我编的程序如下turtles-own [energy]7 f7 G* C0 I( K, @+ U' u; L8 G
to setup
) q5 Z7 [/ U, Q1 w9 K7 H9 T; g clear-all E$ r! n0 _ Q% r# H
setup-patches, G/ ~7 o5 N ?; `2 v2 O
create-turtles 100
' b6 z6 u# q' Y2 _9 W' ] do-plots) u; [; o2 X5 w9 T4 v
ask turtles [ setxy random-xcor random-ycor ]
+ p7 G8 {4 X7 s3 `9 ^end
8 }9 D! c0 x. ^6 Z2 i% Y* w" ~to go
% U X F* W2 O0 Y4 ?4 y move-turtles: g M$ o* G8 K) f
eat-grass# @: T$ ]- p: o1 ?5 D
reproduce
, K3 C/ b1 A1 `. r5 X) k: x8 \ check-death0 U! I& {" f; p) b: U
regrow-grass" Q( a* n% p* |
do-plots
' j9 y2 Y$ L+ ^7 a" q8 @. rend( E, r" p- L2 b. H! T) f$ O; r6 y
to move-turtles
, q! e- P% B; `, t0 J ask turtles [) \& S2 w3 O+ {4 `( U Q# _
right random 3600 q' ]* A% L$ j, p8 x( r
forward 1
+ ^ B0 @; z8 j' H set energy energy - 13 i( m7 {4 n* N6 ~) P
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end% b& d* R8 s0 }& l7 p
to setup-patches
5 D' j- q: s' Q% Q7 s ask patches [ set pcolor green ]8 K, J: d* m2 g0 Y6 r
end
3 |' r5 V: J9 T" v. V/ t/ Gto setup-turtles
; s, k" P9 c R r( y4 K create-turtles 100 K: \6 n9 \3 w6 n: f# C' F
ask turtles [ setxy random-xcor random-ycor ]! h- \2 @" W/ k' S& W' ^$ i7 t
end
# k: }, y. \( Jto eat-grass
" F" a& Q: F( K; W' @' A ask turtles [
/ T5 B, e/ p( b if pcolor = green [! Q9 R; Z6 Q" m
set pcolor black
; s7 \2 j" x* H6 S$ a) m set energy (energy + 10)7 X9 F6 q( M: t. a. T8 c
]
, W1 w( k5 g, u1 N5 g: p% o& X ifelse show-energy?. v: L6 x; a6 C5 i: V
[ set label energy ]3 K) e/ |/ H6 N! [1 @( K, X; v h
[ set label "" ]: z7 l4 q2 A9 j0 a: [; p( P6 u
]
4 y! s1 a' X" S; B8 k& Q/ \end/ e* T! c& W5 p! ]
to reproduce! Z1 ?+ _: }- r0 I% M @
ask turtles [
6 y! Q, V) ~3 I1 Z; ? if energy > 50 [4 t2 G' i8 C @. x3 X$ C
set energy energy - 50
% [1 _, y/ z+ }6 ~& p hatch 1 [ set energy 50 ]6 T" g4 E. b' F6 X
]
& J# i- X, ^; w3 V: H" } ]
/ r; h0 [: J+ y$ Zend
0 n$ l1 U% B" \to check-death4 g: J4 g5 O* k
ask turtles [+ B5 r0 n/ Z( F* g0 S
if energy <= 0 [ die ]7 J( b5 A0 t$ W4 E
]
0 K4 I/ I2 n3 d5 U" pend; E6 r `( o# G' A* s8 G! A
to regrow-grass
5 @3 Q* i0 N) n) y ask patches [6 S5 p% {" q2 [' n4 P
if random 100 < 3 [ set pcolor green ]
' a, Y) K/ N$ O4 G3 D7 a ]
8 L5 `' A; I- W# w; g) Yend7 n4 g- Z, l3 l
to do-plots! a% K! R& V! O7 J# z4 u
set-current-plot "Totals"! H# I1 g; @1 k+ M& x
set-current-plot-pen "turtles"+ u4 u7 ]! R- C- O* c
plot count turtles! ~* p$ f9 j/ f! k
set-current-plot-pen "grass"
6 i9 k0 V6 c. n6 R2 l8 L9 h* ~, w7 _ plot count patches with [pcolor = green]
" h( l; l; M' M% ?9 r. Qend N( H3 D) G6 P
可是运行时提示no such plot: "Totals"
8 H4 H7 r" R( d" C terror while observer running SET-CURRENT-PLOT
! R. W. e6 h; E& v called by procedure DO-PLOTS
& q$ y$ H4 H( ?7 T0 X called by procedure SETUP
; E2 c* }8 x6 x5 [( k$ n$ h! L called by 按钮 'setup'7 a! T4 e8 ^; Y( N6 ^# s0 n
求大神解答啊 |