我编的程序如下turtles-own [energy]
# p1 V8 S5 A5 Q9 `6 u/ N0 k$ Oto setup. t2 V2 u- C: n& Z
clear-all
, s. G% D. m* x setup-patches
1 s# o* N5 s$ f2 j create-turtles 100
$ g1 `& j* _7 y0 N4 s" F6 p do-plots
0 X- b, I$ r8 N! P% } ask turtles [ setxy random-xcor random-ycor ]3 T0 d0 ?: v9 F9 r! K
end/ U% C# w/ _" b
to go/ r+ V. ^7 p# p2 z7 \
move-turtles
3 I% l9 L7 p' `2 d eat-grass0 u, \% ^& P8 F" l! Q7 o4 W+ b4 u
reproduce
# j- N- E! u5 w# v( D check-death
" o8 u- n, g9 n7 U* Z regrow-grass
6 b, f' S2 B4 k0 c: z E# H do-plots
: Y0 y4 g+ [: R2 X' E$ |end: x% ~ I' _& R. ~ H
to move-turtles1 g5 {* v. ?4 J) U: n
ask turtles [
: u- B! E6 y9 A8 k. _ right random 3602 E* ^# v& U5 r! ]) Q
forward 1
7 [4 C3 F9 b2 z" s0 n2 ~- J( l set energy energy - 1
4 g0 L; b- p4 Q$ H0 }3 y. f ]. q7 A" I6 X; R
end
; e+ w$ b# s6 F' [6 t Rto setup-patches
, X7 b% k' K$ a4 Q$ f2 t9 [ ask patches [ set pcolor green ]
% o: A' c+ f' D3 yend
4 V; ^. S2 R8 d! C7 P6 xto setup-turtles- j6 p! ?. X( I
create-turtles 100
5 } ~$ Q$ C/ \5 f* { ask turtles [ setxy random-xcor random-ycor ]
5 E' S/ Y6 L; R% P& j: O+ I) ?end
$ ^" n; q0 @1 J5 A8 C. s" Zto eat-grass
; X9 ]4 F1 J+ \! q0 C ask turtles [) l- ]3 Q; z1 Z$ I. J4 K% J- e
if pcolor = green [
0 |; u& C5 F, N' d+ {! h2 Y set pcolor black1 ^3 }1 F: D2 A) y0 @- C6 |
set energy (energy + 10)
1 i: G4 H- L5 ] |1 ` ]0 l! p( ]# C% E" m
ifelse show-energy?# e4 P% S* B5 z" B* F
[ set label energy ]
- f+ l3 `# Q7 A5 O0 [0 ~, `; v [ set label "" ]
! G4 c K8 O6 S& D7 J6 u% n& R ]
; Z+ q- X& Y1 s4 [0 wend
2 S6 b. `2 p: T& I! L. Ito reproduce
; o% @6 A* U4 s# C ask turtles [
; o( q5 F* ]. r0 o* f, f5 ^; ? if energy > 50 [7 L" W/ W5 b6 a3 _& v
set energy energy - 50
9 i* @6 e% ~1 ]3 \: u9 T" P; G% A7 b( I hatch 1 [ set energy 50 ]
0 s: d7 r. |, J9 Q$ x ]7 m% ^) ?: A* G
]
% \5 N. E/ [0 K2 W) Q# Yend1 e2 j% v2 { e7 ^/ Y0 L- y
to check-death
: a- E: h4 M" _, I5 T3 @ ask turtles [, _4 n: g6 r% w# i/ W% Q: W( g* n
if energy <= 0 [ die ]5 f' H; _% A$ _1 ]$ A. ^
]3 c/ F( l9 ^ X) A/ u3 D
end
( T% f4 g) ]+ q9 d0 zto regrow-grass# m* V% e6 u( O9 N- o" Y
ask patches [( d( `3 h9 y) }3 L) P
if random 100 < 3 [ set pcolor green ]$ m+ K: E# G' G
] y- j; I# }. s
end( p1 U: W8 {6 u7 R; K
to do-plots8 O5 K3 I1 B( K: {
set-current-plot "Totals"
7 H2 D9 ]% y5 ^ set-current-plot-pen "turtles"
1 \0 q' f2 b& n plot count turtles, M! m5 g; S8 S b2 d
set-current-plot-pen "grass"
( X( @! E/ j% E2 g4 B plot count patches with [pcolor = green]) T; a. v7 h. b* Z8 A" i
end l0 s. T5 m/ r0 J
可是运行时提示no such plot: "Totals"
, Q* F5 a5 W5 q! k" w) ?error while observer running SET-CURRENT-PLOT0 M/ H5 A" g+ E) T) o2 l7 f' M
called by procedure DO-PLOTS0 b* m& W/ L6 P0 x+ O
called by procedure SETUP2 d, C; u2 K$ Y$ o! r- \: q2 j
called by 按钮 'setup'* ~9 a' l2 E+ j# B2 p
求大神解答啊 |