BESSELI (Number, Order) BESSELI (Number; Order)
Number
Number Number
The value at which the function is evaluated.
Order
Number Number
The order of the Bessel function, a non-negative integer. If the order has a fractional part, the fractional part is discarded.
Returns
Number Number
The modified Bessel function of the first kind.
Calculates the modified Bessel function of the first kind. This function grows exponentially as the value of the Number parameter increases.
Bessel functions are solutions of Bessel's differential equation. They arise in physical problems with circular or cylindrical symmetry, such as the vibration of a drum or heat conduction in a pipe.
Examples
BESSELI (1, 1)
BESSELI (1; 1)
Returns roughly 0.57.
BESSELI (1, { 1, 2 })
BESSELI (1; { 1; 2 })
Returns an array roughly equal to { 0.57, 0.14 }{ 0,57; 0,14 }.