我编的程序如下turtles-own [energy]: T$ V, W6 r& P1 t% Q+ w3 [9 \1 t
to setup$ e4 b* t" j D! T5 L0 N' ?( X* F* r
clear-all
8 K6 X5 Y) a( ~0 z3 O) Q setup-patches; @4 |/ {# {; e' G8 g) z& w7 y7 {
create-turtles 100
" p3 o- W( J+ J+ m, @# T do-plots
R1 k8 ?! L0 P ask turtles [ setxy random-xcor random-ycor ]1 z# o4 y" _6 g
end/ c* u: k1 {; i9 {
to go
1 L. j. h: l/ J( h, e4 X move-turtles5 z v* Q9 U. L1 F R" y, H( v! T
eat-grass
4 J7 }: j- z$ [( }( b( W A: h reproduce
2 R4 z( E2 g( l check-death6 X' }) m o; [5 @4 g9 G6 l1 \1 }
regrow-grass7 s7 g s6 k2 H: ?) y: B
do-plots0 V; t1 x' {: P
end) K& R8 X, n8 U7 ~0 N
to move-turtles
5 N( t7 L( A4 x) @0 Y ask turtles [% ~1 h C Z6 `9 _) m" T# c5 s& x
right random 360
1 s% ~6 w3 v- b1 D! I forward 11 T+ F* l! i: S9 f$ Y7 j2 @
set energy energy - 1
0 q. v3 o, E+ X ]9 g/ l+ a0 g$ h' J. y# V
end4 h2 s& r& _+ u* a+ ]
to setup-patches
y0 U7 ?7 c1 w/ { \0 g/ B ask patches [ set pcolor green ]
" N( l$ x8 ]( @8 ~# V. F" C: Rend
" ~* [2 P6 U. B7 D% O3 B( E. C' \to setup-turtles$ E+ D5 e( l1 C6 }
create-turtles 1000 v; l. ^+ t& k
ask turtles [ setxy random-xcor random-ycor ]0 {9 z1 g2 B; Q
end5 G( e4 A( @9 o0 F: e D* O* D, Z- F" X5 a
to eat-grass
& l8 b; F: L: j9 ?: A0 A ask turtles [4 W5 a7 h6 p" ^4 B; s
if pcolor = green [
3 e7 [- b7 {& o8 O+ a# B set pcolor black
' U# h: a7 b, T1 i0 X" L set energy (energy + 10)
" \5 d3 h* z. I0 r" p4 P4 u ] d+ \4 s/ |# @+ Y7 L
ifelse show-energy? |& t& v. u. q# r1 S8 P. e+ ~. A
[ set label energy ]
0 a, M' G5 G! `3 Q [ set label "" ]
/ Z; ^1 W6 r H. F6 j ]
1 d9 _3 y; w/ L lend
8 I: t' ^0 R) Z Y @" I: [6 ~to reproduce
" ^5 w% r* |& ?1 _6 `8 v. Q ask turtles [
6 M* z& f# F' f! O( A' \1 a9 z$ J) k if energy > 50 [
; i% V; n$ c% Y! S0 i9 b9 [- p set energy energy - 50
0 T# W: h9 V" i, t hatch 1 [ set energy 50 ]
0 u1 B1 d6 H, F ]% p! I6 b! o8 z7 S" X
]
! T2 b5 X0 j, ?5 a! O- Y+ X6 K$ Mend
! V+ v0 r: x4 Q+ |$ q Rto check-death
' B* \% ^4 o% v. L' ^ ask turtles [4 b, ~7 A6 q9 s, ^
if energy <= 0 [ die ]* M, H( j/ Q" W$ ?9 h! t
]
% a- {. S, Q a5 ]' V+ q; lend& i0 y, ]; }: _* z2 t. r, ~
to regrow-grass2 H% _- v3 i+ |+ A# E
ask patches [' K$ M: `, H0 p/ p& c! p Z2 q
if random 100 < 3 [ set pcolor green ]7 Q+ X0 x7 f3 M6 \
]* G- o" y3 {- j& Z* _; W, Y7 g
end
3 g) Q5 e2 d9 a, g5 qto do-plots- s4 t( m; ~0 l2 I. V
set-current-plot "Totals"+ H( T# Z. U( P6 w, Q( B2 ]
set-current-plot-pen "turtles"; f: B3 e l" u: z
plot count turtles0 P& o1 y7 w: v: I0 l& Y) i# _! x
set-current-plot-pen "grass"
2 x- i5 t, B6 ~6 |' R' V2 L4 Q plot count patches with [pcolor = green]
: n& Z/ w( f3 \/ [end
b& B1 C3 A. t. Q7 j. r$ L# ?7 [可是运行时提示no such plot: "Totals"
9 N E$ q6 ~0 Q( jerror while observer running SET-CURRENT-PLOT
7 `+ F2 C. I) C7 a4 S5 p* y called by procedure DO-PLOTS! N. |9 _, d: x) L7 }! q6 e
called by procedure SETUP7 [' ~- v! n2 w4 f
called by 按钮 'setup'4 G! A) u, P) R! a G8 R
求大神解答啊 |