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-1 1 "Courier" 1 12 0 0 0 1 2 1 2 2 2 2 0 0 0 1 } {CSTYLE "Help Underlined" -1 44 "Times" 1 12 0 0 0 1 2 2 1 2 2 2 0 0 0 1 }{CSTYLE "Help Underlined Italic" -1 43 "Times" 1 12 0 0 0 1 1 2 1 2 2 2 0 0 0 1 }{CSTYLE "2D Math Bold" -1 5 "Times" 1 12 0 0 0 1 2 1 2 2 2 2 0 0 0 1 }{CSTYLE "2D Math Italic" -1 3 "Times" 1 12 0 0 0 1 1 2 2 2 2 2 0 0 0 1 }} {SECT 0 {EXCHG {PARA 202 "" 0 "" {TEXT 210 64 "Worksheet to execute t he examples in Kaltofen, May, Yang, & Zhi:" }{TEXT 210 1 "\n" }{TEXT 210 1 "\n" }{TEXT 210 1 "'" }{TEXT 210 63 "Approximate Factorization o f Multivariate Polynomials Using SVD" }{TEXT 210 1 "'" }}}{EXCHG {PARA 207 "> " 0 "" {MPLTEXT 1 201 25 "# Factorization routines:" } {MPLTEXT 1 201 1 "\n" }{MPLTEXT 1 201 32 "read(\"../Src/multifac_1.6.m pl\"):" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 30 "Digits:=floor(eva lhf(Digits));" }}{PARA 11 "" 1 "" {XPPMATH 20 "\"#9" }}}{EXCHG {PARA 207 "> " 0 "" {MPLTEXT 1 201 57 "# rand_path:=\"debug_exs\\/\": # for \+ debugging the worksheet" }{MPLTEXT 1 201 1 "\n" }{MPLTEXT 1 201 48 "ra nd_path:=\"examples\\/\": # examples in the paper" }}}{EXCHG {PARA 207 "> " 0 "" {MPLTEXT 1 201 23 "infolevel[multifac]:=2;" }}{PARA 11 "" 1 "" {XPPMATH 20 "\"\"#" }}}{EXCHG {PARA 207 "" 0 "" {TEXT 203 42 "A no te about backward_error(F, G, [vars]):" }{TEXT 203 1 "\n" }{TEXT 203 97 "We compute c so that ||F-c*G||_2 is as small as possible. The out put is ||F - c*G||_2 / ||F||_2." }{TEXT 203 1 "\n" }{TEXT 203 1 "\n" } {TEXT 203 48 "Example 16 has been moved to it's own worksheet." }}} {SECT 0 {PARA 209 "" 0 "" {TEXT 204 105 "Examples 10, 11 & 12: One pol ynomial (12, 7, 5) with perturbations of different orders (-5 and -1) \+ added:" }}{SECT 0 {PARA 208 "" 0 "" {TEXT 211 75 "Example 10: Three Fa ctors (12, 7, 5), Large Noise -5, very sparse noise: 5%" }}{EXCHG {PARA 207 "> " 0 "" {MPLTEXT 1 201 29 "read(cat(rand_path,\"exF10\")): " }}}{EXCHG {PARA 207 "> " 0 "" {MPLTEXT 1 201 42 "F10 := expand(evalf (cleanF10 + noiseF10)):" }}}{EXCHG {PARA 207 "> " 0 "" {MPLTEXT 1 201 38 "norm(evalf(noiseF10),2) / norm(F10,2);" }{MPLTEXT 1 201 1 "\n" } {MPLTEXT 1 201 15 "ceil(log10(%));" }}{PARA 11 "" 1 "" {XPPMATH 20 "$ \"/x1b_******!#>" }}{PARA 11 "" 1 "" {XPPMATH 20 "!