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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。
! c( _2 T4 d; E5 O( N( W参考:http://www.forcal.net/sysm/forcal9/fchtm/fcopt.htm% S# X" Y8 _) }
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例子1:解方程组:) U/ O" R0 k; f. u0 U
- (x-y)^2-3*(x-y) = 10
5 S* e8 b p9 C0 F! }; b- X - x^2+2*x*y+y^2 = 9
复制代码 3 b4 T9 M2 ~8 m" |
代码:! p/ B# M5 N2 R
- f(x,y,y1,y2)=; M- `\" Q' x2 n/ v
- {1 ` v( ]& ^/ G3 [( \& Y4 ~
- y1=(x-y)^2-3*(x-y)-10,2 S! m( m, R/ W& r. b/ ~ g' H6 w2 C8 f
- y2=x^2+2*x*y+y^2-9
\" G7 t- i4 N# W - };
5 y, z9 n+ ^% u, C - fcopt::solve[HFor("f")];
复制代码 . }& G: t+ g$ Y( w: w
结果:
$ }( S/ Z; H% H: |' C3 M1 Y$ n0.5 2.5 0.
7 K) u3 ~. t& _: J& t0 D! f6 w7 d" c-2.5 -0.5 0.
6 A. G2 U# Y" A4 a; \% [7 a1.000000000225044 -4.00000000022569 2.231017652693784e-0092 G; }2 v0 H4 B2 R. c
4.000000000395746 -1.00000000039106 3.894538219597456e-009& r$ @* ]. b& Z7 M
4.
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例子2:解方程组:5 h3 W9 ~, G! ~7 [2 Q$ U
- 2*x1-x2^2-exp(-x1) = 03 S5 I, ]+ ~3 j$ D+ l( d H6 v
- -(x1^3)+x1*x2-exp(-x2) = 0
复制代码
0 V3 s& d: G/ `$ `4 Z0 l代码:
1 Q& _& b& V) N5 O( W) j: C. W4 X3 C& C- f(x1,x2,y1,y2)=
$ T- A' M- z& C8 ^\" f - {4 Z, N5 M- x' K
- y1=2*x1-x2^2-exp(-x1),4 n* Z6 S' H. ] R( ?% [
- y2=-(x1^3)+x1*x2-exp(-x2)
, f% f8 a( N) _$ E\" M7 X! ?- } - };8 t6 u9 T' o9 ^! C! K% H5 e2 P D
- fcopt::solve[HFor("f")];
复制代码
+ ?1 l7 I! Y) ]. R; B结果:
3 {# i0 v6 s5 r7 V) A( Q0.7914550065632104 1.062885264188035 0. \9 Z0 r" R( l
0.9977869653328695 1.275491849454102 3.925231146709438e-0170 |4 P" E! M0 l- L9 Q
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( v) k& f9 B5 b$ x- z4 [7 R
例子3:解方程组:t取-7~7$ Q$ Y2 h4 @( ~& S! v* M
- -b*sin(a+6*t)+n-40.4945=01 Y$ D( W7 S9 [2 j( e( k
- -b*sin(a+7*t)+n-40.5696=0
' i& [! P8 v, ?. M5 a8 e - -b*sin(a+8*t)+n-41.0443=05 ^- r; _, m$ Z6 k2 q* N
- -b*sin(a+9*t)+n-41.4190=0
复制代码
) F1 l$ a: g% @$ }# Q4 B$ k代码:4 K( I7 ?2 c/ F
- !using["fcopt"];
- 4 F4 `: i# v) f0 K: D% A
- f(a,b,n,t,y1,y2,y3,y4)=
- 1 m- @\\" z. y' V; ]+ m
- {! b- X( C( B% r' s$ w
- y1=-b*sin(a+6*t)+n-40.4945,0 ^4 f; p1 t y+ k# Q4 Z% Q5 f) O
- y2=-b*sin(a+7*t)+n-40.5696,* j3 ?$ Z/ B' a. X: G: F
- y3=-b*sin(a+8*t)+n-41.0443,
- + j' t, E+ C5 o& p4 e
- y4=-b*sin(a+9*t)+n-41.4190# B\\" l\\" k3 A, c\\" e* y( a* F
- };
- 9 c. \1 T* \6 N. [/ I; x
- solve[HFor("f"), optrange,-1e50,1e50,-1e50,1e50,-1e50,1e50,-7,7];
- n0 d3 Q2 P7 f% Y. F; ^* v一种可能的结果(该方程组有无穷解):
2 G; r# k* z$ g2 J-2.140093203561007 -0.4915300827061839 40.94928398718974 1.077226214994063 3.552713678800501e-0155 @) X0 \. z" f* A+ z) G
-11.56487116433041 0.491530082706186 40.94928398718974 1.077226214994066 5.024295867788081e-015* c9 g' y$ l: R
-8.423278510740103 -0.4915300827061995 40.94928398718977 1.077226214993991 8.702335715267317e-015, o8 M% t! P3 g) q; q. P
2555.116326818533 -0.4915300827062283 40.94928398718988 1.07722621499373 4.819135301037582e-014' Z2 g/ o; |6 L! n
1.001499450023601 0.4915300827059401 40.94928398718962 -5.205959092184797 1.64387405750109e-013- o7 W6 a9 J; S. Q# ?
-17.84805647151125 0.4915300827056817 40.9492839871897 1.077226214994272 3.642354617502926e-013: U. ]7 D0 z- G8 k9 s8 \# k( v
3146.874339449554 -0.4915300825865869 40.94928398712157 -1.077226215397079 1.198690006101687e-010
0 f- k, N) \' a5 ?& I9 D) K2 T- s4.14309210834897 -0.4915300817987574 40.94928398665894 -5.205959092793353 8.618584276014861e-010+ z1 L0 T; b. n! H4 @
5628.732535974947 -0.491530080064976 40.9492839770687 -1.077226245248003 7.394104227928194e-009& N+ w. @( B6 t+ S s5 i
1934.219575147075 -0.4915300766540718 40.94928398081019 -1.077226212465366 8.617217026839414e-0094 ~1 k& C; M7 Q% e! e$ I
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