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 log_{e}X. | ||

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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