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Logarithmic Functions
• For the logarithmic function “log(”, you can specify base m using the
syntax “log (
m, n)”.
If you input only a single value, a base of 10 is used for the calculation.
• “ln(” is a natural logarithm function with base e.
• You can also use the key when inputting an expression with the
form of “log
m
n” while using MathI/MathO or MathI/DecimalO format. For
details, see Example 1. Note that you must input the base (base
m)
when using the
key for input.
Example 1: log
2
16 = 4
(MathI/MathO)
2 16
(LineI/LineO)
(or ) 2 (,) 16
Example 2: log16 = 1.204119983
16
A base of 10 (common logarithm) is used if no base is specified.
Example 3: ln 90 (= log
e
90) = 4.49980967, ln e = 1
90
(e)
51
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