Texas Instruments TI-84 - Manual (Page 646)

Appendix B: Reference Information 643
If you are using trigonometric functions or performing polar and rectangular conversions,
the unexpected results may be caused by an angle mode setting. The Radian and
Degree angle mode settings control how the TI-84 Plus interprets angle values.
To change the angle mode settings, follow these steps:
1. Press
z to display the Mode settings.
2. Select Degree or Radian .
3. Press
Í to save the angle mode setting.
ERR:DIM MISMATCH Error ERR:DIM MISMATCH Error ERR:DIM MISMATCH Error ERR:DIM MISMATCH Error
Your TI-84 Plus displays the ERR:DIM MISMATCH error if you are trying to perform an
operation that references one or more lists or matrices whose dimensions do not match.
For example, multiplying L1*L2, where L1={1,2,3,4,5} and L2={1,2} produces an
ERR:DIM MISMATCH error because the number of elements in L1 and L2 do not match.
ERR:INVALID DIM Error ERR:INVALID DIM Error ERR:INVALID DIM Error ERR:INVALID DIM Error
The ERR:INVALID DIM error message may occur if you are trying to graph a function that
does not involve the stat plot features. The error can be corrected by turning off the stat
plots. To turn the stat plots off, press
y , and then select
4:PlotsOff .
Contrast Feature Contrast Feature Contrast Feature Contrast Feature
If the contrast setting is too dark (set to 9) or too dim (set to 0) the unit may appear as if
it is malfunctioning or turned off. To adjust the contrast, press
and release
y, and then
press and hold
} or †.