This Excel tutorial explains how to use an Engineering function in Excel. Excel BESSELI function returns the modified Bessel functions In(x).
Syntax of the BESSELI function is BESSELI(x,n). So this function has two arguments. Both of them are mandatory. x is the value at which to evaluate the function. n represents the order of the function. And n should be positive. Function will return an error if n is less than 0.
And this is how you can use the function in the Excel.
In the above example I have passed the arguments by cell addresses. However you can pass the arguments like this as well
=BESSELI(-5,1)
This table shows the In(x) for x values from -5 to 5. Order of the function is 1.
And here is the graph for above table.
Then I changed the order of the function to 2 and calculated the In(x).
This is the graph for order 2.
