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发表于 2017-7-19 22:05:01
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+ }- r* z0 ~" B+ K4 o. k* j: j' A, PK = DSolve[{-V/(x*f''[x])*Sqrt[1 + f'[x]^2] == 2*V, f[-L] == 0,
, c! \8 ]+ r" A" H: q f'[-L] == 0}, {f[x]}, x];5 M) h6 T, }. J% }
M = K /. {V -> 1, L -> 100};
# o, ]: _; w# \Manipulate[
/ x2 f0 b# i1 t/ F t Plot[M[[2, 1, 2]], {x, -100, 0},
0 {$ C' d5 T( W v! _ ?* B# i3 w Epilog -> {PointSize[0.01], Black,
- b! m7 g. D6 J, [% h Point[{{a, M[[2, 1, 2]] /. x -> a}, {0, 1 e& B' q7 Q( u2 F2 Q& Q* j
M[[2, 1, 2]] - x*D[M[[2, 1, 2]], x] /. x -> a}}], Red, Dashed, 0 p& e" h* J$ |' n' H
Line[{{a, M[[2, 1, 2]] /. x -> a}, {0,
$ K; \8 ^7 n5 D; Z M[[2, 1, 2]] - x*D[M[[2, 1, 2]], x] /. x -> a}}]}], {a, -100,
0 j+ m+ }" A' C9 e8 V3 q 0}]% O# f1 m0 X+ i/ A
Export["1.gif",
2 N9 ]6 x) n' N* ` Table[Plot[M[[2, 1, 2]], {x, -100, 0}, 5 u! L( R0 E C* N
Epilog -> {PointSize[0.01], Black,
, y4 f: [( @+ m" J+ E Point[{{a, M[[2, 1, 2]] /. x -> a}, {0, 6 W, q+ z. t, Y4 A m( l
M[[2, 1, 2]] - x*D[M[[2, 1, 2]], x] /. x -> a}}], Red, Dashed,6 N& E. R+ t- o0 a: Z) S
Line[{{a, M[[2, 1, 2]] /. x -> a}, {0, $ z/ K4 G2 f; j7 {% _1 }% S8 Y
M[[2, 1, 2]] - x*D[M[[2, 1, 2]], x] /. x -> a}}]}], {a, ! E* a6 l! P) I1 F
Join[Range[-100, -1], {-0.0001}]}]]
4 b% E4 V$ P& W& l& m5 G( u6 l: Z8 ?0 s% G. s3 p1 @% u1 M
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