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Engineering function
BESSELJ
Returns the Bessel function Jn(x).
Rarely usedDifficulty 1600 · ExpertUsage rank #512 of 520
When to use it
The Bessel function of the first kind, Jn(x).
The shape of it
- Syntax
=BESSELJ(x, n)
Worked examples
Order two
=BESSELJ(1.9,2) → 0.329925829
Order 2 at 1.9.
At zero
=BESSELJ(0,0) → 1
J0 at zero is 1.
Order zero
=BESSELJ(1,0) → 0.765197687
Order 0 at 1.
Worth knowing
- Oscillates and decays like a damped sine.
- Vibrating membranes and FM sidebands use it.
- Order is truncated to an integer.
Where it goes wrong
- #NUM! for a negative order.
- #VALUE! for non-numeric input.
Related
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