.. highlightlang:: us

.. index:: log10

.. _log10:

log10
=====

.. us.tag  log10 ENGLISH  math-base

:ref:`log10` returns the base-10 logarithm of its parameter.

.. function::  r = log10(m)

.. us.return

**Return Value**

*r* is the base-10 logarithm of *m*.

.. us.params

**Parameters**

.. uparam:: m

   *m* is a real or complex matrix.

.. us.example

**Example**

The following functions calculates the number of decimal places
for a given axis increment using the log10 function:

::

   def GetNeededDecimalPlaces(rsDelta)
   {
       if (abs(rsDelta) == 0.0) {
           l10 = 1.0;
       } else {
           l10 = log10(abs(rsDelta));
       }

       if (l10 < 0.0) {
           return int(-floor(l10));
       } else {
           return 0;
       }
   }

.. seealso::
   :ref:`overview-mathematic`,
   :ref:`log`

:sub:`id-376131`