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升级 91% TA的每日心情 | 难过 2012-8-27 18:22 |
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签到天数: 1 天 [LV.1]初来乍到
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Forcal优化库FcOpt中新增函数fcopt::solve,试图求解方程的全部解。正在测试修改,请大家多提意见。8 `2 P- `/ q% Z+ Y- f# F
参考:http://www.forcal.net/sysm/forcal9/fchtm/fcopt.htm
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例子1:解方程组:
1 k/ B7 r8 J% I/ e- (x-y)^2-3*(x-y) = 10' [7 b( G. \4 _$ _( H6 p7 o8 A
- x^2+2*x*y+y^2 = 9
复制代码
) _! V- q% X5 y: y" [! B代码:& r. e5 Z% G& ~7 _/ v" `
- f(x,y,y1,y2)=
% v$ y* V5 c0 g# N+ z% g - {1 y4 P; T$ T6 T
- y1=(x-y)^2-3*(x-y)-10,! B7 y/ \$ x* b4 X* M
- y2=x^2+2*x*y+y^2-9- ]+ v8 T( m( I9 W
- };
5 O I1 h4 Z% h' y v; J; X# i3 S - fcopt::solve[HFor("f")];
复制代码
( M6 I, ~& {/ N& u* s结果:
, `; E6 j; W, [% p" S" f: L0.5 2.5 0.
: C* d# ~' X! z' n; n4 `1 R1 q-2.5 -0.5 0.$ N8 x* E& R. A v
1.000000000225044 -4.00000000022569 2.231017652693784e-009+ C H6 n) U# b" u/ f
4.000000000395746 -1.00000000039106 3.894538219597456e-009
$ `. _: v2 g1 N4.
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4 w/ v" {3 d0 k. L2 B例子2:解方程组:
. Z0 C8 P2 v- n' J- 2*x1-x2^2-exp(-x1) = 0
; z9 e/ O9 O ] - -(x1^3)+x1*x2-exp(-x2) = 0
复制代码
9 U6 V, Q! c& k! t @" M& s代码:6 Y b! v3 s* @# \
- f(x1,x2,y1,y2)=1 T0 _3 L3 D t- D9 C6 m9 z) \
- {
; f# s3 v* P% b2 G) E4 y - y1=2*x1-x2^2-exp(-x1),
7 F1 d9 O! A# \$ _+ k - y2=-(x1^3)+x1*x2-exp(-x2)
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- fcopt::solve[HFor("f")];
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结果:
! E. s/ a: Y2 H/ S Y$ G0.7914550065632104 1.062885264188035 0.; V% y) e, E7 J% s& {% f( O* N
0.9977869653328695 1.275491849454102 3.925231146709438e-0178 H( c# h6 y0 {, `/ q
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; d; F1 F8 O$ }2 Q! F1 X例子3:解方程组:t取-7~7
+ \0 ]% O; k( h, J& n4 G( ]6 v- -b*sin(a+6*t)+n-40.4945=0+ d* {: M2 v& i9 `2 K; `2 H
- -b*sin(a+7*t)+n-40.5696=0' ? F/ n( U) G6 W( L: L
- -b*sin(a+8*t)+n-41.0443=0$ d% v5 |) d5 {$ M$ N: Q5 q
- -b*sin(a+9*t)+n-41.4190=0
复制代码 1 ~& N. G7 c( h4 }" q
代码:& Y: y8 s- d# R' L- B2 y* n) h
- !using["fcopt"];$ f* X1 \# g4 O
- f(a,b,n,t,y1,y2,y3,y4)=
- 4 w3 a$ I( G2 Q& v* ?$ ?, {8 Y
- {+ a ]: C j2 h
- y1=-b*sin(a+6*t)+n-40.4945, Z E, `& o( J- F5 D\\" u; I
- y2=-b*sin(a+7*t)+n-40.5696,
- # i* m( U+ E8 O# v: s
- y3=-b*sin(a+8*t)+n-41.0443,; [, e9 q. w/ {* y
- y4=-b*sin(a+9*t)+n-41.4190
- ) u, L5 S\\" P; Y
- };' q$ _2 n( B/ d4 }: G8 K
- solve[HFor("f"), optrange,-1e50,1e50,-1e50,1e50,-1e50,1e50,-7,7];
4 m$ B6 M# K$ ^, a* C. F一种可能的结果(该方程组有无穷解):. l/ o, c$ B8 x) l9 j
-2.140093203561007 -0.4915300827061839 40.94928398718974 1.077226214994063 3.552713678800501e-0153 d( a5 Y' ]9 k z& |4 A0 `
-11.56487116433041 0.491530082706186 40.94928398718974 1.077226214994066 5.024295867788081e-015
/ J2 v( H/ ]( e/ H/ H8 A-8.423278510740103 -0.4915300827061995 40.94928398718977 1.077226214993991 8.702335715267317e-015/ q$ A6 q, U) q
2555.116326818533 -0.4915300827062283 40.94928398718988 1.07722621499373 4.819135301037582e-014. V, m8 q+ ^; v! Z4 w2 O
1.001499450023601 0.4915300827059401 40.94928398718962 -5.205959092184797 1.64387405750109e-013. w4 C( x9 E) d% x6 x
-17.84805647151125 0.4915300827056817 40.9492839871897 1.077226214994272 3.642354617502926e-013
: f/ D0 G/ L. w0 f. A/ k t& }3 D3146.874339449554 -0.4915300825865869 40.94928398712157 -1.077226215397079 1.198690006101687e-010, m/ F$ N3 g. e0 r
4.14309210834897 -0.4915300817987574 40.94928398665894 -5.205959092793353 8.618584276014861e-010: Y2 S! r% x7 Z2 r* `9 D
5628.732535974947 -0.491530080064976 40.9492839770687 -1.077226245248003 7.394104227928194e-009
# l1 j6 I! Z" B* Q3 s7 D* L1934.219575147075 -0.4915300766540718 40.94928398081019 -1.077226212465366 8.617217026839414e-009# s! _6 P5 Z- h) \0 Y# h
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