我写的这个计算语句,调试时通过,但是运行时出现了不知名的错误
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to find-distance9 O. N5 U n1 t' f
let i 0, O6 t9 |- [; I; v+ |( u& [% x. Y
let nodedistance 0
[+ ~0 [5 i- U: M# x+ g+ J3 ], I7 [ let linknumber 0
. w" @! g# i- s0 y& t while [i < count turtles]4 ~- ?/ [# F+ I$ y% b& ]( m
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if link-neighbor? turtle i
0 @5 J0 d% k3 q7 q& [ [set nodedistance (nodedistance + sum ([link-length] of turtle i))
4 Q( a" ` `8 Z set linknumber (linknumber + count [link-neighbors] of turtle i)], k- O4 f5 C' M2 y3 c2 a
if linknumber != 0- \, e! h( c @' z; P. D; V
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set average-node-distance (nodedistance / linknumber)
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! m! h: d$ I4 f6 b$ v, _& J set i i + 1
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end0 {9 O: o4 P3 y0 _& _
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[ 本帖最后由 qy987 于 2008-11-12 02:18 编辑 ] |