HP 40gs Instrukcja Użytkownika Pobierz pdf (Strona 250)

100

101

14-68 Computer Algebra System (CAS)

gives:

Psi Returns the value of the Digamma function at a.

The Digamma function is defined as the derivative of

ln(Γ(x)), so we have PSI(a,0) = Psi(a).

Example

Typing:

Psi(3)

and pressing

gives:

.922784335098

REORDER Reorders the input expression following the order of

variables given in the second argument.

Example

Typing:

REORDER(X

+ 2 · X · A + A

+ Z

– X · Z, A AND X

AND Z)

gives:

SEVAL SEVAL simplifies the given expression, operating on all

but the top-level operator of the expression.

Example

Typing:

SEVAL(SIN(3 · X -– X) + SIN(X + X))

gives:

SIGMA Returns the discrete antiderivative of the input function,

that is, the function G, that satisfies the relation G(x + 1)

– G(x) = f(x). It has two arguments: the first is a function

f(x) of a variable x given as the second argument.

---

–

---

⋅+

2+ XA⋅⋅ X

Z–+ XZ

+⋅

2 x⋅()sin 2 x⋅()sin+

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