Texas Instruments TITANIUM TI-89 - Manual (Page 448)

Differential Equation Graphing 448
When you see this or any other error message:
• For your order of equation, use the previous table to find the valid Fields settings.
Change to the applicable setting.
• For a particular Fields setting, check the following for information that applies to that
setting.
2nd-order
(system of two 1st-order equations) DIRFLD or FLDOFF
3rd- or higher-order
(system of three or more 1st-order equations) FLDOFF
Because Fields = SLPFLD is the default
setting, a common error message is shown to
the right.
If the equation is: Valid Fields settings are: