# IMLOG10

Returns the common logarithm (base 10) 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.

2. In the Add-Ins available list, select the Analysis ToolPak box, and then click OK.
3. If necessary, follow the instructions in the setup program.

Syntax

IMLOG10(inumber)

Inumber     is a complex number for which you want the common logarithm.

Remarks

• Use COMPLEX to convert real and imaginary coefficients into a complex number.
• The common logarithm of a complex number can be calculated from the natural logarithm as follows:

Example

The example may be easier to understand if you copy it to a blank worksheet.

1. Create a blank workbook or worksheet.
2. Select the example in the Help topic.

Note   Do not select the row or column headers.

Selecting an example from Help
1. Press CTRL+C.
2. In the worksheet, select cell A1, and press CTRL+V.
3. To switch between viewing the results and viewing the formulas that return the results, press CTRL+` (grave accent), or on the Formulas tab, in the Formula Auditing group, click the Show Formulas button.
A B
Formula Description (Result)
=IMLOG10("3+4i") Logarithm (base 10) of 3+4i (0.69897 + 0.402719i)

Applies to:
Excel 2003