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AJ PHP Software Source Code Math Library
Logarithm Base


float log_base ( number y, number x)

Description:

log_base returns the base(b) of the logarithm given y and x in the following equation.

log equation

Source Code:

function log_base ($x, $y)
{
  //variable and initializations
  $the_result = 0.0;
  $temp01     = 0.0;

  //take the base 10 logarithm of y and divide by x
  $temp01 = log10($y) / $x;

  //calculate the result
  $the_result = pow(10.0, $temp01);

  //return the value
  return $the_result;
}

Example:

<?
include ("ajmath.php");

$x = 2.0;
$y = 5.4;

$the_base = log_base ($x, $y);

echo "x = $x<br>";
echo "y = $y<br>";
echo "the_base = $the_base<br>";
?>


Run Example


array average solve for the average of an array
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log base solve for the base of the logarithm function

References - Books:
Max A. Sobel, Nobert Lerner. 1991. Precalculus Mathematics. Prentice Hall.
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