# Weber's Equation And Hermite Polynomials, - HP F2226A - 48GII Graphic Calculator User Manual

Graphing calculator.

is the m-th coefficient of the binomial expansion (x+y)
number of combinations of n elements taken m at a time. This function is
available in the calculator as function COMB in the MTH/PROB menu (see
also Chapter 17).
You can define the following function to calculate Laguerre's polynomials:
When done typing it in the equation writer press use function DEFINE to
create the function L(x,n) into variable @@@L@@@ .
To generate the first four Laguerre polynomials use, L(x,0), L(x,1), L(x,2), L(x,3).
The results are:
Weber's equation and Hermite polynomials
Weber's equation is defined as d
2, ... A particular solution of this equation is given by the function , y(x) =
2
*
exp(-x
/4)H
(x/√2), where the function H
*
=
, 1
H
H
0
In the calculator, the function HERMITE, available through the menu
ARITHMETIC/POLYNOMIAL. Function HERMITE takes as argument an integer
number, n, and returns the Hermite polynomial of n-th degree. For example,
the first four Hermite polynomials are obtained by using:
L
(x) = .
0
L
(x) = 1-x.
1
2
L
(x) = 1-2x+ 0.5x
2
2
L
(x) = 1-3x+1.5x
-0.16666...x
3
2
2
y/dx
+(n+1/2-x
*
(x) is the Hermite polynomial:
n
d
2
n
x
( *
)
=
(
) 1
x
e
n
n
dx
n
. It also represents the
3
.
2
/4)y = 0, for n = 0, 1,
2
x
(
),
=
1
2 ,
,..
e
n
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