我编的程序如下turtles-own [energy]0 [( \7 d$ \" c! o) k! n2 A; y
to setup
- m0 v, S: e) h. r9 N clear-all
0 L0 n. S0 {6 b% k: {6 t) C setup-patches
+ U( x5 j" F6 A8 u create-turtles 100: p# ~* a6 J( p
do-plots
. o7 W$ K* d" m ask turtles [ setxy random-xcor random-ycor ]4 \ r8 o9 W6 a. A
end# F# p7 r- }& ^5 I* j
to go
$ Y M5 c8 _. D% Z( r! b/ [4 q move-turtles
4 m. K# q+ M4 h, v5 u9 c eat-grass7 Q3 r- G6 d; _; g
reproduce& H% Z' ~% F, q" b
check-death" b. K" k$ G- @
regrow-grass
& ?, ?: a2 _# w5 [7 ] do-plots
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to move-turtles
' ^% ^' D5 y7 e5 {2 _( r; h# p; U ask turtles [/ P" ]" h$ L% h/ x0 h
right random 360
% N/ ~! y7 D* Y @# W2 o forward 1% O9 o* k. ~7 I/ c* I8 g
set energy energy - 1
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end
. ^2 `. K- J3 s) q4 I; Z3 |to setup-patches9 L R W, E' E) j2 X: d
ask patches [ set pcolor green ]
' P: P) e2 u8 a. B0 }# d& Qend8 ~/ A0 }5 n! I" u6 E
to setup-turtles, {# r1 F# T% h: ]. L4 a
create-turtles 100: }( Z% w R6 S
ask turtles [ setxy random-xcor random-ycor ]9 d, W9 y \. n$ ~4 W# s
end
0 q; l5 i( _1 j) _to eat-grass
/ A* P* a: n F& i/ ]% D ask turtles [! J% y$ k6 B2 e) p
if pcolor = green [
- m1 i( i6 {7 b9 H2 D0 V% ]2 U set pcolor black& C# g9 r9 z; K8 K
set energy (energy + 10)
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ifelse show-energy?7 s) R4 n, [% m1 W L5 c
[ set label energy ]- A- V. M7 o, L* B. v: i; ?
[ set label "" ]8 F2 U1 {7 T9 w7 o4 U, I0 ]
]
+ E+ b* ?& n `4 Aend
+ A) K( a5 I0 yto reproduce
% E- r$ J! O& l- e" |( Y A) v ask turtles [, h1 T# K% S5 k6 c: C! l' C3 K* ~; z& H
if energy > 50 [$ T$ i# F: @( G Y$ k# M9 m
set energy energy - 50% ]4 J$ e; s0 E7 g$ \
hatch 1 [ set energy 50 ]2 p. d% |) L8 f
]
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end: S1 L( G7 J$ i- p
to check-death$ s) O8 M% h' Y% U- r# h
ask turtles [0 m" ^* K$ Z2 T
if energy <= 0 [ die ]) |* v( s! ]0 | L
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end! a, ?7 P4 l c- R
to regrow-grass
' n; f- g; L0 g( }- v ask patches [7 L0 r& I6 C/ L) v5 r0 ^" v
if random 100 < 3 [ set pcolor green ] J1 O( Q0 R5 w! ]
]( \: D/ U# ~4 c* D
end9 \ L/ f: G! l4 e( m9 z
to do-plots
! p F0 E: ?0 t9 h p/ {" V set-current-plot "Totals"; _2 W4 p/ f! D! K
set-current-plot-pen "turtles"
6 u% V7 O; [3 J6 j plot count turtles
/ U( {8 u1 V# C; S0 c% r i) f set-current-plot-pen "grass". H; e/ k' d1 f
plot count patches with [pcolor = green]
( y8 H+ J: N$ M. q3 Qend
1 o3 B+ H( p3 a; w& L' `, }/ W可是运行时提示no such plot: "Totals"
0 r/ {# Z& u5 L% x: I) p; merror while observer running SET-CURRENT-PLOT
: F3 h" B0 E* b6 ]/ y7 L called by procedure DO-PLOTS. ^8 `6 S- r0 I* M2 `' d) ]& f2 {4 B
called by procedure SETUP l1 X% m3 V- d# n: l' r
called by 按钮 'setup'
4 @7 v0 h) P) }; d: D9 S6 J. j求大神解答啊 |