Returns the natural logarithm of a complex number.
| Name | Type | Description |
| arg1 | any | Is a complex number for which you want the natural logarithm. |
builder.CreateFile("xlsx");
var oWorksheet = Api.GetActiveSheet();
var oFunction = Api.GetWorksheetFunction();
oWorksheet.GetRange("A1").SetValue(oFunction.IMLN("-2+2.5i"));
builder.SaveFile("xlsx", "IMLN.xlsx");
builder.CloseFile();