| CFML Reference |
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ColdFusion Functions |
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| CFML Reference |
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ColdFusion Functions |
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Returns the natural logarithm of a number. Natural logarithms are based on the constant e (2.71828182845904).
Log(number)
| Parameter |
Description |
|---|---|
| number |
Positive real number for which you want the natural logarithm |
<!--- This example shows how to use Log --->
<html>
<head>
<title>Log Example</title>
</head>
<body bgcolor = silver>
<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>You must enter a positive real number to
see the natural logarithm of that number<cfelse><BR>The natural logarithm
of #FORM.number#: #log(FORM.number)#</cfif>
<cfif FORM.number LTE 0><BR>You must enter a positive real number to
see the logarithm of that number to base 10<cfelse><BR>The logarithm of
#FORM.number# to base 10: #log10(FORM.number)#</cfif>
</cfoutput>
</cfif>
<cfform action = "log.cfm" method = "POST">
Enter a number to see its value raised to the E power,
the natural logarithm of that number, 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>
</body>
</html>
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