IMLN(inumber)

Returns the natural logarithm of a complex number.

inumberThe complex number you want the natural logarithm of.

Remarks

* If "inumber" is not in the form x + yi or x + yj, then #NUM! is returned.
* You can use the COMPLEX function to convert real and imaginary coefficients into a complex number.
* In Excel 2007 the format returned by this function has been changed so that the imaginary part is displayed in consistent scientific notation.
* In Excel 2003 this function was only available when you had the Analysis ToolPak add-in loaded.
* For the Microsoft documentation refer to support.office.com

 A
1=IMLN("3+4i") = 1.6094379124341+0.927295218001612i
2=IMLN("3+4j") = 1.6094379124341+0.927295218001612j
3=IMLN("-3+4i") = 1.6094379124341+2.21429743558818i
4=IMLN("4i") = 1.38629436111989+1.5707963267949i
5=IMLN("4") = 1.386
6=IMLN("4")-LN(4) = 0.000
7=IMLN("some text") = #NUM!


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