我编的程序如下turtles-own [energy]% B0 P' u9 A p! f0 \& K
to setup
6 K& l1 {0 l' ] clear-all1 H t7 [' I4 |0 m5 }
setup-patches
% x6 w3 n" ?7 F" a! f7 S# Z create-turtles 100
4 K5 l: }4 t* H do-plots
0 p2 j6 W* P4 e+ I ask turtles [ setxy random-xcor random-ycor ]" n, L' v4 q; |5 h. q
end
4 R. V$ e q4 hto go
( p( G% g9 Y$ w- w move-turtles
E4 h5 k! F. P% } h eat-grass
2 K3 z7 [ R, y* [8 _9 \4 W reproduce
- k$ U- I# M7 @ check-death
: g! b6 T" ?, K4 K$ }* o! o regrow-grass% l- l! c2 d/ n; ~
do-plots
5 ^; j- ?* I; R4 R& ^8 @( G- o2 I$ _" aend: X: g4 J. a0 T! `7 l) t
to move-turtles" y7 Z, e5 S+ z8 X& {1 _
ask turtles [* l) s9 U+ F1 y
right random 360. w5 a- C$ f* u& }8 l
forward 17 E) h5 e7 E; J- l" \$ {
set energy energy - 1( \7 K# u7 m m1 F
]9 L# k3 q- v- o L* o0 e
end/ Q" h+ c- t- Z/ ?( L r `
to setup-patches
4 z/ M7 L0 M+ P ask patches [ set pcolor green ]
6 @* B5 d6 V2 X2 `9 i. @+ p: Jend. B! H' T& E+ H3 S8 a: z
to setup-turtles
' f2 a; P: [. D% e2 H6 s' U create-turtles 100
- M9 b5 O, p: U/ `. K/ @3 ? ask turtles [ setxy random-xcor random-ycor ]& _4 u! z9 u9 V* E* w+ Z, C9 G
end
: {* s; W. u1 h- q: }to eat-grass. }. ~$ J% x' @. o5 j6 }
ask turtles [& z9 e- l+ Q- c* h/ ]! u
if pcolor = green [1 S3 x. L1 X3 K& y6 R4 R
set pcolor black
& L6 W# e) W, ~4 A4 n set energy (energy + 10)
3 Z6 }$ ~! }) [8 l/ N: ^4 C# _ ]4 G, {# m( h" V k
ifelse show-energy?
( q1 w, `, s- R: I/ w& L [ set label energy ]# q3 i( Q! G6 o4 |
[ set label "" ]0 U6 O; X# B2 L9 t5 Z5 j
]
: U" v1 v" m# k: yend4 |2 `" ?+ x) i$ x+ p) L
to reproduce
1 A% _8 T, l' Q1 @! U9 Q1 V ask turtles [0 f8 b2 r% W$ ^( ^2 b
if energy > 50 [
) a, G, k% j( a; U" P9 K- b$ C" { set energy energy - 500 K" I" h$ v& a
hatch 1 [ set energy 50 ]
3 q" A4 ]4 L! o& i$ G5 k ]
& u, S9 O' }$ n ]
2 Q4 O3 y, T: H C) eend
9 J* K9 ?4 u' h) Y# [) z2 Q$ xto check-death" n% `+ m! {, C0 G4 X7 v3 P
ask turtles [
* d, j. `' j( q if energy <= 0 [ die ]) `0 l9 \* X X1 k- a
]9 J$ B( h" ~: w5 v2 F; W
end
" O2 {' k5 s: X5 G) Bto regrow-grass! T0 _& \, \, V" Z0 ~
ask patches [
; u: }3 R! u0 V( [ if random 100 < 3 [ set pcolor green ]
4 m6 Y" o0 d) F' d: o. G! _/ S ] T* v6 U9 @) `( \; P. A
end
7 P9 E' L$ ^ z. ?. ito do-plots
S) B) Z4 ]1 R set-current-plot "Totals"% i- d( S# F/ U& ^5 x: }& Z/ n1 j( E
set-current-plot-pen "turtles"
/ {4 R& R! f, B plot count turtles9 B/ X7 ^% B! m
set-current-plot-pen "grass"( s6 D9 u& r3 e1 X
plot count patches with [pcolor = green]
4 C% n/ ]1 U0 ~& p6 tend+ b; Z- {6 W4 @' j! G1 `
可是运行时提示no such plot: "Totals"
& D" G. v) p) lerror while observer running SET-CURRENT-PLOT
) l: ]+ n3 d9 y5 r O" E called by procedure DO-PLOTS
7 T( s- X1 \5 d called by procedure SETUP
: a F' {3 D* }: t- [; E called by 按钮 'setup'
+ Q/ c& I/ c8 U+ b9 j8 }- W0 q求大神解答啊 |