For example, given the “-4i” input, the function returns “2-2.2661800709136i” as output.

In Excel, we can define the complex base-2 logarithm using the following formula.

See theIMLNfunction for a more in-depth explanation of complex logarithms.

Complex logarithm change of base formula.

IMLOG10 Function

The Excel IMLOG10 function returns the base-10 logarithm of a complex number.

The base argument defaults to 10 if not supplied.

Complex logarithm change of base formula.

Complex logarithm change of base formula.

Complex logarithm change of base formula.

Complex logarithm change of base formula.

Excel IMLN function

Excel IMLOG10 function

Excel LOG function