我编的程序如下turtles-own [energy]
" ^ ~/ \1 k8 D8 Sto setup; M, s$ X( l4 o* a; H/ Z, r
clear-all- L8 X) ~. j& @" {8 m
setup-patches
0 y% T0 `" E( }8 z, O create-turtles 100# s# P# ?3 W' [& Y
do-plots; z$ f' p d- W4 h2 [( x- E& c$ O
ask turtles [ setxy random-xcor random-ycor ]( H- R& H; P, a4 Y& S
end/ V+ |# L' v9 Y4 K9 e" M$ J
to go( r5 D& _: i' U' Q, T
move-turtles
6 A7 A* y$ h! L0 e eat-grass
q! J, O! o* c. ]) Z0 L' Y l+ J reproduce
$ M/ O4 ~( d( b F8 j2 P$ B+ g6 k check-death1 [; A$ k" s g3 g; |+ s1 P" h
regrow-grass
0 G0 ]+ I( V; Q* V do-plots
6 {, _2 G& v8 K' Pend ~* P2 I" f' j$ I# T& Q" y- P6 Z0 D
to move-turtles0 ^/ q6 r( c0 I; y
ask turtles [
. n7 i! s% u' A9 f) C. r right random 360
. _' Y7 X2 k9 f! J forward 18 k5 ?" s; J9 [+ |- `, }
set energy energy - 1
4 F9 J; O9 g' O: d, ], F& v+ Y ]
9 M' B9 U7 f* _# v1 l0 R+ H; E* q. ]end7 d0 d; d7 y7 ^2 [& k0 M
to setup-patches/ p3 ~) o b0 ^6 y6 ^
ask patches [ set pcolor green ]
/ E( R7 |( u3 v7 Wend
: ?) v; C& |# M1 R) f# Fto setup-turtles
4 s5 o; ]& j0 i+ A% U8 n create-turtles 100
/ D: s( |. |! [- q9 G7 [ ask turtles [ setxy random-xcor random-ycor ]' k3 {- U2 E3 a) Q& \ a
end3 d1 v/ ^7 {# H
to eat-grass
5 I% z/ |4 N Y% l/ F2 b ask turtles [
+ X. g) w+ X# ~1 T3 h& o if pcolor = green [- I/ w- k. n# ]2 {7 ^ t
set pcolor black
2 U D" _% O h0 c set energy (energy + 10)- M( M1 z0 T4 [: U) y: c
]
+ e: L/ m& u) o! f3 `/ o ifelse show-energy?9 t' p# {3 b2 G2 r& f
[ set label energy ]
9 H9 a; H: J( i# h [ set label "" ]
3 w+ j, K9 b- h: a ]* Y: e/ y/ S% P
end
7 K R8 `" J" q' I0 H% ~to reproduce7 N& b7 ]4 g$ y% J9 w. L2 n
ask turtles [) ^. h0 e% N: i
if energy > 50 [% v* B. r0 B' ^/ W; L3 |2 |- C9 p
set energy energy - 50
0 i$ d, a% H* j5 x) t$ y) p hatch 1 [ set energy 50 ]
3 O8 g# v* b! y- j i8 O ]
; p1 l# O: Y d: U ]: K1 ?4 E% F4 A4 q( z- D
end
! ` Q. J% X; q9 `) G* K/ f$ rto check-death5 |; C) v# `' Z% y
ask turtles [
# x) s, k( o% k1 J if energy <= 0 [ die ]- k$ f2 p, ?: f2 [
]
( s1 w! c/ E, s. h6 }end& C% |, v6 G, W" o+ V' g
to regrow-grass5 Z5 q3 t( }! d) y1 T. h
ask patches [
% b% b7 `7 c1 }9 o* ?( q& k9 c if random 100 < 3 [ set pcolor green ]
+ P/ f, t9 a5 \4 o: t ], [' I$ w$ Q5 }
end# z9 g2 x; S# c5 j3 O+ R+ i2 @
to do-plots
0 C! ?7 @7 _% u/ X- P set-current-plot "Totals"; c6 c4 ~3 u; r4 y6 [
set-current-plot-pen "turtles"
, X! i: K$ q! V @1 H5 { plot count turtles
2 D5 j& e6 M$ u% R0 S set-current-plot-pen "grass"
! ]& l; |4 N! I: W) `) X3 k, ? plot count patches with [pcolor = green]$ X2 }) _& V9 a) P8 b- j V
end
9 `( E" \- V' }$ t6 |; X7 O可是运行时提示no such plot: "Totals"2 W. N N0 U' N+ u/ d. @* `
error while observer running SET-CURRENT-PLOT$ m: C+ ?$ \0 w5 \" B+ W
called by procedure DO-PLOTS# F* u6 g- y+ @
called by procedure SETUP( c' D# b9 N3 ?6 L4 t% {
called by 按钮 'setup'
' U: K; F. H. ?求大神解答啊 |