BESSELK(x, n)

Returns the modified Bessel function represented by K(x).

xThe value at which to evaluate the function.
nThe order of the function.

Remarks

* If any of the arguments are not numeric, then #VALUE! is returned.
* If "x" < 0, then #NUM! is returned.
* If "n" is not an integer, it is truncated.
* If "n" < 0, then #NUM! is returned.
* In Excel 2007 the accuracy of this function was improved.
* In Excel 2003 this function was only available when you had the Analysis ToolPak add-in loaded.
* For the Microsoft documentation refer to support.office.com

 A
1=BESSELK(1,1) = 0.602
2=BESSELK(1,2) = 1.625
3=BESSELK(2,1) = 0.140
4=BESSELK(2,2) = 0.254
5=BESSELK(1.5,1) = 0.277
6=BESSELK(1.5,1.9) = 0.277
7=BESSELK(-1.5,1) = #NUM!
8=BESSELK(1.5,-1) = #NUM!
9=BESSELK("some text",1) = #VALUE!
10=BESSELK(1.5,"some text") = #VALUE!


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