tailieunhanh - Burden - Numerical Analysis 5e (PWS, 1993) Epside 1 Part 6

Tham khảo tài liệu 'burden - numerical analysis 5e (pws, 1993) epside 1 part 6', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 116 CHAPTER 3 Interpolation and Polynomial Approximation This formula is called the Newton forward divided-difference formula. Another I form called the Newton forward-difference formula is constructed by making use of I the forward difference notation A introduced in Aitken s A2 method. With this notation . 1 _ 1 A . I 0 ---------- Í A W I XỊ - x0 h vl 1 AfOo 1 A2 . 1 x0 xb x2 7p A x0 4 2h _ n J 2n j and in general J 1 I Xo . . . xj AẢ x0 . 4 c d T T Consequently Eq. becomes the following formula. Newton Forward-Difference Formula Ệ n J PM ẳ u MfW ị A----0 K If the interpolating nodes are reordered as xn . . . x0 a formula similar to J Eq. results ỉị Pn x f xn-ỵ x x - x -1 n - n O H-1 p f x0. - J - n-l - 1 . Using equal spacing with X x sh andx Xj s 7Ĩ i h produces 7 F x p x sh . M shfix Xni s s l h2f xn X i_ x s s 1 j n V hnf Xfr Xỵ . x . . This form is called the Newton backward divided-difference formula. It is used to Ệ derive a more commonly applied formula known as the Newton backward-difference 7 formula. To discuss this formula we need the following definition. 7 Definition Given the sequence pn n o define the backward difference by Pn-Pn - Pn ỉ forn 1. A Higher powers are defined recursively by I pn V VÀ -1p for k 2. n B K -Ệ Definition implies that I AW x f xn-2 xn_ỵ xn T72V2f x JJ rt 2n T. Divided Differences ĨĨ7 er of Ì 1 -Ỉ 1 to to ice EXAMPLE 2 Table and in general f xn_k . . x 77TtVy x . k h Consequently M v2 x -r 5 5 1 s n 1 3 r-------------- w. nl Extending the binomial coefficient notation to include all real values of 5 we let i - A _ - -S ft 1 _ k s s- -if-fsrk - 1 k k k and p x W w -D -ộvyCQ -1 vyw to obtain the following formula. Newton Backward-Difference Wrmnla 3-14 J2 P w 2 1 7 vw Consider the table of data given in Example 1. The divided-difference table corresponding to these data is shown in Table . First Second divided divided differences differences Third Fourth divided divided differences differences

TỪ KHÓA LIÊN QUAN
crossorigin="anonymous">
Đã phát hiện trình chặn quảng cáo AdBlock
Trang web này phụ thuộc vào doanh thu từ số lần hiển thị quảng cáo để tồn tại. Vui lòng tắt trình chặn quảng cáo của bạn hoặc tạm dừng tính năng chặn quảng cáo cho trang web này.