我编的程序如下turtles-own [energy]% t/ u# G/ d, L: B$ G# Z+ G
to setup
3 G- k- C0 {+ B: v0 P0 x clear-all/ j b) ~ l8 G* Q, M% `
setup-patches# C7 B5 R* ~6 K k/ o2 ]) c$ s2 O
create-turtles 100
3 Y# I' D# x" s0 V% O3 ] do-plots* i( u. E( N* k* w$ l
ask turtles [ setxy random-xcor random-ycor ]9 |- V4 G1 w9 e. \- K
end
' T* q2 y: H% Z6 E& X3 w% n* {to go) O6 \" `/ _9 }- T: t+ k
move-turtles
# H5 Z( U0 J7 g. W6 L* r+ t eat-grass
# _8 q$ T- e, I; ~ reproduce
6 E3 X8 B" H& Z0 m check-death& I% E* D- ]4 u, Y+ [ P
regrow-grass
, O2 s; l @8 {' T* A8 P- q do-plots
8 T9 y8 e |. ?' y" ]8 ~end
4 [7 S' Y. r: J- Y9 }to move-turtles
/ p0 x2 w4 p4 A7 z, n$ j ask turtles [) @" g% N5 M; T" a3 Y( m& w% z6 d- U
right random 360
2 T2 x9 S5 A) l; p forward 1
# A/ U5 {1 u5 u- `4 t k3 C3 R set energy energy - 1& q( @9 j; Z( c( }8 J( F
]
4 J" P4 b6 |; d g' pend
7 k" ]# T5 q" ~2 r7 Y: s$ z% S: Fto setup-patches
# J( I! f8 G ~+ A: W ask patches [ set pcolor green ]
2 o2 w: y' O+ B- xend
1 v3 W# J @0 _to setup-turtles! t4 [ A. J5 l" }" p" K
create-turtles 1009 q. z: q* [! k
ask turtles [ setxy random-xcor random-ycor ]
2 f# B4 q. o: q# |end# R9 S/ f6 [6 {; V2 h) w
to eat-grass
) G9 o- W7 Q- O* L/ A7 s# ]( B3 r ask turtles [
/ I/ q, w* ?7 ]0 A if pcolor = green [
4 O: a& W- H! F& R! | set pcolor black
: c: E% j* H: }% W( H, M set energy (energy + 10)
. F3 R( x- s+ K* E0 v1 M ]
! j2 V9 |( Y3 I2 I- X) T ifelse show-energy?9 z# N. g* o7 ^( t* ]
[ set label energy ]
. J6 {5 B. @! j, N+ ~# Y9 T [ set label "" ]
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end
: w3 z7 ?' p: P8 P* Cto reproduce
! ]) {: e' m5 n% E ask turtles [
, ^, M8 ?" u E% C0 U, E if energy > 50 [8 o0 s- y$ G: @8 E
set energy energy - 505 _7 w7 ~) w8 x1 ?( e1 w
hatch 1 [ set energy 50 ]
. @4 H2 r. Z9 e0 T3 A ]
, T& V8 A" e2 v9 {2 f8 y ]0 O6 a2 }/ M" q2 _% |/ {
end
5 |) {7 _2 P1 T1 j1 dto check-death
3 h3 D; k/ ^ f& }( b ask turtles [) R1 a. c5 l1 _2 [8 H
if energy <= 0 [ die ]0 T+ m& L1 J$ W+ s8 B, r
]
- w+ d4 B- Z4 bend' K# X$ g# u6 i n: ?$ _. v
to regrow-grass
9 w1 f$ n" V6 |2 d6 s8 d% L ask patches [) K Q) V% G% J/ N" k! W9 y
if random 100 < 3 [ set pcolor green ]; U* O% M; Z8 |, x. W
]
7 V$ W9 R; O2 L4 r% I" L! a( Tend
" k* |- x6 _% G, {1 |# J" eto do-plots
~& {- c2 N5 Y1 S0 r set-current-plot "Totals"" `! q9 W. w+ T
set-current-plot-pen "turtles"
/ s& V* x* p$ x8 @/ F( @! Y: A plot count turtles
K# N+ f$ c' L& `6 I set-current-plot-pen "grass". q# u; i6 e8 Z$ H8 N3 {
plot count patches with [pcolor = green]
# X8 w! B% k' C; v$ N0 t& lend
% A1 E0 z1 H/ |; B3 D9 y7 ~( T* ]( E0 F7 F可是运行时提示no such plot: "Totals"
8 C* _3 p- c& Z# O8 Werror while observer running SET-CURRENT-PLOT9 |2 E4 N/ s& r; n9 j
called by procedure DO-PLOTS' Y7 s+ z u4 A# h5 n. W% O* ?/ Y
called by procedure SETUP
& {8 b Q) Y* @7 b( t$ K4 ~8 n called by 按钮 'setup'' F, {' B; X9 [5 p: F6 v3 @
求大神解答啊 |