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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。2 E: F6 u# s. [( v1 L, c& D1 \ A' j
参考:http://www.forcal.net/sysm/forcal9/fchtm/fcopt.htm c; o/ W4 u! s) m2 Z
! E2 a, l2 B6 t例子1:解方程组:
/ l2 s# k. H2 u0 `- (x-y)^2-3*(x-y) = 10* `! p/ s* Y\" o& P; @9 q
- x^2+2*x*y+y^2 = 9
复制代码
& r8 ?3 o$ Y0 C: K5 ^代码:* ?/ H( E# e$ l' e- o
- f(x,y,y1,y2)=
\" W/ U, W3 P. Y( H- Q5 E# J - {
& c- b! g$ \2 {- ?' L8 c - y1=(x-y)^2-3*(x-y)-10,! s% E& a H. F
- y2=x^2+2*x*y+y^2-91 ~( ?( ]4 U; Z$ M. ?) o
- };
, C2 a. v9 q8 S7 X - fcopt::solve[HFor("f")];
复制代码
r1 G5 g% B2 ~6 i0 [* Y结果:1 \& k6 U- Q9 J; w' P/ b/ N
0.5 2.5 0.; ]6 ~, K+ P6 T, q$ A( m+ J
-2.5 -0.5 0.
- k) ~, w$ [8 v) {( n9 P- n! w1.000000000225044 -4.00000000022569 2.231017652693784e-009 v" l3 c1 }* l: u1 G
4.000000000395746 -1.00000000039106 3.894538219597456e-0090 W1 R4 ~- q( _% O* u. s g
4.
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例子2:解方程组:
1 W/ k, I) B$ L- Y% \: O- 2*x1-x2^2-exp(-x1) = 0
9 b; S; X! a* {$ p - -(x1^3)+x1*x2-exp(-x2) = 0
复制代码 ! o7 A2 B* b0 o* @+ A
代码:
& L P O: I; v( |- f(x1,x2,y1,y2)=
7 T3 F7 }& Q [' ^+ q& d - {; U3 V% W. W. ~, M5 f
- y1=2*x1-x2^2-exp(-x1),* P7 ~- ?2 a/ c* P: }, o
- y2=-(x1^3)+x1*x2-exp(-x2)/ t6 q. ?& i' r1 x9 K
- };
; d4 c1 Y/ K, s - fcopt::solve[HFor("f")];
复制代码 ; E. Y! f ~1 h9 t- _
结果:
, M5 ]. V! I9 I, X) @. n; Z0.7914550065632104 1.062885264188035 0.
2 R' e2 F5 Y& e) i0.9977869653328695 1.275491849454102 3.925231146709438e-017. o% h2 {: a! o3 |/ X
2.
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例子3:解方程组:t取-7~7
8 M8 M4 i0 I: T- -b*sin(a+6*t)+n-40.4945=0
4 ?& c+ @+ m6 m* e! [0 j1 a4 n - -b*sin(a+7*t)+n-40.5696=0) c# X; b8 q- l4 _9 a/ r
- -b*sin(a+8*t)+n-41.0443=04 f7 ~+ @1 P# N+ f
- -b*sin(a+9*t)+n-41.4190=0
复制代码 2 Z- ?. g$ d% u% x; T, \, r
代码:
$ U; @/ M! e! p+ A( s7 h1 i- !using["fcopt"];, r- D8 v# w5 [1 s1 \; F
- f(a,b,n,t,y1,y2,y3,y4)=3 Q8 \- J. @ N
- {
- & y1 R; ~( j* y* |, `9 T0 T
- y1=-b*sin(a+6*t)+n-40.4945,' m: i# r: l; b1 d\\" Z% r
- y2=-b*sin(a+7*t)+n-40.5696,* s8 y4 m! E/ b$ {1 c1 T
- y3=-b*sin(a+8*t)+n-41.0443,
- 3 X# k7 c7 W: Q* v, r1 O* o
- y4=-b*sin(a+9*t)+n-41.4190* o6 m# [9 K* [! f8 D
- };
- ( B' v% L& }9 [
- solve[HFor("f"), optrange,-1e50,1e50,-1e50,1e50,-1e50,1e50,-7,7];
1 o6 N ^% \2 z( o% o8 D
一种可能的结果(该方程组有无穷解):
* e" F* V: W$ j7 p3 O8 G' ]* Z-2.140093203561007 -0.4915300827061839 40.94928398718974 1.077226214994063 3.552713678800501e-015: ]* N6 l5 U3 _7 O A
-11.56487116433041 0.491530082706186 40.94928398718974 1.077226214994066 5.024295867788081e-015
5 r- s# R7 T/ A- v6 n0 ?-8.423278510740103 -0.4915300827061995 40.94928398718977 1.077226214993991 8.702335715267317e-0153 y+ R6 I4 X3 i6 ~4 Y' S- ^+ P% n
2555.116326818533 -0.4915300827062283 40.94928398718988 1.07722621499373 4.819135301037582e-014
3 Z+ j8 a* N) Z0 L% M1.001499450023601 0.4915300827059401 40.94928398718962 -5.205959092184797 1.64387405750109e-013
1 I( a* I+ G) k! j* {+ u: U* ]-17.84805647151125 0.4915300827056817 40.9492839871897 1.077226214994272 3.642354617502926e-0131 |$ K; Z& G- B" V( [. e- R
3146.874339449554 -0.4915300825865869 40.94928398712157 -1.077226215397079 1.198690006101687e-010$ h$ W5 Y9 B2 m( f% C* @- I
4.14309210834897 -0.4915300817987574 40.94928398665894 -5.205959092793353 8.618584276014861e-010
" i: F/ p8 a8 f6 J/ n4 A9 o) _, g5628.732535974947 -0.491530080064976 40.9492839770687 -1.077226245248003 7.394104227928194e-009
8 z9 L% v, ~% p1934.219575147075 -0.4915300766540718 40.94928398081019 -1.077226212465366 8.617217026839414e-009
# U4 ?" v4 p ]3 u0 G4 b10.3 p6 g* h$ J- ^0 e9 Z
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