我编的程序如下turtles-own [energy]
j. D! `; V. ?$ z: J$ rto setup
" \$ ~* g$ c" ]8 O8 ~9 P- _ clear-all
4 m: n& l2 r! U1 B7 _5 o* J setup-patches
+ e2 J X z$ w5 g6 X4 j% Y create-turtles 100
. _ `6 |' E! A) w3 }* Z7 Z do-plots
# `' @% v8 q3 ?4 z# r& b; ` ask turtles [ setxy random-xcor random-ycor ]
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to go5 t7 x% n9 `& C. U' a3 k x# ?
move-turtles- S- i& p$ T6 k
eat-grass
8 H/ G9 F7 s- @( [2 Y$ D reproduce
2 |0 e9 K; N: r: R check-death
' h3 G; c/ r! `2 A7 }3 M# |/ e regrow-grass$ h5 k: Z. p+ s. C" Q
do-plots% _- |3 u* N4 M, f& n( s
end- D j5 E# `% g
to move-turtles
3 ]2 ~5 S/ C+ @/ N9 R0 i% K ask turtles [& L- |, L1 S7 M, F( N7 E( u3 r8 l
right random 360
2 q6 X# n j/ i/ Q% \; J forward 1
1 @8 O8 I& k2 j set energy energy - 1
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end
0 j! [, C/ ~2 S Eto setup-patches
+ E( ]0 x2 l& E) b ask patches [ set pcolor green ]
, O5 g1 E% {; d7 Xend
+ l8 ] j0 k) L2 {$ |4 k7 y8 s, ?to setup-turtles
# K. q: y' R5 R6 h create-turtles 100; ~" F& I; s( F6 [& I: N8 D) Y
ask turtles [ setxy random-xcor random-ycor ]6 p9 k8 Z0 I+ z* T) t; q3 h5 h
end3 a: b% E5 L: O7 g# [* T
to eat-grass5 Y( Q( C2 q( q7 R9 F2 _% l
ask turtles [
3 k6 ^% s( z$ e ` if pcolor = green [$ z% O6 ]5 v+ H3 v
set pcolor black
0 V- k" v6 K% a! a# N7 p/ u set energy (energy + 10)
6 B( T. f2 Y H$ _1 c9 ]8 Y ]
9 X1 B v/ _ P/ _& {: E1 | ifelse show-energy?, q3 R. ^5 `/ C- f
[ set label energy ]
8 b6 Z0 B0 P& ^' B3 w. B [ set label "" ]
+ p- E! C4 J% E4 K7 l' |2 q ]
4 O6 o g3 p vend
, P1 V4 H1 A! lto reproduce% r1 V( [5 x, N2 Y$ ]
ask turtles [
$ a$ W. [# I% _8 e% e if energy > 50 [% ~/ Z" C1 P) F+ Q
set energy energy - 500 a7 @% q3 l9 t. o" }
hatch 1 [ set energy 50 ]2 n! N' I- S, Q2 Z
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]
: [ {# U% R/ Y9 `end
2 {( r- h2 W# K5 q: y5 M5 i- G% jto check-death# t% p2 u0 R; x8 o6 i6 i7 W
ask turtles [9 ~6 F+ L0 a* X4 ^4 d" C) f
if energy <= 0 [ die ]+ m4 Q4 x) O$ L0 E0 ]: _
]
, u/ g [$ i7 o, h: `% Dend! T6 @' n( z! N" O' G8 |& V
to regrow-grass
, U5 q$ T8 c8 C4 k3 }$ B ask patches [
' H# v8 u! z3 F, i9 t if random 100 < 3 [ set pcolor green ] S- {5 J$ x/ f2 j6 O
]8 V* K' K& e& m5 B* f
end
3 l+ B, K' h/ k7 G- w* `5 P& oto do-plots. `; ?, n$ Z) i( ~5 B( j" f9 l( |7 U
set-current-plot "Totals") y: k7 p- @/ i! H1 G) U" F. d
set-current-plot-pen "turtles"
, J& F! W# D/ U/ @ plot count turtles% w `& |3 \8 B: J
set-current-plot-pen "grass"5 F1 d, w4 {4 V* W. d l' j
plot count patches with [pcolor = green]
4 _. r8 U, S/ n/ ]$ z* t8 ]# oend5 N) o, ?9 T1 r
可是运行时提示no such plot: "Totals"' T( m! \& P1 d; |2 k8 W' R7 u
error while observer running SET-CURRENT-PLOT
9 W& T S0 R. r9 Q, M( j7 P6 b called by procedure DO-PLOTS
( ?3 D: c) u' `! q called by procedure SETUP
# o" v9 i: n$ X9 C. I called by 按钮 'setup'" H2 X" e& H g5 V) p) b
求大神解答啊 |