HP 40gs hp 40gs_user's guide_English_E_HDPMSG40E07A.pdf - Page 250
Reorder, Seval, Sigma
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hp40g+.book Page 68 Friday, December 9, 2005 1:03 AM Psi REORDER SEVAL SIGMA 14-68 gives: - 5-- + 1-- ⋅ π2 46 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 Reorders the input expression following the order of variables given in the second argument. Example Typing: REORDER(X2 + 2 · X · A + A2 + Z2 - X · Z, A AND X AND Z) gives: A2 + 2 ⋅ X ⋅ A + X2 - Z ⋅ X + Z2 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: sin (2 ⋅ x) + sin(2 ⋅ x) 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. Computer Algebra System (CAS)