HP 50G, Руководство пользователя

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Page 27-9
For example, the following three equations define initial velocity and
acceleration based on two observed distances and times. The first two
equations alone are mathematically sufficient for solving the problem, but each
equation contains two unknown variables. Adding the third equation allows a
successful solution because it contains only one of the unknown variables.
To create more robust equations, you can include functions that ensure proper
and faster calculations—for example, CONST and TDELTA, UBASE, EXP, and
IFTE.
If your equations use any of the following functions, their variables won’t
necessarily be detected by the Multiple-Equation Solver:
Σ
,
∫
,
∂
, |, QUOTE,
APPLY, TVROOT, and CONST.
The list of equations in EQ may contain menu definitions, but those definitions
are ignored by MINIT when it creates Mpar . However, you can reorder the
menu labels using MITM (described below).
To create a set of equations for the Multiple-Equation Solver
1. Enter each equation in the set onto the stack.
2. Press
—
to begin the Interactive Stack and then move the cursor up to the
level containing the first equation you entered.
3. Press to combine them into a list.
4. Press
³ ~ e ~ q K
to store the list into the EQ variable.
5. Press
G—`
EQLIB EQLIB $MES# !MINIT!
to create Mpar and prepare the
equation set for use with the Multiple-Equation Solver.
1
0 1
a x v
t
= + ⋅
2
0 2
a x v
t
= + ⋅
1
2 1
2
) ) (
(
x
a
x t
t
= ⋅
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