HP HP-15C - Logarithmic Functions

28 Section 2: Numeric Functions
Logarithmic Functions
Natural Logarithm. Pressing |Z calculates the natural logarithm of
the number in the display; that is, the logarithm to the base e.
Natural Antilogarithm. Pressing ' calculates the natural antilogarithm
of the number in the display; that is, raises e to the power of that number.
Common Logarithm. Pressing | o calculates the common
logarithm of the number in the display; that is, the logarithm to the base 10.
Common Antilogarithm. Pressing @ calculates the common
antilogarithm of the number in the display; that is, raises 10 to the power of
that number.
Keystrokes
Display
45 |Z
3.8067
Natural log of 45.
3.4012 '
30.0001
Natural antilog of 3.4012.
12.4578 | o
1.0954
Common log of 12.4578.
3.1354 @
1,365.8405
Common antilog of
3.1354.
Hyperbolic Functions
Given x in the display (X-register):
Pressing
Calculates
´P[
hyperbolic sine of x
|H[
inverse hyperbolic sine of x
´P\
hyperbolic cosine of x
|H\
inverse hyperbolic cosine of x
´P]
hyperbolic tangent of x
|H]
inverse hyperbolic tangent of x