我编的程序如下turtles-own [energy]
& O2 h8 D% E/ Jto setup' p( c# K9 \: r" q% W( @) A
clear-all E: L+ r6 ~$ Z8 b" q
setup-patches+ R* r" M! m- ^$ c: j) f( I c# W5 Z
create-turtles 100, V( l5 {' X& ^2 m
do-plots
^) y! w+ ~: l" q2 t ask turtles [ setxy random-xcor random-ycor ]8 u% ~8 V3 n. \4 q
end+ f& I" D1 @9 m
to go
( d1 c$ A' d" M- G$ | move-turtles
5 ~/ T. T& }* h6 Z eat-grass$ _2 {& \7 ?8 t/ N" g1 P" `
reproduce+ F: M4 O9 _( l$ M2 ?) ~% K, j- g, X3 i
check-death
! ~8 L( Y; w9 C; ? regrow-grass" Q" ~& W2 B8 v% _# d
do-plots
9 L% Z9 X0 t% b n+ Eend! ^' E7 h5 ^) V) Y4 R
to move-turtles
$ P3 S: U( O6 A1 u. n: a7 y ask turtles [
- o% M" L5 K0 H; Q2 V$ Y right random 360+ P' |* O6 M" n1 b$ p- a3 t+ o
forward 1& H1 y& f7 a4 _
set energy energy - 1* ?4 Q! s- w6 h {! R& k
]
8 X6 Z0 O+ p- ^% w! b, fend6 q3 E& o1 E$ Y$ J' ~) c
to setup-patches- P2 b' d9 h& I9 ]) K6 u7 C" w
ask patches [ set pcolor green ]7 Y$ P' ?7 t+ O4 c5 d( x5 v9 S8 N
end4 T+ w6 c5 }% ^7 {2 D
to setup-turtles3 ~% v2 \; i1 j8 S: i, Z
create-turtles 1000 @( J+ z; M d8 g4 N
ask turtles [ setxy random-xcor random-ycor ]
9 Q3 @% R2 T8 `; g7 }+ i1 `end
$ k+ t6 C; I- j0 k1 ~to eat-grass
7 ?; r$ P) u3 j' H& ~ ask turtles [
g9 B* g" z9 e, z, M0 b! ] if pcolor = green [
( K, c# x ^3 b3 O/ n: @/ m set pcolor black
% p& }2 L$ C# @* ~$ m set energy (energy + 10)" ~. W. ]* R b/ ^
]
& @5 D( U& z0 u& ] ifelse show-energy?( H9 A2 C y# X
[ set label energy ]2 h/ [" Y/ V4 U
[ set label "" ]3 M, I+ C7 x) C2 X" a
]
1 j2 K- p3 W1 {end* @/ T) Y: w0 k
to reproduce& L) k; z7 P9 K- S2 s9 i* M* {
ask turtles [2 K5 ^$ A% p v- l0 [
if energy > 50 [
" b' g! c4 x' u5 F% c$ j3 w' E* {6 h set energy energy - 50# F$ q( f& C. ~! K: V
hatch 1 [ set energy 50 ]( K v4 o# u( { {2 P" T/ B8 n( v
]
( J% j; [4 Q. P1 n$ `5 `0 J W ]' N0 H& K* c; R* @9 x& ~9 \9 n
end
) q2 L9 Z* J! t: u2 sto check-death$ s" s, c/ H; Z* H
ask turtles [
4 U' H' v( N9 ^+ Q. H5 Q if energy <= 0 [ die ]
8 c2 x1 J% c6 C' f4 F ]
- F) ]" P& [; b0 k& y, zend
* n2 K! j! i ?, d! H& V/ Pto regrow-grass4 } J5 X0 G& B* h5 y5 c( B! v
ask patches [
7 R4 [4 C( ^, y- ]8 E3 T* j6 o7 W; x if random 100 < 3 [ set pcolor green ]
]8 L, f$ L* ` ]
4 ]6 R' [4 Z6 |# P- x: C* uend, ]9 h# y4 Q6 S: B& ~
to do-plots
1 V$ j4 {. F$ P* |) u S' @ set-current-plot "Totals"- o Y/ W9 c* f% N
set-current-plot-pen "turtles"
" o* V$ a3 G5 ?$ z- C7 O0 U+ i plot count turtles- r) c: a5 u$ {. _( A. a5 ~* N
set-current-plot-pen "grass"
: ?. Q/ _0 e: y6 r& { plot count patches with [pcolor = green]
; c% Y9 J% O& @3 J j, P9 ^2 S* [end7 ^) u& y" g. |7 ?& P* \( J- s
可是运行时提示no such plot: "Totals"
: Z6 j2 f3 K" V5 w: D* p9 yerror while observer running SET-CURRENT-PLOT% G# [9 i( }6 K
called by procedure DO-PLOTS% K* Q7 n' h& n* P
called by procedure SETUP
, W0 Q8 [: [0 P$ I) D called by 按钮 'setup', H5 ]/ E" a8 H R- N; e1 z
求大神解答啊 |