我编的程序如下turtles-own [energy]& O/ {' w& j( h i( {& ?2 S' K
to setup
' `( u2 F/ D0 a" V7 E9 ~ clear-all
+ U. @" }, `& O setup-patches
. ]# k6 b+ O% L" @2 `1 Z create-turtles 100. x$ i! k9 t- s& H% Q$ a4 w
do-plots
$ N$ U. n: X( ?- b& N8 ? ask turtles [ setxy random-xcor random-ycor ]
; L+ b: G6 m, c- i$ Hend
! y3 _6 l% K, j6 ?2 _7 lto go
! x! I J( b) T3 @6 W+ M ~ move-turtles
! B7 w% A) {9 m- e; Z |6 k5 J eat-grass0 g- T, e) f" ]: O [& u% E; z
reproduce
! D, q+ e+ S+ X$ q1 C. U8 X check-death
/ P- ?8 D3 [! u8 d" D% G regrow-grass. @) L6 `; @+ ?0 ?/ g5 Y+ R# J
do-plots
0 X% q5 {' C0 b3 _- jend
& l$ e5 u# J/ r5 l, Jto move-turtles
6 ~/ O+ F# `8 |) X. O ask turtles [
+ W( j) s) ~, j9 o# J right random 3601 d0 v0 d) c5 m* U
forward 1 D3 g/ J0 P y; P. D
set energy energy - 1) c) a4 C. w$ g8 T) F
]: ^" R8 U1 J# m
end
1 l/ M/ p9 D) y! N* Dto setup-patches
5 H P/ J3 e5 J7 T' D! t" A ask patches [ set pcolor green ]9 [2 H0 S1 @! @' h
end8 i. k8 ]% S, k4 p( _
to setup-turtles% q' c) W$ o# j& U8 T1 g+ S. ~
create-turtles 100* _. |4 A$ q8 j- ^& N
ask turtles [ setxy random-xcor random-ycor ]+ l9 R6 \. [* i1 N4 C
end9 T; L$ [: j! Y
to eat-grass* s3 a! K; E' P) ]1 M3 I2 c
ask turtles [
5 G' e/ D' x' G- |1 Q7 F6 _9 |8 L if pcolor = green [
$ G# g% O( `" e+ ^# {2 t6 y set pcolor black; t- i# e( z. [* @
set energy (energy + 10)' {4 P$ Y& F+ N) q4 \; e1 o: }
]
: B) p( Z5 \. N- W- @- \8 H ifelse show-energy?( H: D: }. E' X( Q1 z1 u. B0 I
[ set label energy ]
7 J7 _/ X3 n' K2 C7 Q [ set label "" ]( z) U9 g- l" e% n. y1 [* v$ f
]
; u. K- I) u. E; F; s0 |( Fend
3 a$ z4 U1 f3 d6 K, ?to reproduce
# y5 ?+ R+ `/ m# }9 H, m, l+ T ask turtles [* z# l7 K- O# a+ b
if energy > 50 [6 z. h# d+ g; }/ c$ }% t
set energy energy - 50
' z# ]) s: {/ R& B( Z hatch 1 [ set energy 50 ]/ v: b1 T9 U, {- G; x/ t# D
]
( j- M* F* g8 K4 `0 z% S9 i+ m ]
0 k* q) v B/ O; e+ w9 c4 f9 w6 Uend. Q+ `8 }( l5 \! C; e* d( R
to check-death4 J. g1 N- B+ N9 l- k3 A
ask turtles [3 N2 F( _3 G# k) j- j: V
if energy <= 0 [ die ] Z# s& P3 }+ u3 }
]3 Z& [. O; b- w) h) X
end
& P: b4 M: s4 x8 l$ p! A2 oto regrow-grass
. {' T. {1 G) V* i" m* R8 x/ b- e ask patches [
3 g: v9 a! I+ y K: d1 |7 v if random 100 < 3 [ set pcolor green ]
7 n" p5 c2 x- ?- h( o+ c1 | ]
: e3 a& b4 |6 uend
5 L, o- `5 J: h8 `4 ]to do-plots& [; O% Z% \ j! ~$ f# _
set-current-plot "Totals"
( L y! A: J( P set-current-plot-pen "turtles"( w/ l) L5 K' n E; G
plot count turtles5 W0 T# l9 ~7 C$ |
set-current-plot-pen "grass"
" m9 d2 O: c' l4 x& Y+ U2 L/ f plot count patches with [pcolor = green]
* m: F4 E! K% i; o; S) w) ^( Iend
; y) O& G* U- j6 b0 b! t6 r) h可是运行时提示no such plot: "Totals"
' k2 y: v* X; v% D( J: |" Derror while observer running SET-CURRENT-PLOT6 X- v! Z% [6 C3 v5 ? Y, j- Y
called by procedure DO-PLOTS$ V( O- p0 k6 D' P. ^: m
called by procedure SETUP
( g6 V1 t; u8 p0 T4 V# L called by 按钮 'setup'5 e& g. R& J& I5 ~( O
求大神解答啊 |