user manual

20090601
2-8-43
Using the Action Menu
u
solve
Function: Returns the solution of an equation or inequality.
Syntax: solve(Exp/Eq/Ineq [,variable] [
) ]
• For this syntax, “Ineq” also includes the
⫽
operator.
• “
x
” is the default when you omit “[,variable]”.
solve(Exp/Eq,variable[, value, lower limit, upper limit] [
) ]
• This syntax does not support “Ineq”, but the
⫽
operator is supported.
• “value” is an initially estimated value.
• This command is valid only for equations and
⫽
expressions when “value”
and the items following it are included. In that case, this command returns
an approximate value.
• A true value is returned when you omit “value” and the items following it.
When, however, a true value cannot be obtained, an approximate value is
returned for equations only based on the assumption that value = 0, lower
limit = –
∞
, and upper limit =
∞
.
solve({Exp-1/Eq-1, ..., Exp-N/Eq-N}, {variable-1, ..., variable-N} [
) ]
• When “Exp” is the first argument, the equation Exp = 0 is presumed.
Example: To solve
ax
+
b
= 0 for
x
Menu Item: [Action][Equation/Inequality][solve]
Example: To solve simultaneous linear equations 3
x
+ 4
y
= 5, 2
x
– 3
y
= –8
Menu Item: [Action][Equation/Inequality][solve]
You also could input the simultaneous equations shown in this example using the 2D
keyboard
key. The following shows the required input syntax.
Exp-1/Eq-1
Exp-N/Eq-N variable-1, ..., variable-N
• The following shows the required key operation to input this example using the
key.
d
≈
+
e
Y
=
f
c
c
≈
-
d
Y
=
-
i
e
≈
,
Y
w
• To input simultaneous equations with three or more unknowns, press the key when
the cursor is in the Exp-N/Eq-N input field. Each press of will add one more line for
input of an equation.