Returns the natural logarithm of the argument. If the argument is real and 0 or negative an error will result. If the argument is complex it will return a complex result even if the imaginary part is 0 and the real part negative. An error will always occur if both real and imaginary parts are zero.
| Number | Type | Compulsory | Default | Description |
| 1 | real/complex array | Yes | vector |
Return type: real/complex array
Returns the natural logarithm of the argument.
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