The Diffe Sub-Menu; The Poly Sub-Menu - HP 50g User Manual

Using units with the SOLVR sub-menu
These are some rules on the use of units with the SOLVR sub-menu:
Entering a guess with units for a given variable, will introduce the use
of those units in the solution.
If a new guess is given without units, the units previously saved for that
particular variable are used.
To remove units enter a number without units in a list as the new guess,
i.e., use the format { number }.
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.
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
2
+ a x + a x + a
2 1
, a , a , a ]. For example, the roots of the polynomial whose coefficients are
2 1 0
[1, -5, 6] are [2, 3].
Function PCOEF
, the vector of coefficients should be entered as [a
0
n n-1
x + a x + ...
n n-1
, a , ...
n n-1
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