList nor CFO is •0.
NONREAL ANS In Real mode, the result of a calculation yielded a
complex result. This error is not returned during
graphing. The TI-84 Plus allows for undefined values
on a graph.
OVERFLOW You attempted to enter, or you have calculated, a
number that is beyond the range of the graphing
handheld. This error is not returned during
graphing. The TI-84 Plus allows for undefined values
on a graph.
RESERVED You attempted to use a system variable
inappropriately. See Appendix A.
SINGULAR MAT • A singular matrix (determinant = 0) is not valid
as the argument for L1.
•The
SinReg instruction or a polynomial
regression generated a singular matrix
(determinant= 0) because it could not find a
solution, or a solution does not exist.
This error is not returned during graphing. The TI-84
Plus allows for undefined values on a graph.
SINGULARITY expression in the solve( function or the equation
solver contains a singularity (apoint at which the
function is not defined). Examine a graph of the
function. If the equation has a solution, change the
bounds or the initial guess or both.
Error Type Possible Causes and Suggested Remedies