我编的程序如下turtles-own [energy]8 l+ Y9 O- s3 G3 A- u7 u
to setup' b# M$ O* p$ [' s: S% W
clear-all
1 d/ K* c+ ^+ y- f setup-patches" z; X1 `" a1 R7 u* v
create-turtles 100
6 c/ i7 G$ K( Y; c do-plots
' d) a" w6 E$ Q X% y9 F/ R ask turtles [ setxy random-xcor random-ycor ]! L4 c: A0 \: \3 I, ~, m
end
' F6 I. _/ I8 p4 o3 z9 a Hto go
* f* G( w# I; x, v+ S; u: | move-turtles
: d1 f( H+ z# m8 H! T9 { eat-grass4 I; c2 Y3 Q0 i& Z
reproduce
) n6 ?& N7 [; z check-death
! g( T) U! c ` regrow-grass
& q# Q* c4 E* q! c, I3 M do-plots
$ g( b! m$ T4 ^$ O+ X8 C! T) oend
. ~. `' R7 u' }9 ]to move-turtles
; e7 w3 R5 X& [7 d ask turtles [9 d \ L2 S7 `" T
right random 360
+ G" s; E' n$ e2 z& z2 o3 q/ V forward 1
: K1 D( T/ R$ N8 z' r3 c' V( K set energy energy - 1
' @8 D! A6 ?( \& z J5 G6 F$ G ]( `, M) w, A) S i7 `) ]
end% K* ~6 H7 J# w# t3 x) L% z8 O
to setup-patches5 F. u* U' u( P
ask patches [ set pcolor green ]
3 \4 r# Z G2 M/ Jend# `& U& L; X; k
to setup-turtles4 {+ T5 |1 n+ a @! \0 w
create-turtles 100
6 @5 Y& m! T/ q8 D% ~1 H: q4 N, p- [ ask turtles [ setxy random-xcor random-ycor ]
0 X0 }- L, `! p6 yend
+ b! F3 b9 C8 a! G5 e: u* o( G8 hto eat-grass4 ]& F. Z5 I' K& ?
ask turtles [, Y- a: s) e1 l; t. K- I& N
if pcolor = green [! ]+ T' q/ y& A7 j \: I2 w
set pcolor black7 @( o; O6 E/ B* t. m
set energy (energy + 10)
, }: Z" v4 s3 X' p; n/ ~9 O ]* a4 ]% }+ F) F% T& \; ?' l3 Q
ifelse show-energy?8 o& S1 o9 T2 d. j" g0 K
[ set label energy ]9 d7 O/ E+ Y* F, h, z3 e
[ set label "" ]
# d1 |4 F6 s& b' k8 ` ]0 O; I6 Y8 _- P4 s: z( d: {2 \
end& D3 @2 p1 j4 H: L* h4 r
to reproduce3 Q( p% ?" N, W8 m h/ o
ask turtles [
3 K: ~% z. l6 | S8 W; ~; ^ if energy > 50 [: u0 ~! h8 M% q5 Y
set energy energy - 50
- l- c/ ^% ?& L; z; r hatch 1 [ set energy 50 ]
$ \- M- A L, [# T* W ]
! i$ v, \0 D" `) F# e9 t* N# s6 Z ]
) D' M0 g! m' |9 D$ N; [/ S: rend# ^% o" i6 s2 x% `' W+ d
to check-death
2 R. \- k. w$ a5 t# X ask turtles [
( ~, n0 u) Q% T4 |( |) w8 e0 v if energy <= 0 [ die ]5 O3 e9 ^) g- Q$ E
]
6 ^, Z5 L9 Y- A* m% q- Wend( h3 q! |0 c. }0 w/ l( z; E
to regrow-grass. T: x/ _- [/ Z- ^
ask patches [
* }0 d' F. r* M C8 |, v if random 100 < 3 [ set pcolor green ]
+ T! ]2 Z6 A3 w+ \1 q6 v: X ]
$ t9 l8 P& O9 |; bend
}* L" [% A( K% X* @5 Z9 o# tto do-plots. g$ D( r R" {
set-current-plot "Totals"
& ?; g% z, j9 c& @5 v( E1 K set-current-plot-pen "turtles"; P9 p1 _5 i% k$ p# F
plot count turtles0 d1 ^) y! |1 X
set-current-plot-pen "grass"
/ ~/ \2 O0 f+ i plot count patches with [pcolor = green]1 f3 j9 Q5 S, z- e# ~+ L
end
5 C9 \4 R$ t6 i, l! \可是运行时提示no such plot: "Totals"
* t" `, I) o- M1 f, k# Ierror while observer running SET-CURRENT-PLOT
0 x) g( p2 n7 o called by procedure DO-PLOTS+ C9 _' w' X8 U7 `+ t, W! ~4 H9 u
called by procedure SETUP
5 y/ X( N0 m0 F1 | called by 按钮 'setup'& Z$ _2 }' B" }3 P3 `# L/ [
求大神解答啊 |