## 9.3.89 LOG (X)

Description: | Returns the natural logarithm of the argument.
Class: | Elemental function; Generic
Arguments: | X must be of type real or complex. If X is real, its value must be greater than zero. If X is complex, its value must not be zero.
Results: | The result type is the same as X. The result value is approximately equal to logeX.
| If the arguments are complex, the result is the principal value of imaginary part omega in the range -pi < omega <= pi. The imaginary part of the result is pi if the real part of the argument is less than zero and the imaginary part of the argument is zero.

Specific Name | Argument Type | Result Type
--- | --- | ---
ALOG 1 | REAL(4) | REAL(4)
DLOG | REAL(8) | REAL(8)
QLOG | REAL(16) | REAL(16)
CLOG 1 | COMPLEX(4) | COMPLEX(4)
CDLOG 2 | COMPLEX(8) | COMPLEX(8)
CQLOG | COMPLEX(16) | COMPLEX(16)
1 The setting of compiler options specifying real size can affect ALOG and CLOG. 2 This function can also be specified as ZLOG.

Examples

LOG (8.0) has the value 2.079442.

LOG (25.0) has the value 3.218876.

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