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28#
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發(fā)表于 2017-7-19 22:05:01
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K = DSolve[{-V/(x*f''[x])*Sqrt[1 + f'[x]^2] == 2*V, f[-L] == 0,
1 ~8 X+ S* \3 f% b f'[-L] == 0}, {f[x]}, x];% Q" |. g2 k5 {3 O
M = K /. {V -> 1, L -> 100};3 i E9 D8 C' M# l
Manipulate[" y8 K" \+ x4 y- E" s" S
Plot[M[[2, 1, 2]], {x, -100, 0},
4 L. x8 r* K$ w3 Y! Y2 A6 ]; H0 \; [ Epilog -> {PointSize[0.01], Black, * d# Y+ ?; W3 K0 L/ g6 g4 Q+ s
Point[{{a, M[[2, 1, 2]] /. x -> a}, {0,
! ]4 U0 z" T) r5 v M[[2, 1, 2]] - x*D[M[[2, 1, 2]], x] /. x -> a}}], Red, Dashed,
( E! v+ s" r+ i& Q/ d Line[{{a, M[[2, 1, 2]] /. x -> a}, {0, ; q0 \1 X `+ t: x3 [
M[[2, 1, 2]] - x*D[M[[2, 1, 2]], x] /. x -> a}}]}], {a, -100, 7 f# {" I) d! M, J' H
0}]8 A& }& f- \( A, s& W1 b% D% s9 S
Export["1.gif", 8 H% E$ X7 [* K
Table[Plot[M[[2, 1, 2]], {x, -100, 0},
0 E) d6 b$ q% j- P5 G5 i Epilog -> {PointSize[0.01], Black, 6 P" D+ l4 [- Y w( w$ @8 b/ E8 s7 R
Point[{{a, M[[2, 1, 2]] /. x -> a}, {0,
. z6 L( i" g& a. R2 e: e M[[2, 1, 2]] - x*D[M[[2, 1, 2]], x] /. x -> a}}], Red, Dashed,+ ?1 G- e1 [, S- c! b l/ f
Line[{{a, M[[2, 1, 2]] /. x -> a}, {0, + p9 h9 G( ^& t) u( \; Z* S: E+ B% ]' C6 U
M[[2, 1, 2]] - x*D[M[[2, 1, 2]], x] /. x -> a}}]}], {a, % _! h: H' D1 V; b1 G! U
Join[Range[-100, -1], {-0.0001}]}]]
; x' y0 x I$ `/ D- f0 B& _2 {
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