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Related Function:  IMEXP Function

Basic Description

The Excel Imln function returns the natural logarithm of a supplied complex number.

The format of the function is:

where the inumber argument is a complex number.

Note that complex numbers are simply stored as text in Excel. When a text string in the format "a+bi" or "a+bj" is supplied to one of Excel's built-in complex number functions, this is interpreted as a complex number.

Also the complex number functions can accept a simple numeric value, as this is equivalent to a complex number whose imaginary coefficient is equal to 0.

Therefore, the inumber argument can be supplied to the Excel Imln function as either:

	-	A simple number
or
	-	A complex number encased in quotation marks - eg. "5+3i"
or
	-	A reference to a cell containing a complex number or a numeric value
or
	-	A value returned from another Excel function or formula

These are all included in the examples below.

Imln Function Examples

The spreadsheet below shows 4 different examples of the Imln function.

The format of the functions are shown in the spreadsheet on the left and the resulting values are shown in the spreadsheet on the right.

Note that, in cell B1 of the above spreadsheet, the supplied inumber argument is the integer 2, which is equal to the complex number 2+0i.

Further information and examples of the Excel Imln function can be found on the Microsoft Office website

Trouble Shooting

If you get an error from the Excel Imln Function, this is likely to be one of the following: