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IMLN
See Also
Returns the natural logarithm of a complex number in x + yi or x + yj text format.
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
IMLN(inumber)
Inumber is a complex number for which you want the natural logarithm.
Remarks
- Use COMPLEX to convert real and imaginary coefficients into a complex number.
- The natural logarithm of a complex number is:
where:
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) |
| =IMLN("3+4i") |
Natural logarithm of 3+4i (1.609438 + 0.927295i) |
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