Texas Instruments TI-89 Manual Book page 13

Toggles display of the residual vector b-Ax,
Show Residuals:
where x is the computed solution. The default is No.
When Show Residuals is set to , residuals are displayed in
YES
the column to the right of b on the Coefficients screen. is
|resid|
5
the magnitude of the difference between the coefficient matrix
times the computed solution and the right side. (For example,
¦x ¦x ¦x
resid =a +a ...a -b , where i=1...n.) The entry line
i i,1 1 i,2 2 i,n n i
shows the current residual element.
sets the tolerance to
Tolerance: Default
5E-14¦max(dim(Augmented matrix)) ¦rownorm(Augmented matrix).
enables the field, where you can enter a
User-Defined Tolerance
preferred tolerance level.
TI-89 / TI-92 Plus / Voyage™ 200 PLT Simultaneous Equation Solver App Page 13