我编的程序如下turtles-own [energy]
7 B% H! E4 f" O+ O0 ?7 }: I, hto setup
! @/ l2 ?: [% [, J+ }, D clear-all
4 L z8 {# l1 U1 k' L setup-patches+ R. X5 R2 h. v4 E+ p' J4 x, r. g9 _
create-turtles 100# M' W5 w G" W# D! a. K W N: Z
do-plots1 b+ D% Q0 c- C4 Q
ask turtles [ setxy random-xcor random-ycor ]
8 v% j/ F0 t9 R6 y# Cend1 Y! N" i$ l! o* o# v
to go
* `- D$ ]/ C1 M- U; u0 P move-turtles" {5 g& ~1 `) P- J5 F) m% G* E6 {
eat-grass
: |* `$ |% \8 o reproduce2 }% |$ E# B8 v
check-death! z: n) @, D# x
regrow-grass
! V( g8 z. a) d" f" u' v. M do-plots
2 ^ B; [+ f R, mend
3 Q, j% M9 G8 N9 pto move-turtles" ^6 n A* ?$ Y1 w+ t: a# \% y
ask turtles [" O$ ~# V: a8 @- c5 f6 L
right random 360& v5 X! E; W# A* v+ \* z
forward 1& o5 [* n( i8 k/ v8 D
set energy energy - 1
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) J% @2 F, m: B" q" mend0 B1 C# u& p$ ^6 L
to setup-patches8 ~: c; K( F& i! x% E1 i5 Q
ask patches [ set pcolor green ]
' D$ L, I. l x, y+ G) a3 \2 U0 _end
. Z: o2 ^+ j) h$ Rto setup-turtles6 y/ M6 O$ j- R1 i6 d) V F! p
create-turtles 100
! S4 N( t& \: e2 Z- G H ask turtles [ setxy random-xcor random-ycor ]
# D G5 |( g4 n/ f# nend q* k& c r( u _- i
to eat-grass
0 S' \$ X3 E" r e2 F ask turtles [
- b. |5 w! ?1 x. {* C if pcolor = green [
. O. N) m4 A" N* I, \ set pcolor black
e, v6 G$ O6 s4 Y# P) r set energy (energy + 10)5 F: f5 Z) M6 e1 H: {" z
]7 p% l% I6 P M5 V6 h) s
ifelse show-energy?7 y' j! V& J) Z/ Y( V
[ set label energy ]
" ?! x5 f0 U, n; E! t [ set label "" ]
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end/ k/ u8 t- A! C5 w) B
to reproduce
& g2 V$ q4 ?$ j8 ^ L6 @% u ask turtles [
* z1 G& F/ M5 s; R if energy > 50 [2 d. @! j! R* L; K+ z/ A
set energy energy - 50
& G$ D% n/ l. c- H0 D hatch 1 [ set energy 50 ]
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end
3 `9 K1 I% B* t4 G# eto check-death' W: G- E( r' u" @! i
ask turtles [
; y: E* Z5 I# u: {! E0 P+ Q if energy <= 0 [ die ]
* p- Q4 v: { J( ^. W% S ]
( l; z# t9 x, ?: Aend
3 ^/ |7 ?3 @% U7 a( b2 J5 {3 Ito regrow-grass
! K& `0 Q/ e+ v" Z( k% S9 l$ J ask patches [
4 @& r, A4 N% A; V) {7 ]; z if random 100 < 3 [ set pcolor green ]
' {' `2 R) C0 l& z+ ` ]
. Z6 Y8 F3 w; `+ V& |$ G7 Lend
6 F+ z T$ K3 Q4 Xto do-plots* f5 G7 c0 L/ J4 S' Z
set-current-plot "Totals"
: G, T: e# O- C7 U4 N, s/ d set-current-plot-pen "turtles"3 z7 _0 Z1 m$ `, Q" @% {: \: Y
plot count turtles
% `6 Y. F) y; g& Q* ` set-current-plot-pen "grass"
0 l9 _) N3 i, y1 |/ ^ plot count patches with [pcolor = green]
5 ]# w1 c! \8 q/ V/ v- ^end
" A1 u0 K$ |! l( z6 R, a可是运行时提示no such plot: "Totals"# b) t1 f, k. p# S4 x
error while observer running SET-CURRENT-PLOT
' g! I3 B) ?6 d3 K called by procedure DO-PLOTS
+ R/ X' u a; h' z; c1 } called by procedure SETUP* }% K2 `' v3 M [( ?
called by 按钮 'setup'5 g e6 F+ D* ^
求大神解答啊 |