Log |
Description
Calculates the natural logarithm of a number. Natural logarithms are based on the constant e (2.71828182845904).
Returns
The natural logarithm of a number.
Category
Mathematical functions
Function syntax
    Log(number)
See also
Exp, Log10
Parameters
Parameter | Description
number | Positive real number for which to calculate the natural logarithm
Example
    <h3>Log Example</h3>

    <cfif IsDefined("FORM.number")>
       <cfoutput>
          <p>Your number, #FORM.number#
          <br>#FORM.number# raised to the E power: #exp(FORM.number)#
          <cfif FORM.number LTE 0><br>Enter a positive real number to get its
    natural logarithm
             <cfelse><br>The natural logarithm    of #FORM.number#: #log(FORM.number)#
          </cfif>
          <cfif FORM.number LTE 0><br>Enter a positive real number to get its
    logarithm to base 10
             <cfelse><br>The logarithm of #FORM.number# to base 10:
    #log10(FORM.number)#
          </cfif>
       </cfoutput>
    </cfif>
    <cfform action = "log.cfm">
    Enter a number to see its value raised to the E power, its natural logarithm,
    and the logarithm of number to base 10.
    <cfinput type = "Text" name = "number" message = "You must enter a number"
    validate = "float" required = "No">
    <input type = "Submit" name = "">
    </cfform>

number |
Positive real number for which to calculate the natural logarithm