HP 50G, Руководство пользователя

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Page 6-29
Using units with the SOLVR sub-menu
These are some rules on the use of units with the SOLVR sub-menu:
Θ
Entering a guess with units for a given variable, will introduce the use
of those units in the solution.
Θ
If a new guess is given without units, the units previously saved for that
particular variable are used.
Θ
To remove units enter a number without units in a list as the new guess,
i.e., use the format { number }.
Θ
A list of numbers can be given as a guess for a variable. In this case,
the units takes the units used belong to the last number in the list. For
example, entering { 1.41_ft 1_cm 1_m } indicates that meters (m) will
be used for that variable.
Θ
The expression used in the solution must have consistent units, or an
error will result when trying to solve for a value.
The DIFFE sub-menu
The DIFFE sub-menu provides a number of functions for the numerical solution of
differential equations. The functions provided are the following:
These functions are presented in detail in Chapter 16.
The POLY sub-menu
The POLY sub-menu performs operations on polynomials. The functions
included are the following:
Function PROOT
This function is used to find the roots of a polynomial given a vector containing
the polynomial coefficients in decreasing order of the powers of the
independent variable. In other words, if the polynomial is a
n
x
n
+ a
n-1
x
n-1
+ …
+ a
2
x
2
+ a
1
x + a
0
, the vector of coefficients should be entered as [a
n
, a
n-1
, …
, a
2
, a
1
, a
0
]. For example, the roots of the polynomial whose coefficients are
[1, -5, 6] are [2, 3].
Function PCOEF