Value
of
the
function
Root
Using
SOLVE
To
solve
ffor
an
unknown
variable:
1. Enter a program that defines the function. (See 'Writing Pro
grams for
SOLVE,*
below.)
2.
Select
the program that defines the function to
solve:
press
Ml
solve//I
{FN}
label.
3.
Solve for
the
unknown
variable: press
Hi
solve//
I
{SOLVE}
variable.
You
can halt a running calculation by pressing[c] or
IR/SI.
Initial
Guesses.
For certain functions it helps to provide one or two
initial
guesses
(in the
variable
and the
X-register)
for the unknown
variable beforestarting the calculation (step3).This can speed up the
calculation, direct the answer toward a realistic solution,
and
find
more than one solution, if appropriate. See 'Choosing Initial Guesses
for SOLVE'
on
page 120.
Results. The
X-register
and the
variable
itself
containthe
final
esti
mate of the root, the Y-register contains the previous estimate, and
the
Z-register
contains
the
value
ofthe
function
at thelast
estimate
of
the
root (which
should
be
zero).
For
some complicated mathematical conditions, a definitive solution
cannot be found. See 'Interpreting
Results*
and 'When
SOLVE
Can
not Find a Root* in appendix C.
7:
Solving
ffor
an
Unknown
Variable
in
an
Equation
111
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