我编的程序如下turtles-own [energy]
8 u0 g& {; W$ Y% D' C1 Hto setup
! y' ?" m, L6 u7 L clear-all
9 |0 L# s) F$ Z: z' y setup-patches
1 {) t4 y; J+ |- n, K% E0 q% o create-turtles 100
: x! l$ W8 _ n( |5 H6 z do-plots
* B! N6 i! |$ l! f* M ask turtles [ setxy random-xcor random-ycor ]
* x/ @! v) K7 }2 ~end
+ H1 p J$ i- m y# [$ Z" mto go
; C2 f% ~% g7 q+ t7 `- H" k move-turtles
8 F: @, }5 b* t- A eat-grass( p+ t# Y# M, Q& e# r2 J6 U
reproduce
4 k1 y- W! f" m9 a check-death
. `: g* {5 J9 a& @4 S% J2 k& @ regrow-grass6 l# E2 z9 Z: c3 \$ V$ D
do-plots% l3 y5 X1 q) u0 z
end
9 G& i7 }% {8 M- ~4 [7 w# _7 Vto move-turtles5 B2 S/ U5 P! }$ {, i. w
ask turtles [1 G3 d& I {/ z( _! ?3 L
right random 360
1 m/ ?4 U1 _1 [! |4 o; }6 e, A forward 1
' L) G* W% t5 @5 n0 ]' E7 g9 v set energy energy - 1. L8 i5 [4 G2 \& y& K/ K* `
]
5 F6 |5 \9 f* X" fend% n) d' ^0 o& X' M! y% Q
to setup-patches4 z! `& V8 d: ` [7 v! j+ E7 w9 T& n
ask patches [ set pcolor green ]
! E5 l# S" f; C T" h9 _& K) Nend
3 c& r7 H( H4 N+ Yto setup-turtles
5 [0 ~. f; a( b% `& L$ M. { create-turtles 100
' E- C' x7 y8 ^$ g- C( m% P ask turtles [ setxy random-xcor random-ycor ]
: g) K+ ?6 e1 u" u4 l3 E7 gend! I3 D4 y/ m" d3 F5 W
to eat-grass
0 c7 D- ^) v% i4 Y ask turtles [. j7 V- r2 K. R2 r O
if pcolor = green [
; I; X. E: ^. _ set pcolor black
' [9 H, p7 ^0 d+ C5 F) O+ F* V set energy (energy + 10)
3 N7 ?2 m' g. r5 b5 k0 t b7 a ]1 B# R- G2 `1 S' _# ` I2 `+ F+ d6 u
ifelse show-energy?
0 M# B7 t1 E0 s: M+ F [ set label energy ]
3 c' d5 O7 _; h' ]+ q" e, h1 X [ set label "" ]3 S1 [2 M, e s( i* }- `& F" _
]% ] M7 f* P' S4 E, F i& a+ X- G
end3 y# o s" `- l, v% X
to reproduce9 G5 Z/ T! ^& G9 R+ o
ask turtles [4 q2 F4 t3 q0 N
if energy > 50 [
4 l. m S& n+ t9 @4 D set energy energy - 50
* F1 M+ J5 t6 K; c& A: X hatch 1 [ set energy 50 ]
3 |1 S* m8 O# W ]
: c/ `1 o& Z6 ?( M+ k ]
* j# e. j& ?& R# k! I% S, P% Nend! |, P q6 J( o) ?
to check-death
3 }2 [% D9 n d3 j9 ?0 U ask turtles [
, ]1 v% f( X" i: {6 }, C) Y if energy <= 0 [ die ]0 ]- {0 s/ |; I0 M6 h
]4 `# i, c3 y8 i. ] w
end
; D7 [$ ?9 S* f( r5 c* H& P# uto regrow-grass9 e. K& ^5 ~( o' j- F8 [3 P5 X
ask patches [# ]- |+ p3 ^7 K2 z
if random 100 < 3 [ set pcolor green ]2 C# z! n- h4 E1 |$ Z: n
]' a, z* C D. c# f
end, V8 _* H! R7 U+ v2 g; [' Z+ n
to do-plots# N. I; b8 j& d7 Z7 ^& F
set-current-plot "Totals"
# f+ d( ?2 c2 _ set-current-plot-pen "turtles"" x+ m" u- \% C9 ?% u$ Y9 p5 _: |" w
plot count turtles
( G$ F8 r6 ^% Q set-current-plot-pen "grass") K7 f# X9 t, f: ?* f7 {, s* H
plot count patches with [pcolor = green]1 O$ K9 e& `4 _, k3 p( K) x
end
T6 E) [( s3 y6 c3 y$ l' z) Z0 z可是运行时提示no such plot: "Totals"
3 I4 f$ a4 M+ o, e9 cerror while observer running SET-CURRENT-PLOT+ D' T8 W! B6 |1 _- k
called by procedure DO-PLOTS
$ ~ F7 {& e- x called by procedure SETUP, e4 J* B5 \* S% _
called by 按钮 'setup'; ^; E0 E+ O h. d" l; H5 B
求大神解答啊 |