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楼主 |
发表于 2017-7-19 22:05:01
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" I5 T9 ^- b9 FK = DSolve[{-V/(x*f''[x])*Sqrt[1 + f'[x]^2] == 2*V, f[-L] == 0,
" ^4 _* ` V g4 S( \ f'[-L] == 0}, {f[x]}, x];
/ X. ?3 D$ o4 `1 Q! d5 JM = K /. {V -> 1, L -> 100};
( @9 {, V5 A1 _4 g# bManipulate[$ k' |7 t, W6 q6 i/ W! g
Plot[M[[2, 1, 2]], {x, -100, 0}, & _" R* s+ D1 v k7 T
Epilog -> {PointSize[0.01], Black,
" Q i( m& {; g( X) p. T- T Point[{{a, M[[2, 1, 2]] /. x -> a}, {0,
3 k' R' l9 g/ k5 _8 n# a8 h, _ M[[2, 1, 2]] - x*D[M[[2, 1, 2]], x] /. x -> a}}], Red, Dashed,
( s4 d) s5 Y. _) H1 Y, S- { s Line[{{a, M[[2, 1, 2]] /. x -> a}, {0,
r% q# C0 [) H2 H4 ^$ [. o1 b M[[2, 1, 2]] - x*D[M[[2, 1, 2]], x] /. x -> a}}]}], {a, -100, $ A+ c0 O8 N/ r+ [
0}]( M8 t& D' S+ Y0 p$ E
Export["1.gif", 3 |6 H' v* B* P; }% c% q: ?
Table[Plot[M[[2, 1, 2]], {x, -100, 0}, 0 b2 U* w1 E+ `% }5 e
Epilog -> {PointSize[0.01], Black, * a' j/ E( V6 R0 m- D& ~
Point[{{a, M[[2, 1, 2]] /. x -> a}, {0, 4 R5 ]1 i8 B6 e" g
M[[2, 1, 2]] - x*D[M[[2, 1, 2]], x] /. x -> a}}], Red, Dashed,# v' y W0 S! G, o$ N
Line[{{a, M[[2, 1, 2]] /. x -> a}, {0, ' w2 q; t* a+ L7 m5 U2 }7 b2 S
M[[2, 1, 2]] - x*D[M[[2, 1, 2]], x] /. x -> a}}]}], {a, 9 {& s9 a& Z6 l8 n
Join[Range[-100, -1], {-0.0001}]}]]
4 Q7 F' r0 ~7 Q7 A8 |) {' c; ^4 D: Y, A; v3 Z+ k* B
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