我编的程序如下turtles-own [energy]
' P2 T, _6 |. o: v9 M9 F5 jto setup" Q7 a4 z/ _9 T; c/ R& ?- u
clear-all
! }# s0 v; o. s8 v4 J setup-patches
2 Z# L3 P1 T) R create-turtles 100
* L r, N3 ?. ~: O% E- S! \/ ^6 O3 W do-plots# L+ @0 d) s2 n7 `* O' I, f5 ?2 n
ask turtles [ setxy random-xcor random-ycor ]3 I: ^4 E6 R0 a0 j) H/ N
end9 S# C0 l' ]: r" G
to go
9 B/ c1 ?3 k& u( F5 G- n2 k& e. p move-turtles2 ~0 b+ S. ?" L+ ~( d5 [
eat-grass
1 _2 y3 X# ], E reproduce
4 B; U8 P" n0 `" ]& V! x check-death
" o2 j0 a0 g: W0 t: K regrow-grass
( b4 ~4 j" Z& ]( x2 A7 E; I do-plots/ ^$ s3 l. p h8 S9 @
end5 ~" q" T4 w) t3 x: m
to move-turtles
" v4 h' m, I' _( B& Q0 S" L% ] ask turtles [
9 I+ J" w, E1 S% `9 n right random 360
$ F. t' N% u3 u2 ^! G forward 19 b4 W, ]! L0 ~( j9 |- F
set energy energy - 1
' j" s" V8 ]% \0 C% D ]
& ?- p, t$ l8 o4 C& j) A+ e, A% Wend
; F% ^# l* Z% L- V& Uto setup-patches6 V: Q+ F3 C% }! r( H2 m3 ]* ~
ask patches [ set pcolor green ]
]% \% f" n7 O: e+ tend9 T# D! }/ s! V% J. t
to setup-turtles+ t5 u, K4 |1 x- d7 r M- v8 L
create-turtles 100
5 P) E% v) u7 j: e ask turtles [ setxy random-xcor random-ycor ]
: V1 p) o! l% S/ b1 N! _" Z5 `+ D, ^0 vend
9 A3 ]# J, o) z; L0 nto eat-grass( L$ o+ D( e, T1 G( Y8 |5 I, L; u
ask turtles [
& u7 r* E, x$ A3 w! h if pcolor = green [% o6 A8 W( d6 n5 M4 r# T8 k# S
set pcolor black
+ Y# r. p1 w \, m& G- ? set energy (energy + 10)" ^* Z; E# q8 Q/ s4 r. t& G$ M+ l
], A# m% V* F$ {7 e) r/ g/ G' b
ifelse show-energy?
4 N: R& b5 t/ A) s( V [ set label energy ]1 G4 j# O2 x/ b, I: q' \* e& |! O) T
[ set label "" ]
: Q1 d2 h* p' W- t' K" z ]
8 I# k5 q m) T4 L0 aend
0 t. [2 o0 Q0 B( K9 T' ]to reproduce. G! J5 b$ w7 p3 w: j
ask turtles [! v: t# q5 m$ R2 h! n, C4 A
if energy > 50 [; E8 `: C# N3 K. A' O
set energy energy - 50
' j- p) ^( W3 D( b, }* f" b6 o hatch 1 [ set energy 50 ]
5 j4 H/ a Y. { ]2 D- x) `, Z* i) F' G6 Z) J) d+ ~( k+ n
]
2 A8 G8 u3 ^' pend f7 _! [2 @, k2 e( f, M q
to check-death
* J: _8 {) y, I8 x' L, W ask turtles [6 t8 f) b) u; x8 H. K: i
if energy <= 0 [ die ]
9 a1 @/ _* y; R- i ]6 V2 t" V; A; O3 ~, x
end; ~2 Z: y, M6 a. U4 U
to regrow-grass
7 b1 s% R4 i7 f" R- f0 D7 H ask patches [
0 @" |) G4 n$ K0 a6 j if random 100 < 3 [ set pcolor green ]2 G1 A: \- j& o/ O; a) p2 _& ?4 p
]3 l7 l( F4 G% W
end i1 ]) K8 J/ {+ X
to do-plots
: w6 `4 W# D# B& c set-current-plot "Totals"4 l! E1 U. y' G# j" L
set-current-plot-pen "turtles"
' n. u$ G2 I+ L" Z! r plot count turtles
% P; w% J, R' g. ^* q set-current-plot-pen "grass"
J S4 C/ r4 Y) ~+ b1 ?5 T4 } plot count patches with [pcolor = green]5 U) ]0 M, J# Q
end
/ R Y: O* L) U+ m; M7 s* V8 S可是运行时提示no such plot: "Totals"/ y* {1 e0 }% a3 b( e3 V
error while observer running SET-CURRENT-PLOT
4 _) S2 Y. \5 Q8 d4 @& a5 q1 D called by procedure DO-PLOTS
- D2 Y. J7 E+ ]# Y2 } called by procedure SETUP9 T# O0 d% V; O( O) X0 H
called by 按钮 'setup'
% R' f1 t2 V+ z1 l1 Z求大神解答啊 |