我编的程序如下turtles-own [energy]" [& {, l7 E0 _; f% z( h1 B$ l
to setup
$ [7 P% M7 P" c$ s3 _ clear-all; K q# }1 s( D2 F& W5 n
setup-patches
( ?$ W1 V& h% r$ p9 U1 G# @: D# q, s create-turtles 100
7 U+ M* @+ y4 t7 }( F9 b6 ~0 C do-plots
8 A }# m: W8 _' r: G) r ask turtles [ setxy random-xcor random-ycor ]
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to go
9 ~# L" ~ p c2 X; \8 k move-turtles
/ H' ~4 c' Q* w% z eat-grass
$ o+ M+ y N* q' G# U- w0 N% q reproduce
" U$ p" o, F0 F/ {' f check-death
; ?4 w0 k# b2 g- ?+ e# S8 T5 O regrow-grass8 h3 i9 y) w5 `
do-plots8 A8 E4 }. F0 B0 e5 r
end; ?7 M4 N6 X# U; h
to move-turtles& {4 q. |: A- [+ I1 } A) w
ask turtles [! O& [6 H" |# v- b
right random 360
( g. G: \% T! H& A forward 1" {2 M F+ V" N2 L H' j- G. n
set energy energy - 1
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end4 {# l( h& X8 i2 }# p" \
to setup-patches
' b% Q* U; {# x8 W' ^2 k ask patches [ set pcolor green ]( h+ g7 K8 S; m [9 j k
end! c& C" k, O, j8 T. D0 F) _
to setup-turtles- I" d- r6 o9 y7 k* f# z
create-turtles 100* A# m& J" E. v( v
ask turtles [ setxy random-xcor random-ycor ]
i6 ]5 h. J4 q' W# a9 y1 Rend K% b1 x# W! J- p5 j
to eat-grass7 @2 O/ `! x" V$ h1 S. s) A
ask turtles [
4 G& S9 E. ]3 X( n P* N if pcolor = green [0 z1 `+ L7 p; h: z" P8 n# N: F
set pcolor black$ }/ t( _* i% G! n; A
set energy (energy + 10)( }! L/ l) M" y; H
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ifelse show-energy?- x. q$ b/ N6 M j$ M2 V/ R E
[ set label energy ]
# K/ c5 j& g& b6 Y; c [ set label "" ]" K3 C" g/ b" [' @, a
]& L, c4 y0 @* z
end8 K1 u4 r+ q8 \8 \+ K1 w0 m
to reproduce
" F$ S; k7 \( n ask turtles [
0 l. Z2 `" l; l5 S if energy > 50 [
; W' G G- I% X- X# G set energy energy - 50, i H, Q- b" X2 T
hatch 1 [ set energy 50 ]' Y' v! u# I- d% x
]
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end
, w/ h/ t+ v( e. C" Pto check-death. O5 n) K5 }: ?: T. [% `! J6 W
ask turtles [9 c' G: w3 G; Q0 I/ j, w& w! t) v
if energy <= 0 [ die ]
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end3 P, r3 w9 r) T; W
to regrow-grass, f4 l/ g2 Q! d, A5 b2 q
ask patches [
, [! ?" ^! X$ d. A if random 100 < 3 [ set pcolor green ]
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end
- d7 B5 g* c2 K: z2 c+ K) r- z9 Ato do-plots
, W2 Q) ]6 L I* E" _0 Z5 t set-current-plot "Totals"1 A# V5 q6 I$ t
set-current-plot-pen "turtles": k) n0 e; ^# t
plot count turtles2 l( Z) o+ u$ h% b- n/ f; }
set-current-plot-pen "grass"7 g: I0 Z% d% |. U
plot count patches with [pcolor = green]+ b% i3 g/ P8 R1 Z# t9 [& D# d
end2 \5 i: M9 [0 Y4 z! B7 l
可是运行时提示no such plot: "Totals". T$ K4 W. K: i% K
error while observer running SET-CURRENT-PLOT4 E3 o/ S% _" j9 J5 j$ q1 i
called by procedure DO-PLOTS
6 o8 `1 u5 _, H: { called by procedure SETUP
! u' K8 s0 m$ E7 F! o called by 按钮 'setup'( I) `9 E" o( r$ u$ z
求大神解答啊 |