/sys$common/syshlp/helplib.hlb FORTRAN, Intrinsic Procedures, LOG10  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  LOG10 (number)

  A function that returns the common log (base 10) of the argument.
  The argument must be greater than zero.
  +------+---------+----------+------------+-------------+
  | Args | Generic | Specific |  Argument  | Result Type |
  +------+---------+----------+------------+-------------+
  |  1   |  LOG10  | ALOG10   | REAL*4     | REAL*4      |
  |      |         | DLOG10   | REAL*8     | REAL*8      |
  |      |         | QLOG10   | REAL*16    | REAL*16     |
  +------+---------+----------+------------+-------------+
  The argument for ALOG10, DLOG10, and QLOG10 must be greater than
  zero.