HP 39GS hp 39gs_user's guide_English_E_HDPMG39AE13.pdf - Page 163
Matrix functions, Polynomial functions, POLYCOEF, POLYEVAL, POLYFORM
UPC - 808736931328
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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,C2) returns 55. Matrix functions These functions are for matrix data stored in matrix variables. See "Matrix functions and commands" on page 15-10. 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 x4+2x3-25x2-26x+120. POLYEVAL Polynomial evaluation. Evaluates a polynomial with the specified coefficients for the value of x. POLYEVAL([coefficients], value) Example For x4+2x3-25x2-26x+120: POLYEVAL([1,2,-25,-26,120],8) returns 3432. POLYFORM 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. Using mathematical functions 13-11