\"&" }}}{EXCHG {PARA 207 "> " 0 "" {MPLTEXT 1 201 12 "t10:=time():" }{MPLTEXT 1 201 1 "\n" }{MPLTEXT 1 201 26 "facF10:=appfac(F10,[x,y]):" }{MPLTEXT 1 201 1 "\n" }{MPLTEXT 1 201 16 "t10:=time()-t10;" }}{PARA 6 "" 1 "" {TEXT 212 116 "` the biggest gap, the last r-th singular values and th e number of factors `, 658.37353903434, .85582090298382e-6, 3" }} {PARA 6 "" 1 "" {TEXT 212 61 "` The time for computing the number of f actors*****`, 130.406" }}{PARA 6 "" 1 "" {TEXT 212 55 "`The time for t he entire factorization******`, 1728.374" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%$t10G$\"(@%G " 0 "" {MPLTEXT 1 201 13 "nops(facF10);" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#\"\"$" }}} {EXCHG {PARA 207 "> " 0 "" {MPLTEXT 1 201 62 "berror10:=backward_error (F10, convert(facF10, `*`), [x,y])[2];" }{MPLTEXT 1 201 1 "\n" } {MPLTEXT 1 201 15 "ceil(log10(%));" }}{PARA 11 "" 1 "" {XPPMATH 20 "6# /%\"cG$!/_AX?A*e%!#6" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%)berror10G$ \"/1m;s&=;$!#<" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#!\"$" }}}{EXCHG {PARA 207 "> " 0 "" {MPLTEXT 1 201 59 "save facF10, t10, berror10, cat (rand_path,\"exF10-factors\");" }}}}{SECT 0 {PARA 208 "" 0 "" {TEXT 211 52 "Example 11: Three Factors (12, 7, 5), Large Noise -5" }} {EXCHG {PARA 207 "> " 0 "" {MPLTEXT 1 201 29 "read(cat(rand_path,\"exF 11\")):" }}}{EXCHG {PARA 207 "> " 0 "" {MPLTEXT 1 201 42 "F11 := expan d(evalf(cleanF11 + noiseF11)):" }}}{EXCHG {PARA 207 "> " 0 "" {MPLTEXT 1 201 38 "norm(evalf(noiseF11),2) / norm(F11,2);" }{MPLTEXT 1 201 1 " \n" }{MPLTEXT 1 201 15 "ceil(log10(%));" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#$\"/#=qkf=-\"!#=" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#!\"%" }}} {EXCHG {PARA 207 "> " 0 "" {MPLTEXT 1 201 12 "t11:=time():" }{MPLTEXT 1 201 1 "\n" }{MPLTEXT 1 201 26 "facF11:=appfac(F11,[x,y]):" }{MPLTEXT 1 201 1 "\n" }{MPLTEXT 1 201 16 "t11:=time()-t11;" }}{PARA 6 "" 1 "" {TEXT 212 116 "` the biggest gap, the last r-th singular values and th e number of factors `, 833.53638482292, .67589817442882e-6, 3" }} {PARA 6 "" 1 "" {TEXT 212 61 "` The time for computing the number of f actors*****`, 137.405" }}{PARA 6 "" 1 "" {TEXT 212 55 "`The time for t he entire factorization******`, 2642.453" }}{PARA 6 "" 1 "" {TEXT 212 116 "` the biggest gap, the last r-th singular values and the number o f factors `, 1635.1608734688, .40453322177311e-5, 2" }}{PARA 6 "" 1 "" {TEXT 212 59 "` The time for computing the number of factors*****`, 4 .843" }}{PARA 6 "" 1 "" {TEXT 212 53 "`The time for the entire factori zation******`, 36.984" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%$t11G$\"(iN o#!\"$" }}}{EXCHG {PARA 207 "> " 0 "" {MPLTEXT 1 201 13 "nops(facF11); " }}{PARA 11 "" 1 "" {XPPMATH 20 "6#\"\"$" }}}{EXCHG {PARA 207 "> " 0 "" {MPLTEXT 1 201 62 "berror11:=backward_error(F11, convert(facF11, `* `), [x,y])[2];" }{MPLTEXT 1 201 1 "\n" }{MPLTEXT 1 201 15 "ceil(log10( %));" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#/%\"cG$!