Hp 39g+ Manuel d'utilisateur télécharger pdf (Page 154)

11-10 Using mathematical functions

RECURSE Provides a method of defining a sequence without using

the Symbolic view of the Sequence aplet. If used with |

(“where”), RECURSE will step through the evaluation.

RECURSE(sequencename, term

, term

)

Example

RECURSE(U,U(N-1)*N,1,2)

U1(N)

Stores a factorial-calculating function named U1.

When you enter U1(5), for example, the function

calculates 5! (120).

Σ Summation. Finds the sum of expression with respect to

variable from initialvalue to finalvalue.

Σ(variable=initialvalue, finalvalue, expression)

Example

Σ(C=1,5,C

) returns 55.

Matrix functions

These functions are for matrix data stored in matrix

variables. See “Matrix functions and commands” on

page 13-9.

Polynomial functions

Polynomials are products of constants (coefficients) and

variables raised to powers (terms).

POLYCOEF Polynomial coefficients. Returns the coefficients of the

polynomial with the specified roots.

POLYCOEF ([roots])

Example

To find the polynomial with roots 2, –3, 4, –5:

POLYCOEF([2,-3,4,-5]) returns[1,2,-25,

-26,120], representing x

+2x

–25x

–26x+120.

1 2 ... 149 150 151 152 153 154 155 156 157 158 159 ... 293 294

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Hp 39g+ Manuel d'utilisateur Page 154