Round-Off Error and Underflow
The limited (12-digit) precision of the calculator
can cause Mround-off' errors that adversely affect iterative solutions.
has no roots because the left side of the equation is always positive.
returns the answer 2.0000 for initial guesses of 1
and 2, due to round-off.
Round-off can also cause
to fail to find a root. The equation:
ABS(X2 - 7)
has a root at
However, no 12-digit number
the function never equals O. Furthermore, the function never changes
returns the message
HO ROOT FHD.
Underflow can also affect
results. For example, con-
sider the equation:
whose root is infinite in value. Because of underflow,
very large value as a root.
B: More About Solving Equations