/(RD9(oF5!#5" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%)berror11G$\"/-i%[Hxx(!#=" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#!\"%" }}}{EXCHG {PARA 207 "> " 0 "" {MPLTEXT 1 201 59 "save facF11, t11, berror11, cat(rand_path,\"exF11-factors\");" }}} }{SECT 0 {PARA 208 "" 0 "" {TEXT 211 53 "Example 12: Three Factors (12 , 7, 5), Larger Noise -3" }}{EXCHG {PARA 207 "> " 0 "" {MPLTEXT 1 201 15 "#read(\"exF12\"):" }}}{EXCHG {PARA 207 "> " 0 "" {MPLTEXT 1 201 48 "F12 := expand(evalf(cleanF11 + 10.^2*noiseF11)):" }}}{EXCHG {PARA 207 "> " 0 "" {MPLTEXT 1 201 45 "norm(evalf(10.^2.*noiseF11),2) / norm (F12,2);" }{MPLTEXT 1 201 1 "\n" }{MPLTEXT 1 201 15 "ceil(log10(%));" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#$\"/o;3_#=-\"!#;" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#!\"#" }}}{EXCHG {PARA 207 "> " 0 "" {MPLTEXT 1 201 12 "t12:=time():" }{MPLTEXT 1 201 1 "\n" }{MPLTEXT 1 201 26 "facF12:=appf ac(F12,[x,y]):" }{MPLTEXT 1 201 1 "\n" }{MPLTEXT 1 201 16 "t12:=time() -t12;" }}{PARA 6 "" 1 "" {TEXT 212 116 "` the biggest gap, the last r- th singular values and the number of factors `, 8.3401444211470, .6756 1577360017e-4, 3" }}{PARA 6 "" 1 "" {TEXT 212 61 "` The time for compu ting the number of factors*****`, 139.062" }}{PARA 6 "" 1 "" {TEXT 212 55 "`The time for the entire factorization******`, 4159.290" }} {PARA 6 "" 1 "" {TEXT 212 116 "` the biggest gap, the last r-th singul ar values and the number of factors `, 20.456213644050, .3245889213548 3e-3, 2" }}{PARA 6 "" 1 "" {TEXT 212 59 "` The time for computing the \+ number of factors*****`, 4.984" }}{PARA 6 "" 1 "" {TEXT 212 53 "`The t ime for the entire factorization******`, 41.594" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%$t12G$\"(4]?%!\"$" }}}{EXCHG {PARA 207 "> " 0 "" {MPLTEXT 1 201 13 "nops(facF12);" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#\" \"$" }}}{EXCHG {PARA 207 "> " 0 "" {MPLTEXT 1 201 62 "berror12:=backwa rd_error(F12, convert(facF12, `*`), [x,y])[2];" }{MPLTEXT 1 201 1 "\n" }{MPLTEXT 1 201 15 "ceil(log10(%));" }}{PARA 11 "" 1 "" {XPPMATH 20 " 6#/%\"cG$!/eE0b\"o&=!#5" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%)berror12 G$\"/Q+zD.Be!#;" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#!\"#" }}}{EXCHG {PARA 207 "> " 0 "" {MPLTEXT 1 201 59 "save facF12, t12, berror12, cat (rand_path,\"exF12-factors\");" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 0 "" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 0 "" }}}{EXCHG {PARA 207 "" 0 "" {TEXT 213 0 "" }}}}}{PARA 204 "" 0 "" {TEXT 214 0 "" }}} {MARK "0 0 0" 0 }{VIEWOPTS 1 1 0 1 1 1803 1 1 1 1 }{PAGENUMBERS 0 1 2 33 1 1 }