我编的程序如下turtles-own [energy]6 D9 u( D, Y, w0 M" ]- o
to setup
: S# B: I/ Y0 J clear-all8 g2 y" B1 x( p
setup-patches
! ?# ?% K/ i5 N% p2 C) @, S9 k create-turtles 1003 C6 L9 N6 b! _( W+ V2 y
do-plots
- H& `8 C0 L' @; q, c ask turtles [ setxy random-xcor random-ycor ]& x; j1 h9 \3 K) O6 q6 v+ {2 [
end0 A. {# c+ w" ?2 z
to go
1 I1 X% [3 U4 _' U( C7 B2 f move-turtles
8 d( W6 o* {8 e* }0 b0 P, N3 W3 @ ^ eat-grass: c* N, v' @7 ^9 n" E+ m; z
reproduce
% |- T; x5 Q" B$ |, h check-death
% W: j* D4 ^1 m5 Y2 {& k) G ? regrow-grass5 u8 J8 b3 ]( `' r/ I# V" P
do-plots; y7 { H* p9 t, I) h
end. i0 n0 i! n) C9 o4 k6 x, \
to move-turtles S% R- C2 n" j. ]$ Q6 r: o5 t9 w
ask turtles [
+ [8 D/ j, T& u' B right random 3602 X. e% N' s4 L: g; ~3 e9 A! u
forward 1. Z8 H" D# Y! h( ~* A
set energy energy - 1. c2 C4 l$ G, b' q. \3 C6 r9 T
]
, k6 _2 F( O* L* Y# ^- d0 I0 R" Yend" r1 v3 D' f8 p4 D; S1 k
to setup-patches
2 ]( k4 O3 U' m/ X. x+ c ask patches [ set pcolor green ]
6 `4 w+ U/ Q+ Uend
- n- w) }9 Q1 h, X) x6 s0 m+ Kto setup-turtles# H) F- m8 _) H4 L0 {( C+ M7 L
create-turtles 100+ ]9 B5 `8 C" t, t6 X5 U7 O
ask turtles [ setxy random-xcor random-ycor ]
L5 n- j' T7 ^+ k8 N$ ~& aend
7 v2 I; R2 D2 [to eat-grass1 k9 S/ M& J0 k
ask turtles [
: ?0 j A! P% @, I4 w if pcolor = green [
6 O% S: U+ y6 G! Z' p set pcolor black3 \7 C+ |# E- h4 T# U, i
set energy (energy + 10)
. X, K5 l" ?6 ]3 w) E' o) D% u ]
+ l, f& R4 Q+ \ a2 ^# S# w ifelse show-energy?
/ k& @& }. a% {2 m; h2 t5 F [ set label energy ]( t# |: ^& V7 o0 G, K. r% S; ?8 y
[ set label "" ]
3 e0 ?. O+ C% P# u4 H$ E3 I ]# d% _% @2 |& X/ h0 t0 W
end9 f! c8 m% l J; G$ B) M
to reproduce& z( r/ {/ O9 Z8 x
ask turtles [
% u5 L( G" d1 S+ J/ {0 G if energy > 50 [5 @* q. O' D9 k0 ~; T4 G( R
set energy energy - 50
8 k& D: e; m* e5 U x9 v7 b9 c3 [ hatch 1 [ set energy 50 ]& z" L3 ?! b$ p8 Y- G! W
]2 B# y7 R/ o* F; p$ \6 r3 q# l
]
3 P: \& b- R, Z4 qend
9 L7 N1 F& n6 O/ {to check-death
0 L9 L" w+ i# { ask turtles [0 E: O# P& K5 A {* Q. e
if energy <= 0 [ die ]" q t L4 E0 Q* l
]: f) x) J- A+ a: M! [- L
end8 L4 v* G% ^0 H" W
to regrow-grass8 b9 G5 a8 }7 U6 Z, d* Q# `( ~8 J' o: ~
ask patches [9 H; B8 M" c5 K+ c
if random 100 < 3 [ set pcolor green ]* e0 V0 D: L7 u0 z& ?8 I
]0 ]3 j) i* K0 Z
end
% j0 o( ~1 t" ]6 @7 z9 u) Eto do-plots
( G) z: v1 f2 C- V# v set-current-plot "Totals"
5 M+ T" ~! d& _8 Q) { set-current-plot-pen "turtles") X C& q9 Q$ B- B- U5 X* b. S
plot count turtles3 @6 T4 Z# _; U* w! c+ j4 f
set-current-plot-pen "grass"
. W; i8 p/ Q) F' z( n plot count patches with [pcolor = green]
5 k# m, V" Q6 `; H+ H8 l1 ]6 Mend
2 n8 g+ k1 ^' `) h. w% @可是运行时提示no such plot: "Totals"
& | o4 B/ R u) ^0 f0 {error while observer running SET-CURRENT-PLOT; Z8 A: {0 c. y6 c
called by procedure DO-PLOTS2 W0 x. j. e q, [1 K$ E; O
called by procedure SETUP
. v: Q! _0 y+ Q0 _# K# r; x7 [8 Y called by 按钮 'setup'9 e: k3 ~( t9 z3 ^
求大神解答啊 |