Probability Functions - HP 40gs User Manual

POLYFORM
POLYROOT
H I N T

Probability functions

COMB
13-12
Example
4 3
For x +2x –25x
POLYEVAL([1,2,-25,-26,120],8) returns
3432.
Polynomial form. Creates a polynomial in variable1 from
expression.
POLYFORM(expression, variable1)
Example
POLYFORM((X+1)^2+1,X) returns X^2+2*X+2.
Polynomial roots. Returns the roots for the nth-order
polynomial with the specified n+1 coefficients.
POLYROOT([coefficients])
Example
4 3
For x +2x –25x
POLYROOT([1,2,-25,-26,120]) returns
[2,-3,4,-5].
The results of POLYROOT will often not be easily seen in
HOME due to the number of decimal places, especially if
they are complex numbers. It is better to store the results
of POLYROOT to a matrix.
For example, POLYROOT([1,0,0,-8]
store the three complex cube roots of 8 to matrix M1 as
a complex vector. Then you can see them easily by going
to the Matrix Catalog. and access them individually in
calculations by referring to M1(1), M1(2) etc.
Number of combinations (without regard to order) of n
things taken r at a time: n!/(r!(n-r)).
COMB(n, r)
Example
COMB(5,2) returns 10. That is, there are ten
different ways that five things can be combined two
at a time.!
2
–26x+120:
2
–26x+120:
Using mathematical functions
M1 will