Returns the natural logarithm of a number.
||An expression that resolves to a positive number.
function returns the natural logarithm of number
. The number
value must be a non-zero positive number; all other values generate an <ILLEGAL VALUE> error.
function complements the action of the EXP
function, which is sometimes referred to as the antilogarithm.
The following example uses the LN
function to calculate the natural logarithm of each of the integers 1 through 10:
FOR x=1 TO 10
PRINT "Natural log of ",x," = ",LN(x)
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