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
) _' g' Z- T" k; X7 _请达人帮我指出错误好改进/ C) |& j, [" ]) b
( B# M; [# T* g, fto find-distance
7 m+ d5 A3 @; y let i 05 Y& y4 t) t0 Z& p' X8 S8 R) q* ~5 p
let nodedistance 0
( f% {' U9 Y/ D let linknumber 04 c1 [* l* |) C. G( K* W# s
while [i < count turtles]
; ^9 r) H- X4 ^1 l' r, B9 V2 l [
2 }+ [) |8 M+ M& ~9 K if link-neighbor? turtle i" B- f' z/ P7 ^
[set nodedistance (nodedistance + sum ([link-length] of turtle i))
& n' B2 N5 G# W1 W( \ set linknumber (linknumber + count [link-neighbors] of turtle i)]
' H' L9 p2 f; E/ n! N if linknumber != 0$ O- E: s2 \1 ~( r0 q, b
[ Q- \$ H w* s, Y3 m+ E0 @! W
set average-node-distance (nodedistance / linknumber)( T# G: y0 A7 M9 A( x+ O
]0 G* o! C, {) _, ?+ z
set i i + 1: r7 T. Q5 L, y* n
]: n/ c. \- b$ K) `* b8 p
end
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& x& z X; i4 u! l$ U d; v[ 本帖最后由 qy987 于 2008-11-12 02:18 编辑 ] |