我编的程序如下turtles-own [energy]
: U4 m/ t, M N+ Q" A& {# Nto setup- J8 y3 Q$ Y, l6 j
clear-all/ q$ t1 d% V% p1 w1 B6 u. i* _
setup-patches
7 J+ T( F/ k' M* j create-turtles 100
/ w4 K8 y# V @2 B do-plots
- F/ @7 `' a3 |! J7 U- S ask turtles [ setxy random-xcor random-ycor ]
) R; U T% V8 `5 H+ kend
2 U5 @" X; r6 K6 E7 v( L+ `0 Yto go
0 O: r/ P( N0 m: y move-turtles
4 P8 W$ ?* U! e2 Z1 | eat-grass
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check-death
: v5 j* c5 @1 f regrow-grass
7 B+ i2 R9 I! @( y- Q, w do-plots
2 D6 l0 r. Z, t' \2 g& qend# l7 ^, Z- q& F
to move-turtles
8 B3 ^ x" _) k( }/ X& \ ask turtles [6 a* e: N- U8 H
right random 3605 B$ F) s# l8 V) O
forward 1
. M* |/ _/ a2 C) B6 e8 o% c' \! L set energy energy - 1
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9 E5 j% ?$ k8 lend
& V7 c6 @0 u; g+ f# z( _; l1 _to setup-patches2 B" p$ ?7 ?2 ]( K j
ask patches [ set pcolor green ]
6 t. \0 K) r1 {% V* E( v$ i+ R- Rend
. ^8 f& {9 e. O3 pto setup-turtles7 g: ?) W u# J: j' ?( I. d4 D0 x( f
create-turtles 1007 k2 x! A) H" Z3 n3 V
ask turtles [ setxy random-xcor random-ycor ]
7 _$ ]1 F- s- n3 F8 O2 aend
% ]% m7 D# |8 y5 bto eat-grass
5 S' `: m# y0 G: n, S ask turtles [: J s& r- B1 A* `
if pcolor = green [
7 P3 x( T' c) I; \3 I4 ` set pcolor black
; ? Q% B ^" [9 _$ l set energy (energy + 10)
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4 [( r- J0 q# A" z ifelse show-energy?8 X4 v! Q3 K7 o9 J" _% Q; c3 x
[ set label energy ]9 X6 v2 Z9 q1 ?: H' d
[ set label "" ]7 N. p( t' t- s8 U: H
]4 u% y/ g' {( u0 H' Z+ d
end) D- z; w! s; W- l3 [
to reproduce& {. ~. Z3 }* f q7 }
ask turtles [3 v) x! u {* [5 `5 N6 P* _3 `
if energy > 50 [" H$ O ?/ Q# h6 X4 ?2 a
set energy energy - 50
& L. s1 j. x [1 R! F+ y hatch 1 [ set energy 50 ]3 x7 n7 [9 c9 l0 y
]
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end
% }9 j5 ]& q6 Hto check-death- I6 o' {% D4 \$ E
ask turtles [
3 @: w$ T4 L9 C if energy <= 0 [ die ]
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end |9 D) m1 }- r# E Q8 O% s
to regrow-grass
2 l& J6 {- S. f0 {0 {, s ask patches [1 j+ n4 I \1 R/ Y! c
if random 100 < 3 [ set pcolor green ]
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to do-plots
; o! n- H- w- W( v1 s set-current-plot "Totals"
2 Y9 b% x5 E8 T. ? set-current-plot-pen "turtles"! ^: R8 _/ P/ Y( ]4 z% ~* F5 r
plot count turtles/ t, l4 M; A# V% d
set-current-plot-pen "grass"
3 I5 B! _2 ?8 K' v0 `, f: d, L plot count patches with [pcolor = green]4 t; T/ l! _1 e6 M% ]
end' K' K$ {2 ]1 o7 N! n1 m2 W0 }
可是运行时提示no such plot: "Totals"
% B# `; G/ Y/ V7 V; n$ m' jerror while observer running SET-CURRENT-PLOT
1 p" E8 J0 e( A2 S% P: g2 x called by procedure DO-PLOTS
, I3 f5 J! L9 z4 Q% f2 _ called by procedure SETUP/ H) i0 N) m, P$ d( b
called by 按钮 'setup'
0 u8 J5 _# [5 r# N' k求大神解答啊 |