我编的程序如下turtles-own [energy]
4 l# v: f2 G* ~$ zto setup
& J' f/ s& M0 i4 d, Z( ] clear-all
8 E2 C8 x7 q. V2 e' S setup-patches
5 X5 p: t" v; \) U create-turtles 100
& I, F# A( _% c; n% t& i do-plots
0 x! |* T6 \ Q, O9 O; i7 E ask turtles [ setxy random-xcor random-ycor ]
; q4 q; g0 j: @( }# Kend C; V: s& [ P& }! r* Q" N v: _9 w
to go
! X r% E, R" p; h t move-turtles4 j) ~6 F$ s7 f8 Z( `
eat-grass
0 }- ]' O5 B' b4 K. y1 P$ H reproduce5 p7 e$ b. C# s
check-death$ h: m9 B% _ t
regrow-grass/ O. O! X1 o' e% \4 C' Q* ?& K, d, t
do-plots# V* K- B8 k( O
end5 s& o9 G0 p8 s! |
to move-turtles
{( g& b! j3 _' w ask turtles [
7 ?6 `9 `8 l+ }0 g right random 360
$ Q: B a8 n: h+ ` forward 1) S: F j$ M' D7 r- k( z
set energy energy - 1' M+ B7 F! D8 m2 ^% v
]
T8 e1 x1 T0 K. N3 I9 j Tend
2 Z. b: K. q2 B) U, z9 t) k7 P3 cto setup-patches
" ]+ B' M$ `0 p$ n ask patches [ set pcolor green ]# Z& q# @9 t2 ]1 ~7 d
end
: g6 i5 U: O' \: W6 \to setup-turtles
7 V7 R, G9 P" c* [2 j- w! c create-turtles 100
5 ^$ h9 ~2 b, J! \4 ^6 B* r ask turtles [ setxy random-xcor random-ycor ]6 E' S$ M3 y2 x. _
end+ ^2 s( n X. r. Y1 { L1 A
to eat-grass* r+ G5 o) y$ E! a1 `- q
ask turtles [+ p2 \; V l$ i) E* v9 Y
if pcolor = green [ e/ s/ j" H- U! R" c) o. ]
set pcolor black
* R! |4 M$ i/ n( c7 w1 [( A set energy (energy + 10)
5 M3 `1 s) H. P9 m( T8 C ]& b# S& w/ U7 b0 V! ^) n; |2 z
ifelse show-energy?
- J* `- A' I! l1 G/ } [ set label energy ]
' e2 _* C6 f, f1 w0 x [ set label "" ]! g7 d6 C" i/ k8 g- Q0 j9 |
]
: ]* Y! u `. V6 C% O9 vend: ^# I6 T# R1 x
to reproduce/ {+ X6 J& D- g2 o6 E8 W% E: p2 D! Y
ask turtles [
" R3 h7 }$ O1 V* I, W2 K0 \# k% l. D if energy > 50 [
! @: `: x4 x" J# b7 b set energy energy - 506 ^7 }. y2 N+ z" }. K( i
hatch 1 [ set energy 50 ]
3 o) T5 z: P' B! n# G8 z& k ]
( L' P3 r8 ^5 f: h/ A ]" m7 r8 v& z2 F) Z& w. a. e3 D# B& D& Q
end+ t( M$ b3 n- p/ \/ L8 [. Z: u: `
to check-death
# T) w( {8 \* w! H& w6 G; S ask turtles [
) D D' O, I+ n% P( ` if energy <= 0 [ die ]! l4 C+ c5 V9 n
]9 m/ L+ A: f& \, x) _1 P
end
7 g$ h X7 f5 M: G1 t6 [/ Gto regrow-grass
- Z* m' ?# c8 p. ^ ask patches [% o' e$ a; K; x- n
if random 100 < 3 [ set pcolor green ] G1 v2 _2 S) J5 b
]
; ]4 b" ^: A1 Z3 nend, W1 o) B* F' @& c# o. g; c: b
to do-plots
) C& K' \- ?. G4 o# \ set-current-plot "Totals"& L! e" i# h, F& @3 U
set-current-plot-pen "turtles"
! i+ G" j' \' L6 @( P3 y5 Q5 O plot count turtles2 X! Q3 `/ E8 W( i! D+ f8 N
set-current-plot-pen "grass"
: g, b+ L3 y( M. B plot count patches with [pcolor = green]1 m8 \, V% U" [7 ^0 g1 z" g9 v
end" _2 N4 a: W* F: B
可是运行时提示no such plot: "Totals". u7 l( ^. H7 A# [6 ^4 M
error while observer running SET-CURRENT-PLOT
$ {* z# f/ O* A [' m called by procedure DO-PLOTS( t6 f, K, b: ?) Q: _" L+ e5 Q1 `' k
called by procedure SETUP
, }& [; n' z6 s; j called by 按钮 'setup'7 d$ f' \( d/ Z0 g+ g7 K
求大神解答啊 |