我编的程序如下turtles-own [energy]% U% E* s9 B/ V8 N1 Q9 C# f
to setup" m6 [$ C& o: C/ z+ M, Z6 p( Y
clear-all9 b2 f, Q% T; Y# M, t. c# S
setup-patches
2 M8 |6 b- O( ]$ z! U6 g# g/ u create-turtles 100* w& D9 B# X- I& \) A: M( W
do-plots# {4 Z$ W( _( m: E4 F0 E# a9 X3 L
ask turtles [ setxy random-xcor random-ycor ]9 m8 ]1 e% D6 B# | |% i/ y
end
6 W# b: c# O/ oto go
2 f4 l- j; M/ @6 J3 s move-turtles
2 j. A: p( z7 C; m$ N eat-grass: @1 e x% U% A, b/ ?" H2 X
reproduce
( p8 t* ]; S+ W a/ A check-death
4 Z% C/ G! t& H8 `& D$ a) w% q$ D regrow-grass. K- M7 a- f0 Z9 s6 C$ l
do-plots
L4 D' N# \- x% _$ @0 kend9 l2 }- k ]+ V& y
to move-turtles
" d: x, G) f# L, J7 a ask turtles [
0 c# P6 k/ |# V$ Q [' S9 R5 \ right random 360
6 k; L$ t8 u) T. F$ Z4 T" p* G forward 15 Y* o: k& f7 W8 Y( F' y
set energy energy - 1; w( _0 }% A! D
] s' U* w* E$ v* r$ X7 r E( ?
end
0 o* i4 L0 X9 j& c# Dto setup-patches: A ~& M- i" e/ r+ Q; O2 R
ask patches [ set pcolor green ]. l, v' g% b1 k* I7 ~
end
0 {6 N* h: H% D- y( qto setup-turtles+ q8 J/ z; D, d( S/ i
create-turtles 100# W4 i0 K) ], u) c. s
ask turtles [ setxy random-xcor random-ycor ], P# |& B- N3 _8 E9 E" V
end
( S. d! s, i* p9 M8 ~* Q! Ato eat-grass
% ^$ P* a0 w2 z! k( ~" J ask turtles [
' q$ t8 ]0 K7 ?' k if pcolor = green [
" d- _/ F! t; I1 T2 f, G9 S set pcolor black- O* R1 F9 r/ Q3 c( L s! a8 b
set energy (energy + 10)
1 F4 l9 i' ]1 c2 J" u0 N. J' w4 M3 W ]
: h: v* }( c6 m8 ~ ifelse show-energy?
, l! {2 |: R2 f/ a c$ n4 D [ set label energy ]7 o, W: g7 P1 m$ }6 \
[ set label "" ]
8 X- g1 C4 E O! G ]
' q! w+ m' u1 s0 i2 Kend& `* V/ N/ {- i3 Z2 r" H9 E9 E
to reproduce7 Y- v) O2 k8 V8 }6 O$ c5 m" [
ask turtles [
. V7 D+ P5 }! g+ M1 D if energy > 50 [
5 y4 T1 S! D1 f. i set energy energy - 50
7 l4 @4 H- h. Q: ?' k" S hatch 1 [ set energy 50 ]; G1 i9 I4 d7 t, u# B( q
]
& o& [/ H$ u+ I7 @0 I/ w ]
+ ~) A x) `: c0 h; j0 {end9 ], w! N0 g. ^
to check-death8 ?6 Z( N7 t9 \$ ]# V( J9 p
ask turtles [5 E! f( Z$ r0 o1 N& w; x' ^
if energy <= 0 [ die ]( y, r" @9 p1 _2 K0 C( c. m/ b+ m: d
]
' Z* Z$ B- c) r# v$ C$ f3 bend2 r, G5 {1 }% E
to regrow-grass* p) a2 u7 X# L8 ^; ^- ]. `! }1 V- t
ask patches [
0 h# d u9 _" P! B$ [( X' L if random 100 < 3 [ set pcolor green ]; |5 |/ w. Z+ e/ s" T* M
]
& Z' e# x9 H/ ^# s2 t8 H4 o0 W! |end: x6 \& C/ h& W2 W4 B4 @4 f0 g
to do-plots
) m. @/ ^9 `% _$ Z, F3 d. C' Y set-current-plot "Totals"
# O6 B2 X, V% m, H5 j set-current-plot-pen "turtles"
9 `, \% I; ^! H# x, @ plot count turtles7 h1 G' z/ M- A% S0 p& b1 I @
set-current-plot-pen "grass"9 u: [; U* d3 C0 K. e5 S
plot count patches with [pcolor = green]
3 A% ?4 l$ p) T. C" p4 D) Eend" Y1 e# W' j$ P" Q# ~, k
可是运行时提示no such plot: "Totals"& n, G+ } i' \, ^# Z, k1 a
error while observer running SET-CURRENT-PLOT$ {7 k; q, t2 z" ]
called by procedure DO-PLOTS9 c, o7 V% Z6 ~9 h& a& H, o3 y
called by procedure SETUP
) T w, K2 R4 R* I called by 按钮 'setup'
3 }5 ?0 m( J2 r$ j/ m( k求大神解答啊 |