Section 11,59: LOG

 LOG (number)

 A function that returns the natural log (base e) of the argument.
 +------+---------+----------+------------+-------------+        
 | Args | Generic | Specific |  Argument  | Result Type |
 +------+---------+----------+------------+-------------+
 |  1   |  LOG    | ALOG     | REAL*4     | REAL*4      |
 |      |         | DLOG     | REAL*8     | REAL*8      |
 |      |see note | QLOG     | REAL*16    | REAL*16     |
 |      |         | CLOG     | COMPLEX*8  | COMPLEX*8   |
 |      |         | CDLOG    | COMPLEX*16 | COMPLEX*16  |
 |      |         | ZLOG     | COMPLEX*16 | COMPLEX*16  |
 +------+---------+----------+------------+-------------+

 NOTE: QLOG is not available in DEC Fortran.

 The argument for ALOG and DLOG must be greater than zero.  The
 argument for CLOG and CDLOG must not be (0.,0.).