Formulas and Functions

Chapter 5 Engineering Functions 75
Related Topics
For related functions and additional information, see:
“BESSELY” on page 75
“Listing of Engineering Functions” on page 72
“Value Types” on page 36
“The Elements of Formulas” on page 15
“Using the Keyboard and Mouse to Create and Edit Formulas” on page 26
“Pasting from Examples in Help” on page 41
BESSELY
The BESSELY function returns the integer Bessel function Y
n
(x).
BESSELY(pos-x-value, n-value)
 pos-x-value: The positive x value at which you want to evaluate the function.
pos-x-value is a number value and must be greater than 0.
 n-value: The order of the function. n-value is a number value and must be greater
than or equal to 0. If n-value has a decimal portion, it is ignored.
Usage Notes
This form of the Bessel function is also known as the Neumann function. Â
Examples
=BESSELY(25, 3) returns 0.117924850396893.
=BESSELY(25, 3.9) also returns 0.117924850396893, since any decimal portion of n-value is ignored.
=BESSELY(-25, 3) returns an error, since negative or zero values are not permitted.
Related Topics
For related functions and additional information, see:
“BESSELJ” on page 74
“Listing of Engineering Functions” on page 72
“Value Types” on page 36
“The Elements of Formulas” on page 15
“Using the Keyboard and Mouse to Create and Edit Formulas” on page 26
“Pasting from Examples in Help” on page 41