accelerating convergence

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8/20/2019 Accelerating Convergence http://slidepdf.com/reader/full/accelerating-convergence 1/6 AITKEN'S METHOD g(x) = e^-x p0 = 0 n pn (fxed point) 0 2.0000000 1 0.6931472 2 1.4381024 3 1.2149020 4 1.3187955 5 1.2752438 6 1.2944524 7 1.2861550 8 1.2897725 9 1.2882016 10 1.2888850 11 1.2885879 12 1.2887171 13 1.2886610 14 1.2886854 15 1.2886748 16 1.2886794 17 1.2886774 18 1.2886782 19 1.2886779 20 1.2886780 21 1.2886779 22 1.2886780 23 1.2886780

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Page 1: Accelerating Convergence

8/20/2019 Accelerating Convergence

http://slidepdf.com/reader/full/accelerating-convergence 1/6

AITKEN'S METHODg(x) = e^-xp0 = 0

n pn (fxed point)0 2.00000001 0.69314722 1.43810243 1.21490204 1.31879555 1.27524386 1.29445247 1.28615508 1.28977259 1.2882016

10 1.288885011 1.288587912 1.288717113 1.288661014 1.288685415 1.288674816 1.288679417 1.288677418 1.288678219 1.288677920 1.288678021 1.288677922 1.288678023 1.2886780

Page 2: Accelerating Convergence

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(Accelerating fxed p int iterati n!)

en lambda (bisection)- -

1.3068528 -0.7449552 0.57003760.2232004 0.29961580.1038934 0.46547170.0435517 0.41919580.0192086 0.44105210.0082973 0.43195900.0036175 0.43598170.0015709 0.43424640.0006833 0.43500340.0002970 0.43467470.0001292 0.43481770.0000562 0.43475560.0000244 0.43478260.0000106 0.43477080.0000046 0.43477600.0000020 0.43477370.0000009 0.43477470.0000004 0.43477430.0000002 0.43477450.0000001 0.43477440.0000000 0.43477440.0000000 0.4347744

2.30039370.4347086

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pn_ba (ait!en's) lambda (ait!en's) pn(fxed point "o ste#ens- - 2.000000000000- - 0.6931472

1.1676296 - 1.43810241.2663591 - 1.33612431.2857962 0.1968732 1.26720001.2881079 0.1189296 1.28931581.2885733 0.2013431 1.28840051.2886580 0.1818593 1.28867811.2886742 0.1917654 1.28867791.2886773 0.1877711 1.28867801.2886778 0.1895625 1.28867801.2886779 0.1887943 1.28867801.2886780 0.1891303 1.28867801.2886780 0.1889846 1.28867801.2886780 0.1890479 1.28867801.2886780 0.1890205 1.28867801.2886780 0.1890320 1.28867801.2886780 0.1890240 1.28867801.2886780 0.1890361 1.28867801.2886780 0.1890042 1.28867801.2886780 0.1897628 1.28867801.2886780 0.1842105 1.28867801.2886780 0.0000000 1.28867801.2886780 "#$%&0' 1.2886780

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pn_ba (ste#enson's)

1.1676296

1.2872092

1.2886777

1.2886780

1.2886780

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"#$%&0'

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Page 5: Accelerating Convergence

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n a ! l te e01 """2 """3 """4 """5 """6 """7 """8 """9 """

10 """11 """12 """13 """14 """15 """16 """17 """18 """19 """20 """21 """22 """23 """24 """25 """

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a!*+pt tic c n!tant n a ! l te e a!*+pt tic c n!tant err r01

0.570038 20.299616 30.465472 4 0.0194370.419196 5 0.002312 0.118930.441052 6 0.000465 0.2013430.431959 7 8.46,-005 0.1818590.435982 8 1.62,-005 0.1917650.434246 9 3.05,-006 0.1877710.435003 10 5.78,-007 0.1895620.434675 11 1.09,-007 0.1887940.434818 12 2.06,-008 0.189130.434756 13 3.90,-009 0.1889850.434783 14 7.37,-010 0.1890480.434771 15 1.39,-010 0.1890210.434776 16 2.63,-011 0.1890320.434774 17 4.98,-012 0.1890240.434775 18 9.41,-013 0.1890360.434774 19 1.78,-013 0.1890040.434774 20 3.38,-014 0.1897630.434774 21 6.22,-015 0.1842110.434774 22 1.33,-015 0.2142860.434774 23 2.22,-016 0.166667

95092775 24 1.288678 5.8, 0150 25 0 0