我编的程序如下turtles-own [energy]
4 T( l0 y* q7 S1 lto setup
8 ~+ W1 j- S* b6 S7 K7 N/ w clear-all
; U$ P' ?; k- H' Q setup-patches
; r: e( W- s* j* ~$ K/ S9 B& R$ R4 V create-turtles 100' H+ {* j0 M/ R! U, c
do-plots
% M1 V1 u# P6 K: m+ ~ ask turtles [ setxy random-xcor random-ycor ]# X- }& m' Z! S
end
( l4 S. {' X( W, Yto go( ?8 C7 K' K' a9 i3 E2 S
move-turtles
+ c: y! Z+ P9 Y2 a9 @/ V eat-grass
- h% v% X7 O& z7 v; j reproduce
# }2 m/ g! s& ~5 P8 [' I1 |( c r check-death
5 r. j9 j0 d! J; r, u' r. A regrow-grass
9 s7 A2 V9 p( @" ]8 V% N$ @ do-plots
7 @$ q& O2 ? m5 V9 o: l( Tend
3 v) y' w7 {. W) M* e3 Oto move-turtles: O9 w/ z: G* U# O) y( D5 O
ask turtles [
& W2 N v j& U+ F2 { right random 360
2 q4 h |& n" @; n forward 1' ~" `" T" l. R. G) u+ Z
set energy energy - 1
0 j+ U! c' K, L ?8 l* j ]. K6 |# ]5 L7 b* I
end* P9 I; N) K- p. H
to setup-patches2 z" p' |4 M5 i6 H6 J s* \
ask patches [ set pcolor green ]+ o6 @3 s; A& e4 V6 O8 S
end/ F3 h* u' m' z, @
to setup-turtles l5 X, E) A$ Z. S
create-turtles 100
5 v/ ?/ ^- l! ]0 K' K. a; d ask turtles [ setxy random-xcor random-ycor ]
& x4 J1 N4 R% g0 Q0 \end* T0 d% S2 G5 U* Z" e8 o* I/ ~
to eat-grass- ^, K8 {( l+ D2 u
ask turtles [
) _$ L% t4 j+ x7 r- Y8 I6 d) z if pcolor = green [8 O! S# J" _4 J' b2 t( n
set pcolor black' ]2 E; C2 ^2 S- m3 S+ t
set energy (energy + 10)( x6 \: Q3 G3 z; @( _+ D
]! Y( ]1 |/ K: j! C
ifelse show-energy?
, Y q; p" q: P" o. N+ u+ i' l [ set label energy ]
! R, Q* q K% p. U# ^( q. a9 { [ set label "" ]( Z% \7 q0 P0 e. J/ d9 h
]
0 l# M* H/ m# O- Send& D7 ~9 C4 H( ^3 o; c* }
to reproduce* \" j4 ^; [; c2 R, l
ask turtles [
$ p- ~( p+ g ^) J* u; v g0 H if energy > 50 [
0 a& s! P5 Z& `+ |, | set energy energy - 50& I; S: G# @& M9 x! o, p
hatch 1 [ set energy 50 ]7 x6 Z1 I7 d, U
]
' U0 d: {0 ^9 D2 F1 j5 V2 a2 {8 E ]! J( o) z) d7 m) i8 z
end9 v5 I! `( ]0 u5 c- [
to check-death: Z* w M* M' T7 k4 ?
ask turtles [" N: h* k0 H. c- F+ Y5 d
if energy <= 0 [ die ]
+ f X2 E0 G7 R+ a6 P9 |7 t: [( c ]6 N' @: {' f2 @
end
# {, {) w- I5 r$ Q1 V4 n5 Yto regrow-grass. Y" P6 }9 e5 W! S+ e6 Z$ Y# ?4 @
ask patches [
0 M1 }0 ?/ m C; a {8 \ if random 100 < 3 [ set pcolor green ]6 G# ^9 S% b* x" r3 E% \ v R
]
; {/ x0 A% ^3 d: tend
/ D$ F8 s8 W0 c2 \3 Bto do-plots
N8 c! {5 W$ @6 l9 A set-current-plot "Totals"
3 `. s% s" v4 F9 c/ W5 \! i set-current-plot-pen "turtles"
- y# T& W& W; C( G" L2 J6 Q plot count turtles
& m* d3 Q% k! M( G& ~2 {' A set-current-plot-pen "grass"
. T$ w4 E$ ?) e3 B% z0 P- g- n3 K% s5 E plot count patches with [pcolor = green]2 Q* @# J- @7 z
end
) q ^5 O/ c3 j9 Y( G' `可是运行时提示no such plot: "Totals"
5 L! m* J/ E/ V! Y, merror while observer running SET-CURRENT-PLOT
6 Y' p( h; Z0 M! O* s* b, A7 C called by procedure DO-PLOTS
1 r: S6 ~, i X( Z( u, o called by procedure SETUP
2 B8 a4 ^ O1 B; D called by 按钮 'setup'* y# T1 U }4 v4 C* v5 y' c
求大神解答啊 |