# The BESSELI function

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(known as Bessel's differential equation) for an arbitrary complex number a, the order of the Bessel function. Although a Y −α produce the same differential equation for real a, It is conventional to set different Bessel functions for these two values ​​in such a way that the Bessel functions are mostly smooth functions of a.

This is not intended to be a math lecture. I'll be out of my depth very quickly. Essentially, Excel has four modified Bessel functions, that specialists can use when needed. BESSELI returns the modified Bessel function that is identical to the Bessel function evaluated for purely imaginary arguments.

The BESSELI The function uses the following syntax:

The BESSELI The function has the following arguments:

• X: required. This is the value at which to examine the function
• North: additionally required. This represents the order of the Bessel function. And North it is not a whole number, is truncated accordingly.

It should be noted at the same time that:

• And X it is not numeric, BESSELI return the #VALUE! error value
• And North it is not numeric, BESSELI return the #VALUE! error value
• And North <0, BESSELI return the #ON ONE! error value
• The Northth modified order Bessel function of variable X it is:
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