我编的程序如下turtles-own [energy]! Y& ?2 t6 z5 D1 t: t& i% x
to setup3 w7 `$ b% f! ~6 H7 r; Q2 _
clear-all, w; c3 ?# S6 S- L
setup-patches
( J7 V% j6 ?+ l create-turtles 100# z: H' W$ q3 m3 A( h
do-plots
2 g. Q0 m, ^7 o3 f0 ` ask turtles [ setxy random-xcor random-ycor ]
, R. a7 q4 R' p6 P/ L. Oend' P2 Q$ E0 o+ x/ J3 X# Z
to go8 b" j+ z5 K; A6 t/ p; \, m7 r
move-turtles
' t X! @6 X4 x( c eat-grass8 N5 }; f7 f3 n; C9 J7 ?
reproduce7 y- e+ T1 `" J" C* a
check-death
5 G1 G* m+ T; G regrow-grass7 k: M# O4 }3 H- q; ^& A0 s
do-plots) C E- B8 U* w" L+ S+ ?
end. p/ S' t0 D' x' I7 O7 o5 A2 D
to move-turtles
& G2 n# [2 \( H- }" h) I% _/ X ask turtles [! |5 E! s7 \5 q& g# Z+ R; n" g
right random 360/ l7 [! I" |# L- a
forward 1
7 S4 U' f3 f4 B3 z+ w set energy energy - 1 Y" |* N8 ` ~
]% K: N0 U1 f+ |2 j- m
end7 ?% N t0 o& X1 \( N, h
to setup-patches
- W8 M! f) X {4 j+ X6 U$ i' ]! M ask patches [ set pcolor green ]
2 {1 @9 ?% G7 l$ X/ S# }- q/ @; G' Cend/ j' T0 P5 b0 p9 K; ~
to setup-turtles
2 ]$ Y+ T9 ]+ c3 H: \ create-turtles 100) c7 v3 w; f8 w1 ^% ]# ~8 E) W
ask turtles [ setxy random-xcor random-ycor ]- {% \- R: x7 @9 t
end0 a+ v5 N3 T/ e: b' ~
to eat-grass5 f7 w3 L+ O) n: @
ask turtles [
7 |- T# S2 P5 U9 Y8 [8 r" _ if pcolor = green [
5 @+ _% F2 ~$ v set pcolor black2 @4 d: r2 k0 h! v& A
set energy (energy + 10)4 K& Z S& q. {. V$ x
]
9 T3 `: z% G. b: y: R8 H' L ifelse show-energy?
6 C9 r+ V# ?% c" o1 }- I [ set label energy ]
, K! R+ v- W6 P/ T. k [ set label "" ]( g2 y' V& A! g8 E
]
6 s5 X! [5 F- n" _' t. E) R- P* S% g& Y7 [end
5 q, s0 d" }3 M6 X: |& P4 sto reproduce, q" {3 n% I6 J. l: a) a- y& z
ask turtles [0 Y/ f% e0 s6 E5 Z& {/ c
if energy > 50 [/ W% v+ M4 c% X$ {4 U
set energy energy - 50# k" c2 [4 K0 J- N2 g4 m
hatch 1 [ set energy 50 ]1 R3 L' p, F$ B: T
]' W1 _0 T# e5 L2 \! ~. Z9 G7 w
]
- F: T. C6 R1 o, rend
+ @% N: Q2 r* [to check-death& _/ B3 I7 O; J& g+ M
ask turtles [) W5 T$ x4 J- w
if energy <= 0 [ die ]
4 O! ^" u( }9 J1 N- O8 B% k( M: E ]
3 a; u/ j; s1 u6 b/ ]0 wend7 P+ R' W2 r+ E1 |/ j5 ~
to regrow-grass# j8 p; y* M7 g! I A$ F! c0 I+ Y
ask patches [
, N8 q! z# A1 ]+ w4 M) _( T if random 100 < 3 [ set pcolor green ]; ^2 f) ]0 M: t
]8 U+ o% @3 [' H$ y7 L# t9 a" Q% Q
end+ u5 j% ]% l, V! w8 h& j; a
to do-plots
+ n8 v0 s! q' x' e( I set-current-plot "Totals"
2 o2 s% h& M! Z7 [ set-current-plot-pen "turtles"
: W2 F& S% b& E: P, Y1 r6 |# Z plot count turtles t1 A" t4 P6 y1 S' m+ q
set-current-plot-pen "grass"3 b8 S2 X0 I- N$ Y- |/ D
plot count patches with [pcolor = green]: J- d3 u3 f! Y4 l0 ^1 ^
end
3 t$ A" Y# T0 E9 h6 Z& F$ r可是运行时提示no such plot: "Totals"
, A9 n- Y' O$ p3 r8 p; Lerror while observer running SET-CURRENT-PLOT" i3 |0 N6 ~2 \# o& q
called by procedure DO-PLOTS
" l7 ]5 t8 Q4 I; L/ G9 G. u" _ called by procedure SETUP
: n2 U" @& }8 p4 N8 Y2 B8 z called by 按钮 'setup'
3 L9 K: o/ M8 [求大神解答啊 |