我编的程序如下turtles-own [energy]
& B( P$ V: e$ O: n+ q' eto setup; V. ~0 p8 Z9 C
clear-all
4 p9 p. F* ] H* B- J% t: } setup-patches
( y8 k7 B* n+ E create-turtles 100
6 B. [" ~2 D& G do-plots
8 e" q2 J8 ?/ m4 h5 X: R ask turtles [ setxy random-xcor random-ycor ]
4 b3 j) ]. O, O$ L- H2 O- [end! V* S- M; C7 B7 _2 ^; q5 B
to go
% {. |$ V0 {% T; \7 {* }2 m move-turtles; p- X! k$ A# L
eat-grass; g4 h7 b( y- {3 }6 B' ~3 c) H
reproduce
* r7 Z. T( A8 W* A: W check-death+ q F( ?, ^* G+ k0 X
regrow-grass
6 [. Z, ~, ?9 F7 l do-plots
! E! S4 r# X1 o5 `end, }! a4 A! [$ g) Q. r; L/ y
to move-turtles; s: v C/ W( G1 T( F( J
ask turtles [
; O1 T9 }+ a( c" `6 h V7 P right random 360
8 H+ C# Y1 J: J. j forward 16 J1 Y9 e; [7 M* a k# f$ u
set energy energy - 1# B; z; e! T& ]; E' f' z
]- j) l: \% G3 M% n& G: h
end7 q3 q t6 `6 R z2 L& a
to setup-patches1 U; F9 `9 u: _+ j8 R
ask patches [ set pcolor green ]
1 `7 a8 C* W2 v9 q( r+ A% `end
4 L3 k2 P7 n1 w# [: u' Tto setup-turtles' j; I7 @% l& s- t% b
create-turtles 100
4 Q* Q: H) Z) A9 y. \2 U& t ask turtles [ setxy random-xcor random-ycor ]
3 B4 L* [6 a" u- P Oend! w' F9 F* [$ r$ u
to eat-grass9 O* Z7 D6 B4 h, s; V" v) t* S
ask turtles [% W) G! g# |( O) K6 T
if pcolor = green [9 C# p8 A! J8 W+ ~) B! S
set pcolor black
t7 c; H; G5 Z5 G+ A set energy (energy + 10)$ I0 ]0 Z( z( d8 n" A
]
& r8 v3 @7 w9 j) k5 Q5 {) }9 q1 w ifelse show-energy?
l. X; Y% C! Y% F9 `5 m [ set label energy ]
, d/ w$ ^" C( c% v1 `% T7 h [ set label "" ]
. A5 z9 _! M6 }9 _0 | ]7 C" p8 M0 R/ p
end
0 \5 f$ c) F' T" ], \/ A$ ^to reproduce' _0 j) L- l& _7 [
ask turtles [
4 J+ N' c0 d* Z* K5 \4 ^ if energy > 50 [% E. J0 o) L9 w* u" k' s: m
set energy energy - 50% w- A% L! ]1 X2 s5 Q4 j; b
hatch 1 [ set energy 50 ]: P' O7 @. z) q" T
]
& \9 O6 r/ b/ @ ]
( B# G0 C4 a g" E% Gend+ Q5 C# A+ B" B8 F
to check-death
, Z4 u$ Q* k: Z" W. q" M0 d. Q6 U ask turtles [( C) p, }$ C0 b3 v8 l2 G
if energy <= 0 [ die ]1 q$ c5 z& [$ {( e: s
]! E" T% ^" p' G8 P) C0 E' L* N" ^
end
* c1 [% c& J9 @' ?# rto regrow-grass) `( b$ z) h( N! P: w. h
ask patches [
5 \' j5 A# I7 ?. {2 u8 G if random 100 < 3 [ set pcolor green ]: p+ W% K# B8 ]" s4 B; S# G6 O- c* w! U
]
, l- M2 @6 V; ~5 j# |end& [, y2 u3 h( f1 G1 G9 \
to do-plots( g K5 x) g; ]6 z
set-current-plot "Totals"( C! m) t E4 x: U0 i
set-current-plot-pen "turtles"
$ s7 w8 A( G2 e4 Z& G7 p plot count turtles9 `* p8 q2 N q# u* a+ S; S
set-current-plot-pen "grass"
' t2 d- y* N9 ^3 G plot count patches with [pcolor = green]/ H$ C/ f4 a% @
end
; {, @3 E+ i$ @5 [: T5 }" Y可是运行时提示no such plot: "Totals"
, i4 U4 Y Y9 x' \error while observer running SET-CURRENT-PLOT* w: X: m/ A1 v. ?
called by procedure DO-PLOTS
( c3 N3 s& K1 l4 z called by procedure SETUP
8 N7 L2 Y4 e( Q2 Z" J called by 按钮 'setup'
9 P0 W) r: L/ Z, f, m7 M/ C+ @' ]求大神解答啊 |