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>