我编的程序如下turtles-own [energy]
4 U* Q& q7 _0 z% z, Sto setup; h4 t8 Q2 U: k) X& X
clear-all1 z0 ^7 A1 B8 L7 a+ D
setup-patches
4 p; W9 F& D! x" |9 C9 r' [4 ~' q create-turtles 100( e8 q( D Z) G+ M% P
do-plots& K; C0 O- x# v+ s* P
ask turtles [ setxy random-xcor random-ycor ]
6 ~% k, _: j" w/ O3 r3 b- i) O- r$ send
% O- [! X5 C3 U s* r2 r+ \$ hto go
: Q- b% r+ x+ [5 ^) l* }3 ?& g move-turtles+ ?* c* g1 i5 I9 W
eat-grass
: K9 @6 ?2 E& ~7 a2 I4 J7 _0 C reproduce( P) e# _- E6 x- [8 p2 Q: ^
check-death
3 P" a! o; ?- M4 C" T2 J: o regrow-grass! G# `( @; J' B8 |
do-plots
. W% Z4 l+ L, W6 aend
; V: {! L/ k5 G/ ]0 J) T1 tto move-turtles
; M9 X! F: i, w1 n4 ~& ` ask turtles [; t( N6 |) x$ H1 s
right random 360) G6 e+ k& b: B. a
forward 1
( J6 { ~( ]. \! K6 x set energy energy - 14 O! S% V+ I! [) S
]& \7 ^; u5 L3 S
end6 \9 G' b/ ]& I9 g2 X
to setup-patches7 W5 K2 Z6 K8 _' j: V9 V8 i; H. d
ask patches [ set pcolor green ]
( U L9 v4 f* |$ ]" W! R) g$ _end( k6 c1 |& A% `% h8 l% e
to setup-turtles
4 d1 a- G" F) L6 \6 j: y create-turtles 100
' Y2 ?7 k# A+ l5 B1 t P( g& r ask turtles [ setxy random-xcor random-ycor ], ^' B9 w6 c4 b1 I( f
end
0 a' f8 \9 q) X2 v7 E; wto eat-grass
3 D) d8 j% _ l5 \7 J! d* Z ask turtles [
1 a5 f$ i" Y4 w* l9 I if pcolor = green [! w* ]9 r8 I+ }& y$ e
set pcolor black
& K; L8 G6 {' c) G) W r set energy (energy + 10)1 ]! ]; l+ h( l5 C0 y- w
]3 L6 C4 A, b) U) I; Q5 t
ifelse show-energy?1 q: u) w5 h& t
[ set label energy ]
& k7 T' y) m* C [ set label "" ]0 x# C2 f) K: h+ j5 v3 ?
]
0 ?% \/ B+ n1 Q& T7 B0 z& oend2 y. T% ^/ v5 Q5 o( w& `2 _) m
to reproduce( ^# b; ?( B* ~3 D9 |6 I* c9 s9 ~
ask turtles [
0 Z+ c; D4 [6 `' Q if energy > 50 [
# m0 R* Q# A r) D8 I0 Z set energy energy - 50
2 Q$ q* m* e- e: v% g0 g. o hatch 1 [ set energy 50 ]
( V4 \ \% M7 ` ]1 J! @$ C& g: e- n; n
]
3 q/ ^; n2 y9 L2 a- Qend, q J5 x8 W: k+ P. H
to check-death
+ `. x5 g& h/ b ask turtles [- N& b. h3 c. C+ M) {) t7 _% t! @
if energy <= 0 [ die ]5 O5 ]/ _' ^5 ]) ~+ d$ j
]% H* ]+ f# l5 Z% s/ L2 Q' ]$ P% l$ L
end
* J2 R" h$ J/ r% C5 G3 s" X1 oto regrow-grass
$ C; Z5 r3 B- H ask patches [; b' |! F9 I- b2 J x6 o" x- b
if random 100 < 3 [ set pcolor green ]# K& Y! O2 d5 ~
]$ k7 j- G/ v( @# Q; v @5 n
end
8 R% n. ~5 p5 x _% G) Nto do-plots( a# u) l' b, T3 j
set-current-plot "Totals"3 s0 {3 c& H8 R w0 j5 j. O
set-current-plot-pen "turtles"* j- m9 O/ ?8 v% u1 S, H' Y. O; C
plot count turtles
& ^6 r! U1 d" N' N- n4 G: A set-current-plot-pen "grass"
* A8 r8 N9 s; ~" A plot count patches with [pcolor = green]
4 x4 W" s4 ~1 } c% tend9 j3 |+ w2 a' i( D0 z0 s
可是运行时提示no such plot: "Totals"0 a9 B* @3 d% C6 C, E, U
error while observer running SET-CURRENT-PLOT$ K5 J& u" [& z, x. y
called by procedure DO-PLOTS' v5 P1 H9 X+ j, @: e; p, S$ |0 x
called by procedure SETUP. u5 S0 i6 U1 B8 \
called by 按钮 'setup'& M0 I! I: U8 o" _
求大神解答啊 |