我编的程序如下turtles-own [energy]: _9 t b7 x6 {9 T2 H6 u3 b4 V$ }; r
to setup- C' Z) `8 U$ I; J! T! x+ M1 o
clear-all
D; R# h/ Y4 n& u setup-patches
) g, u- n0 m' o/ A create-turtles 1007 M; k% u& Y+ m K) k$ }2 Z+ _
do-plots
" _! v- \" X, p/ {* K3 T ask turtles [ setxy random-xcor random-ycor ]
; B! k. G2 n' J; ~. @; Z) Kend
$ X2 Z0 G4 ^; B/ Y0 h4 k% c/ B' gto go# C& \* i5 M9 O' _+ P+ e
move-turtles4 B: b) V1 y" \- U) v& ?
eat-grass) r! T- M' e# S6 [# J' ^0 x |
reproduce: K/ K' A1 U0 F# o) i" N
check-death9 e9 N. R7 \# _8 q* e" U6 Y* q* l4 y& r
regrow-grass
. C; n6 O) j' n2 q do-plots2 l% Q* j x8 r. f) {
end+ T. V- f# }5 v3 c5 l/ f; L5 R
to move-turtles: \! r, D' ?+ F! A2 b
ask turtles [3 l" H! K/ S2 q f
right random 360
0 ~3 l% A1 a5 i( K0 I$ G/ } forward 17 w1 w; n+ s( q/ S! w
set energy energy - 1
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end
5 C) }- Y' k& Y: P0 L/ P% Zto setup-patches
( j, X6 V$ [0 C4 O5 O9 P ask patches [ set pcolor green ]
3 j4 ^0 ]# p: }end
w/ k& }- K2 A4 s5 U% r9 `' tto setup-turtles
6 t# f. ]( s, s; i. k, V create-turtles 100: A9 G; r: q* I! u( z6 P
ask turtles [ setxy random-xcor random-ycor ]
* y' Z& q6 _4 Vend
: P2 I% r6 L: D! U9 S6 `to eat-grass( Y8 R; M2 R& m; O
ask turtles [
3 M% L+ b" {1 }8 s4 T5 _) ^+ j if pcolor = green [) t @% m- {" @! k4 A0 m
set pcolor black
, n$ e! _" S, z; c5 }. m8 E set energy (energy + 10)
1 ~; I: @7 |2 J5 C8 W1 L- ? ]
' m" F: | _7 u4 k& { ifelse show-energy?
! { M# @3 T4 ?/ k [ set label energy ]
) O% T" H" z/ R P [ set label "" ]
) u# j, n6 q3 z4 m) L8 i/ S: \+ d. ] ], z" D- v1 p+ [; L8 ?; ?
end
6 ?2 Z6 d/ E- p# N- u3 b" wto reproduce
9 e0 ^8 J% b5 w% ?5 L) U ask turtles [
* k1 @0 z; Z, N k6 F, w if energy > 50 [! P4 I v8 t# Y' N) v e
set energy energy - 506 J/ |4 @! W, r. p- y
hatch 1 [ set energy 50 ]2 P, O5 w1 S# h; d
]
6 Q9 {" U5 G$ A8 L& J ]: _5 T3 b" Z/ ?, u. Y$ H
end) P/ m, c/ c! a
to check-death
$ A' r/ \6 u6 a5 G7 C3 y ask turtles [2 t; {2 ?. d `: S0 d
if energy <= 0 [ die ]
5 Z d& F$ h2 C- u, Y1 g ]
# n4 R$ Y9 y5 M6 f1 r k- H# Nend
B9 Y; D6 S8 U/ n: z$ n! Uto regrow-grass' t% a- P; n' {$ Q) p
ask patches [3 O# @1 V5 G0 r, W/ G% r# C T
if random 100 < 3 [ set pcolor green ]9 v; q% O; l; z! w
]
. M, J# E& P0 x% f) o) A" q& J: Rend
7 u2 U0 q4 Y2 i1 k' Xto do-plots g j8 }" R! F: j8 M( b* N/ X6 a
set-current-plot "Totals"' B6 p s# e) f# o( K3 h s. _( e9 b
set-current-plot-pen "turtles"
9 h+ t% D7 {2 ^! H7 y/ U) i2 q% R plot count turtles
' p1 r" C6 ?" f+ z" C9 M set-current-plot-pen "grass"% ?, }" V4 H) l$ E
plot count patches with [pcolor = green]
$ o( r' P. U0 b6 W/ T/ pend4 ]6 ~6 r5 O; R0 C3 f2 A; `
可是运行时提示no such plot: "Totals"
0 e0 E! A8 B6 u: ^4 V3 Yerror while observer running SET-CURRENT-PLOT9 m& S" W4 U! w6 H" s! r
called by procedure DO-PLOTS
3 }! a5 H( T J called by procedure SETUP
6 @$ O5 R2 s/ Z g2 I; X called by 按钮 'setup'; k! k2 o f" ?. S3 e5 H# a
求大神解答啊 |