Natural log


Keyboard and display: LN


Takes the log of the value in the Xregister to base e (2.718...).


Natural antilog


Keyboard execution: ex
Display execution: E X


Raises e (2.718...) to the power of the value in the Xregister. Press
1 g
ex to display value of e.


Common log


Keyboard and display: LOG


Computes the log of the value in the Xregister to base 10.


Common antilog


Keyboard execution: 10x
Display execution: 10 X


Raises 10 to the power of the value in the Xregister.


Natural log
(for arguments close
to one)


Display execution: LN1+X


Computes ln (1 + X), where X is a number very close to zero.
LN1+X provides greater precision than
LN when you are finding that the natural log
of numbers close to one. Example: To find the natural log of
(1 + 4.25 × 10^{–6}, key in 4.25 ×
10^{–6} and execute LN1+X .
Answers are displayed in SCI format.


Natural antilog
(for arguments close
to zero)


Display execution: E X–1


Computes (e^{x}) – 1, where X is a number very close to zero.
E X–1 provides greater precision than
ex for numbers very close to zero.
Example: To calculate
(e^{4:25 × 10–6}) – 1, key in
4.25 × 10^{–6} and execute
E X–1 .
Answers are displayed in SCI format.
