HP 30b HP 20b Business Consultant and HP 30b Business Professional User's Guid - Page 27

Random number, The Math Menu, n - rounding

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Table 2-4 Shifted Function Mathematical Operations Keys :p Description Calculates sine. :q Calculates cosine. :r Calculates tangent. :k Calculates natural log. :l Calculates natural exponent to the power of x. :m Calculates square of x. :n Calculates square root. :f Executes the Random function. Returns a random number in the range 0 < x

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Mathematical Calculations
19
Random number
Press
:f
to generate a randomly distributed number between 0 and 1.
Type a number and press
:$:f
to store a new seed for random number
generation.
The Math Menu
There are additional functions available in the Math menu. To open the Math menu, press
:s
. See Figure 8 for the menu map of the Math menu.
Table 2-4
Shifted Function Mathematical Operations
Keys
Description
:p
Calculates sine.
:q
Calculates cosine.
:r
Calculates tangent.
:k
Calculates natural log.
:l
Calculates natural exponent to the power of
x
.
:m
Calculates square of
x
.
:n
Calculates square root.
:f
Executes the
Random
function. Returns a random number in the range 0 <
x
<1.
:g
Calculates factorial of
x
(where –253 <
x
<
253). The Gamma function is used to
calculate
x!
for non-integers or negative numbers.
:i
Calculates the reciprocal.
:d
In
Chain
or
Algebraic
mode, recalls the result of the last operation. In RPN mode,
returns the content of the
Last Number
variable.
:e
Rounds
x
to the number specified by the display format.