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BESSELI
See Also
Returns the modified Bessel function, which is equivalent to the Bessel function evaluated for purely imaginary arguments.
If this function is not available, and returns the #NAME? error, install and load the Analysis ToolPak add-in.
How?
- On the Tools menu, click Add-Ins.
- In the Add-Ins available list, select the Analysis ToolPak box, and then click OK.
- If necessary, follow the instructions in the setup program.
Syntax
BESSELI(x,n)
X is the value at which to evaluate the function.
N is the order of the Bessel function. If n is not an integer, it is truncated.
Remarks
- If x is nonnumeric, BESSELI returns the #VALUE! error value.
- If n is nonnumeric, BESSELI returns the #VALUE! error value.
- If n < 0, BESSELI returns the #NUM! error value.
- The n-th order modified Bessel function of the variable x is:
Example
The example may be easier to understand if you copy it to a blank worksheet.
How?
- Create a blank workbook or worksheet.
- Select the example in the Help topic. Do not select the row or column headers.
Selecting an example from Help
- Press CTRL+C.
- In the worksheet, select cell A1, and press CTRL+V.
- To switch between viewing the results and viewing the formulas that return the results, press CTRL+` (grave accent), or on the Tools menu, point to Formula Auditing, and then click Formula Auditing Mode.
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| A |
B |
| Formula |
Description (Result) |
| =BESSELI(1.5, 1) |
Modified Bessel function at 1.5 with an order of 1 (0.981666) |
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