Function Analysis
This section explains commands and functions that you can input after performing the operation: 
– [Func Analysis].
Logarithm(logab), Logarithm(log)
Use – [Func Analysis] > [Logarithm(log)] to input logab as log (a, b). Base 10 is the initial default setting if you do not input anything for a.
Example 1: log101000 = log 1000 = 3
- – [Func Analysis] > [Logarithm(log)] 1000
Example 2: log216 = 4
- – [Func Analysis] > [Logarithm(log)] 2
(,)16 
The 
key (or – [Func Analysis] > [Logarithm(logab)]) also can be used for input, but only while MathI/MathO or MathI/DecimalO is selected for Input/Output on the SETTINGS menu. In this case, you must input a value for the base.
Example 3: log216 = 4
- 2
16 
Natural Logarithm
Use (ln) or – [Func Analysis] > [Natural Logarithm] to input "ln".
Example: ln 90 (= loge90) = 4.49980967
- (ln)90
