我编的程序如下turtles-own [energy]
6 Y% r0 k% F7 z- e# `to setup
; J- q, \# ^8 ]7 o clear-all7 }2 V7 v6 _ g1 g. [# E3 @" L
setup-patches
/ q* @# `5 \6 p% [ create-turtles 100! X2 Q0 P& y" x; p5 X
do-plots
# y2 ^5 d, t8 ]1 ^ ask turtles [ setxy random-xcor random-ycor ]
( ?5 i5 ]( Q8 L' iend
/ O2 {: G0 V6 z2 x* Sto go! b6 J9 S6 ]' ?8 A `) M# T1 q8 [
move-turtles
( L: d& q& k+ R F; W& ^$ L eat-grass: l5 `3 O5 k" i8 l
reproduce
* ]) E3 K' A; `5 Z9 A; T check-death
6 S- r% L1 B! K- U: y regrow-grass" Q6 m0 U5 H* i
do-plots4 e+ g! W [ j/ X& y: n9 z
end
' ^. C- a# Q7 D s: Yto move-turtles
9 q! s$ S' Z9 a8 v# a ask turtles [
0 A& H% x+ c) t) X9 U9 V& @% i9 G0 R right random 360
& t/ L' M& P2 k. C* e forward 1
8 G: r; ~+ } E3 D# q set energy energy - 1+ I( a, v; R& N/ p: Y x
]9 ]2 S& R9 Z D4 f; Z4 ?( O
end
1 d7 e" V/ I7 L% V' cto setup-patches& b, v3 k: ]3 }! R7 D; T* }
ask patches [ set pcolor green ] `+ u4 \# {1 i" f" J' m
end: a+ Q, F# y. S' S2 D
to setup-turtles4 {) U1 N* U( V+ e" x' n/ Q$ p
create-turtles 100
3 _, r8 q Q0 z$ R: l. c ask turtles [ setxy random-xcor random-ycor ] z2 D+ u3 \6 z
end, U2 Z4 j7 c! M, o- B
to eat-grass
2 W3 S& {$ F1 J' a ask turtles [
* u* @$ ]6 n; P& K& w' z6 M if pcolor = green [8 w" H2 _+ }8 X9 z. ]/ o9 ~
set pcolor black$ N0 h. X6 X0 C# O
set energy (energy + 10)
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- ]# H/ {5 Q4 s, ^ ifelse show-energy?
6 W0 j' m- o" d5 d) e g- G [ set label energy ]* c+ r' Q$ `( q D. q
[ set label "" ]! }) t0 s4 t7 y! o/ m
]
; n4 `- b0 [8 v! c! O& B9 wend
5 W% v9 Q3 e" S( c, @) {to reproduce) w* |. z% E, C9 l; T8 |+ K
ask turtles [
- S% J9 d- A# w+ K; \ if energy > 50 [, o3 ]) u4 _$ V( g" e/ [( A/ o9 e
set energy energy - 508 w$ \, Z/ n% F' @! }# v g" M
hatch 1 [ set energy 50 ]
( c c# K1 V, u0 U5 o' S) b& k ]" h1 s( Q$ U% D# x/ l; h
]7 P) w6 F8 S9 H& a0 J4 Y E z
end
, l' [ ^; R% `to check-death
+ U5 {( r" i/ x ask turtles [1 c2 c4 l) i& w& A8 u4 w
if energy <= 0 [ die ]
( I3 I; i. U1 ~) S* ^9 h* W: h1 y ]
1 u. b% l( ~3 D$ q) bend
j: X( R/ v5 @$ z. F o/ Z0 Yto regrow-grass, G J. b$ | W$ V) O
ask patches [
2 S3 R" e; H+ W9 `; \ if random 100 < 3 [ set pcolor green ]
" l3 K" A! w2 ^$ S0 D, F; q4 ` ]
0 W/ G" ]- Y; |( L; hend
/ |7 r4 B1 p0 I2 y. |+ rto do-plots( Y: O t0 j# T7 P; f- u5 d
set-current-plot "Totals"
2 H$ f0 C0 Q- e3 t! k set-current-plot-pen "turtles"0 z, f9 `4 j' h
plot count turtles
. K( d0 R, q3 Q) ~ W9 I3 G5 M set-current-plot-pen "grass"
; J0 I. L* |2 C3 i. } plot count patches with [pcolor = green]. C# ?8 k7 D, _1 C
end
' v. i9 `0 E0 k; u6 O" A. Q# w可是运行时提示no such plot: "Totals"4 c( J5 R/ _' {2 Z+ D) V6 s8 ]; F
error while observer running SET-CURRENT-PLOT
! l" v5 p- V+ y3 y called by procedure DO-PLOTS, i# Y; |. U3 F
called by procedure SETUP; L; p+ ^! A# I' ?+ `) M. F
called by 按钮 'setup'2 @+ x5 X' A5 w0 |! P+ o/ W8 B
求大神解答啊 |