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Engineering function
BESSELK
Returns the modified Bessel function Kn(x).
Rarely usedDifficulty 1600 · ExpertUsage rank #513 of 520
When to use it
The modified Bessel function of the second kind, Kn(x).
The shape of it
- Syntax
=BESSELK(x, n)
Worked examples
Order one
=BESSELK(1.5,1) → 0.277387804
Order 1 at 1.5.
Order zero
=BESSELK(1,0) → 0.421024438
Order 0 at 1.
Larger x
=BESSELK(2,0) → 0.113893873
Decays quickly.
Worth knowing
- Infinite at x = 0; x must be positive.
- Decays exponentially.
- Order is truncated to an integer.
Where it goes wrong
- #NUM! for x of 0 or less, or a negative order.
- #VALUE! for non-numeric input.
Related
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