我编的程序如下turtles-own [energy]
. P8 A- A- Q& q( V) y# u7 P2 Mto setup
, t0 |" P% P3 O4 B clear-all! y: t; f) }7 r z
setup-patches
9 D: Z; W% R6 R2 ^9 b9 | create-turtles 100$ g6 k* ~1 k& `. A( [
do-plots) e& d( l& O7 ?% Q
ask turtles [ setxy random-xcor random-ycor ]
4 @# {7 ~, D W; n& p0 {end2 {! F) K1 @. z, T
to go
4 x& [- \6 F( V; q4 a. d) C move-turtles5 M/ |! Q& F6 h! o/ w
eat-grass" B- o: i X% {3 |
reproduce' F) Z( T0 V0 v8 `& l3 z- m
check-death' v) m% | S/ }' R' B# ^. W
regrow-grass6 g* `/ ?9 b% ?
do-plots
, \2 h! V( n, h7 K' {( O- gend% g- M0 Y/ @4 e% x& h* e3 g
to move-turtles
1 A5 G6 z6 V- e2 I& J( C4 z ask turtles [
4 Q' \- n# u" m! n7 D right random 360/ c/ x. j% L% |# u) e
forward 1
" r. X/ ^2 D* _7 D$ Y& p, x8 F set energy energy - 1
4 E! `) I& t# u+ c5 J$ t, n ] d. l$ n5 ~6 ~! }
end
# |! i8 B9 C' X8 A$ K! `+ ?to setup-patches7 G/ k8 O& r) L
ask patches [ set pcolor green ]" ~" f2 l2 F& E+ f$ c6 z
end4 l: `, [9 N. W: c
to setup-turtles
# F) z$ z+ Q' r, O create-turtles 1000 M$ n% p$ `1 f0 u# n/ u& P
ask turtles [ setxy random-xcor random-ycor ]
& D1 U0 X5 B! `- _% zend
# J4 y6 f! r* N+ A! v/ Uto eat-grass/ g* p5 \9 X7 h, R+ ^
ask turtles [
0 N" P' G' L3 v2 ]2 _3 ` \ if pcolor = green [
5 r/ e8 Y0 G8 K( @ ~, B& V0 p set pcolor black2 o/ Z$ @7 Z+ N- w" K$ M" M
set energy (energy + 10)
$ O, h1 \5 P, g: `8 g( T8 d ]& c" C# P/ p, I5 S' d
ifelse show-energy?& c) q, b1 A% X y B
[ set label energy ]
+ r( Z4 S$ ~9 g [ set label "" ]
+ A; C7 j3 `$ N- D Z ]! R& ^1 V( Y" S- Q
end
, \0 D& U7 E% M9 N4 y# Uto reproduce
( G1 y: z% v4 z, o ask turtles [( W5 i% D9 n4 V, I, d
if energy > 50 [4 P9 M( }% u9 t* ~* H+ G4 z/ ^
set energy energy - 50
; o% h( O- Q x+ J E hatch 1 [ set energy 50 ]) L4 E3 B0 \5 M2 h
]7 }4 O) h- O: n Q, L7 A' }1 b( X
] ^- y8 @0 s7 p5 B/ s
end' H5 d. e; S C- J( W5 x U
to check-death
2 X+ N, j) f! f) { ask turtles [
; |( s) a2 v9 G. u9 p if energy <= 0 [ die ]
& `5 \4 Y& C" V- T ]" f- G# b) W! L
end' w5 R5 e: C( ]
to regrow-grass
: ~% s# U- M4 ^' {$ H, O* H ask patches [
: s+ a6 o* M8 g5 P# w! } if random 100 < 3 [ set pcolor green ]3 R! B l7 \: x \
]
$ `* j* t1 V9 V- Qend3 W, c: b5 Y6 t; \9 `& q
to do-plots
# M; K% |( l Y/ @; T; M set-current-plot "Totals"
8 f. m; T' d/ j( h- |1 v set-current-plot-pen "turtles"$ Z* W5 r' S9 i5 X! \6 v5 ^
plot count turtles
7 k" S7 y6 C& m% I set-current-plot-pen "grass"/ O5 R; W' G' d' l0 g4 w t3 a
plot count patches with [pcolor = green]
$ g- e5 L' |6 K5 H9 hend
0 d: l. M$ c ^' f6 t" {可是运行时提示no such plot: "Totals"4 I2 |" B5 G3 T# `) R4 v6 |( f
error while observer running SET-CURRENT-PLOT
4 e4 F' K, o5 Y) b called by procedure DO-PLOTS
; X8 D' T# b7 B- ~% z9 g- R called by procedure SETUP
# _0 j e# @" J$ {3 f called by 按钮 'setup') E0 G8 S5 z: h
求大神解答啊 |