Hp 39g Graphing Calculator Manual do Utilizador descarregar pdf (Página 151)

HI NT 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 ] HffllMl will 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 Ml(l), Ml(2) etc.

Probability functions

COMB

PERM

RANDOM

Number of combinations (without regard to order) of n things

taken r at a time: n\l{i%n-r)).

COMB(«,r)

Example

COMB (5,2) returns 10. That is, there are ten different

ways that five things can be combined two at a time.

Factorial of a positive integer. For non-integers, ! = r(v + 1).

This calculates the gamma function.

valuel

Number of permutations (with regard to order) of n things

taken r at a time: riM {n-r)\.

PERM {n, r)

Example

PERM (5,2) returns 20. That is, there are 20 different

permutations of five things taken two at a time.

Random number (between zero and 1). Produced by a pseudo

random number sequence. The algorithm used in the

RANDOM function uses a “seed” number to begin its

sequence. To ensure that two calculators must produce

different results for the RANDOM function, use the

RANDSEED function to seed different starting values before

using RANDOM to produce the numbers.

RANDOM

Using mathematical functions

10-13

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Hp 39g Graphing Calculator Manual do Utilizador Página 151