我编的程序如下turtles-own [energy]6 \. f5 ?* _' J ^% t
to setup+ B# d1 s6 N {( m7 v
clear-all
- R4 t1 o; A9 w' [# ? setup-patches2 u: z- n* Y0 B
create-turtles 100
6 E2 h( [3 K( @4 Y/ s! F. z do-plots
6 Z( E& [' x8 T" n5 U# p! { ask turtles [ setxy random-xcor random-ycor ]
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to go
2 d' D, a0 ?) }7 U) t' @ move-turtles
' G8 H+ \6 r0 a. b* @3 l eat-grass
; K& f. j) P' M8 V3 i. Z reproduce9 \6 I3 c6 Z* @; V
check-death
# j7 P" `% v7 j6 v+ {+ N/ } regrow-grass
& |! `- l- Q$ t0 l+ Z; J do-plots2 [; x8 w( X- P& b
end
% v8 N/ ^( w/ j2 |& r- d6 zto move-turtles4 r7 `, q a6 F- J& X/ s
ask turtles [
4 z; |4 I3 P+ y right random 360$ K" y9 C& @7 m% x* S" M0 u
forward 1, o$ h+ d8 d) n( q+ c
set energy energy - 1
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( u' ?. h4 B& U6 Fend l! V$ a4 f1 Y6 c
to setup-patches- S- Q+ q5 ]4 W/ A7 l5 s
ask patches [ set pcolor green ]- i" `: B- \% T/ X& f
end
. R" y8 b" c6 A; j: j, lto setup-turtles
% Y3 T ]- b& j" L) ] create-turtles 100
! B8 `- M7 m; e/ Y- W! z ask turtles [ setxy random-xcor random-ycor ]
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to eat-grass( @) O* c$ J+ h c) h: y6 l& U
ask turtles [5 x$ ^. W/ @6 V5 T
if pcolor = green [+ V$ j! L$ g5 ~( Z
set pcolor black" z, F% m1 }8 o- X O( m$ c
set energy (energy + 10)7 Z7 Z) O& ^% {0 x9 T" b
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ifelse show-energy?
$ S1 @: w5 \3 Y! J9 e; T [ set label energy ]
0 Q. q6 m* j% E/ J$ u [ set label "" ]
/ X3 r6 j ~8 I2 A! n- F: L' R2 q ]
- b4 Y) s" n# v5 hend
~' {4 [: N) j. U& p* }/ E4 Mto reproduce/ U$ [+ F) j. u% f* }& ~
ask turtles [
J3 n: z' A4 j- K7 z, Z( {* l+ y if energy > 50 [
8 q! r2 Q) m* q1 U4 { set energy energy - 507 I" D/ Z$ g, n& ]7 d
hatch 1 [ set energy 50 ]; }, d) D: d! j
]
9 C1 T( b) i# |9 Z4 W* T: g! p ]+ t+ H, M) K8 {; V9 [
end# E# l5 n) ?- z i. l8 t' i
to check-death
2 W- p0 ?" D8 A: i1 _$ Y8 M& q3 z ask turtles [. G: c4 `5 ~% r# F5 j; W8 @
if energy <= 0 [ die ]
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end, s8 ~# W3 F7 ?) B! [2 d9 L
to regrow-grass) m7 Y4 i5 v7 I5 }$ a: o
ask patches [8 d: e/ `( C u1 T- y; A/ a
if random 100 < 3 [ set pcolor green ] p3 W0 j$ z3 }
]% [- x3 D7 q$ P. w9 u Q
end/ T" o' e {/ Y0 Y: o- D% g
to do-plots
2 X* G, M- _; w- `/ G set-current-plot "Totals"0 n8 @! w2 ~; j: F8 n$ n
set-current-plot-pen "turtles"
^$ z. m+ @, s2 E) Z/ s plot count turtles3 J/ u7 q. k8 F& T) G8 C) v
set-current-plot-pen "grass"
; Y/ U+ b6 Q8 X a8 a3 s plot count patches with [pcolor = green]
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可是运行时提示no such plot: "Totals"3 ^4 n5 Y. v( X( l* X
error while observer running SET-CURRENT-PLOT
( \& \' K2 |0 {1 { called by procedure DO-PLOTS
6 q& y5 T) p; Q, k1 L/ l called by procedure SETUP
' i* `! z: [6 }% A called by 按钮 'setup'
( D3 m- L) j6 ^; N求大神解答啊 |