我编的程序如下turtles-own [energy]% T; P9 ]" Z7 _9 ]) T; g% K
to setup1 a/ \( n; `' T1 n1 x+ @
clear-all
9 q7 h' ^0 R) m: G% {6 q setup-patches3 R" x( G3 J" c3 G% P1 i
create-turtles 100
F8 b7 B7 \! b do-plots
7 v6 B: A) ^6 U9 W: [+ M1 O ask turtles [ setxy random-xcor random-ycor ]
% \( C- X4 g- x2 f9 Gend
; V ?% w: l( @( C2 Yto go+ H4 u8 n( y. _1 r( g' X6 v# w
move-turtles
/ B$ F$ U5 b4 ]+ P5 z1 [: U eat-grass5 o1 Y9 [ A4 ?# j
reproduce+ Z b0 I/ p) n& B- E% ?0 h
check-death+ j9 \0 u+ J% U) o- _7 n
regrow-grass: s( V; s2 N8 F2 b* J
do-plots; c* x9 x: m( V+ I
end
- Q/ J4 S" C9 b/ wto move-turtles
; @6 G- _3 _1 z* b' H+ _6 X ask turtles [
, C* d% D' X& D# ^; _0 X right random 360
4 i$ v# O' H& h) C) y P forward 1
* o( P' a5 ^( ?7 z3 D: D set energy energy - 1- z+ R: k( Q; i- T+ C" H0 b- f
]
3 [4 v6 O) G* xend0 M0 k& }9 i7 y; J b
to setup-patches
( I; q4 d# n8 T5 F( K m/ Z ask patches [ set pcolor green ]2 Z4 U- q( ?* M! P6 t* m* S
end
1 E. ~9 e! E* ?2 Z" T8 Mto setup-turtles
5 n0 w4 p; t( o. z3 L! @ create-turtles 100
/ r( a4 g: |5 b( I2 Z9 b ask turtles [ setxy random-xcor random-ycor ]
, ^" {, _; B2 L7 i; ~# o) yend
* P0 m* S8 k& t6 k: X+ S* S- }to eat-grass& a; l! G; r3 l+ a/ J- S1 F
ask turtles [. E; X( F: v9 n6 K0 d
if pcolor = green [
$ N/ o/ K2 J* _" ] set pcolor black9 h+ i1 R" w' c
set energy (energy + 10)
1 v S6 `* R4 p6 W" e ]6 |) M g4 Y8 Y' w
ifelse show-energy?0 o& v; W6 s4 k" q
[ set label energy ]+ V( J) T, k8 p- ~: r
[ set label "" ]- ~( Y5 s% K6 O6 W5 u
]
: C& z1 d# Y( ~$ \* Kend
+ T. k' h$ e* @* I. fto reproduce
! x% r4 w& Q1 K ask turtles [
* p9 V$ Z. ^7 x# O7 }1 S if energy > 50 [
4 C: o0 d( ^0 I, w set energy energy - 50& [( I! B' P6 u% P' I% h: c; l+ n
hatch 1 [ set energy 50 ]* Z7 G# u7 |) M
]+ ~# V* @$ n d: W
]
* b! |9 b+ {* |2 s0 ~% M. \4 Q9 T8 Z1 fend7 j2 c0 ~/ {" r3 H9 }7 e4 Q
to check-death: E, z; N$ U) `) H. b
ask turtles [
/ K! S% h2 s6 v/ k: X2 ` if energy <= 0 [ die ]
/ N$ c2 D/ }9 e- h, {3 q+ r" k% { ]
2 \9 Q# @7 m! H8 }' X' R. jend/ o6 C+ P4 `4 D5 n% U0 y
to regrow-grass
8 ?2 Z# s% a! X% d: V6 Y2 v ask patches [
]- N* u4 H, [' i) U1 G; E if random 100 < 3 [ set pcolor green ]+ q( w; P, Z+ p ~/ d
]
& @. f8 w# {: ]7 a6 r j/ V+ _end
, k: K$ {" A" g, v8 Fto do-plots
# Z( H" u* g5 V1 ` set-current-plot "Totals"
$ q; X+ m j2 ~* k% A6 Q set-current-plot-pen "turtles"
+ D U% O$ Q# ?6 { plot count turtles _' z9 n/ N+ G
set-current-plot-pen "grass"
( `( M5 x$ m! W) d plot count patches with [pcolor = green]
8 }1 r+ e' U( Y4 I Y% [end( m& I* T' _ }- W
可是运行时提示no such plot: "Totals"- Q/ m' _6 y2 j# V* E# \
error while observer running SET-CURRENT-PLOT9 z; H, U: }' ]1 v
called by procedure DO-PLOTS3 J: @9 f, ?& I* F* V
called by procedure SETUP4 K" d' l1 Y# w' e( X
called by 按钮 'setup'9 `! m% h+ d5 U d8 ]
求大神解答啊 |