我编的程序如下turtles-own [energy]
; N, p+ Q9 l2 [' B6 W, ~6 Q, `& |# sto setup; m* Z+ T( }( V2 v1 {
clear-all
' r4 n; ^! L7 s9 ]* Y6 t) C! U setup-patches
1 M' A u6 ~; l! p) N. H- e p create-turtles 1008 C6 o- G6 f3 _) L
do-plots
. \1 }# o$ {: G5 o# w6 Y! L ask turtles [ setxy random-xcor random-ycor ]
. Y! k) b9 @$ s8 b8 Dend
, j4 A4 ^& {& I7 Kto go
# P0 i$ e7 U" f5 E1 v move-turtles
0 D7 G0 M( \8 d: V eat-grass' x. _ t# c8 t3 H" {: q5 }+ x$ |7 [
reproduce
1 K1 b8 h% W, S S$ D check-death9 X6 K4 x% U7 U
regrow-grass
, x" Y; f4 ~4 n h0 ]* q, L& V do-plots
+ M+ P$ l" q& M2 }5 [end- |& G2 U1 C" m
to move-turtles# j! q! o$ _6 `. n4 Y
ask turtles [
. O, k' H& D: W8 l) V right random 3609 m4 P" X: D5 P
forward 1" e! H5 G2 |" v1 o
set energy energy - 1% I+ l; Z% [& l1 W5 O S' z3 `
]
! S6 t8 z: ^- ^) W, U, |( [end
# P# t5 `. T1 S( l: M0 Ato setup-patches a9 w# w* Q/ O3 w
ask patches [ set pcolor green ]
1 I! M; K0 [- q5 O7 Z. wend* G6 ?$ e: M% j
to setup-turtles( v$ L* r0 W# V0 ]1 v0 q7 O
create-turtles 100; \/ p3 b1 C0 R8 j( I
ask turtles [ setxy random-xcor random-ycor ]
+ H) l* O% O, N$ z5 ]! Hend; W. v* F# Z$ _" M' B5 o' J0 l, e: l- D8 f
to eat-grass) D$ o2 c% @; r9 x# X5 M2 d( p, d
ask turtles [
/ w- v1 q7 t/ p. f: v4 N7 ` if pcolor = green [
1 P0 ^, B" {# y5 m% s/ U* b set pcolor black
- A8 ^) y" d& h1 e$ p) W# { set energy (energy + 10)* {* l1 [! }# v
]7 U! B* I+ q" \9 b9 e
ifelse show-energy?
# M# C8 g, F# |( \$ c [ set label energy ]
4 K7 b% x" z7 p$ P# p) F: b) h [ set label "" ]& r! U. Z! J( Z( D5 y! [( k2 j* @
]% |- z& B: [5 p
end
0 [# I( T3 H& Y1 V! Z, C4 J5 bto reproduce
6 l& y& y; k0 Z& P7 U% B ask turtles [8 T% P/ V/ v# L" F
if energy > 50 [
2 s c3 P$ o7 v& d( U/ W set energy energy - 500 m7 w; `( X0 }& \
hatch 1 [ set energy 50 ]) K3 B, _" ?! U* p# a
]7 @* a: k- l0 j s' Y
]
& p( u. b- U- c1 K7 V7 ?end: g/ Z! p8 J7 X
to check-death
2 N2 `% S5 {2 ], I9 h( w0 A ask turtles [
, ?6 r) D, x ]1 y" N if energy <= 0 [ die ]
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end
4 b9 k# H4 o6 D- C: M5 O# |' Hto regrow-grass' b8 S% K. _0 q/ t- m- K
ask patches [
' _) O0 o! x, W2 D* G. M1 ` if random 100 < 3 [ set pcolor green ]
4 ~4 ^1 ~ O1 [4 ]/ Z+ R+ Y ]
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to do-plots
5 H p# n" l, i set-current-plot "Totals"2 X$ T7 t) U$ A- v1 T- Q
set-current-plot-pen "turtles"& ~8 V! v' q' i5 z0 N! S% x/ b
plot count turtles! Y! b8 G" [6 ?+ |' F$ y
set-current-plot-pen "grass"
8 q8 l8 ?! v: m9 x8 v8 k plot count patches with [pcolor = green]
% R, w0 O# ]- F$ a" Vend
! E) i# S$ j" d2 J5 C$ ^7 t$ ^可是运行时提示no such plot: "Totals"
) V9 s1 i! A. `- K# M) Cerror while observer running SET-CURRENT-PLOT/ h! z+ N% C m6 R2 b/ i2 E
called by procedure DO-PLOTS
5 f& T/ z# ]0 E) @8 r called by procedure SETUP
5 S$ M5 b" G2 C4 Y! e4 [! c called by 按钮 'setup'" k7 t$ W5 R" T9 K6 H0 f; ]* f1 }- s8 {* K
求大神解答啊 |