我编的程序如下turtles-own [energy]4 x! J; V4 z1 S' W8 U* q
to setup0 h4 }% N+ F9 h" Z. r2 p, w
clear-all
. K5 K$ w( d$ Q4 G7 ~ setup-patches" m, Q, c- Y- K5 s, F! @5 S: a
create-turtles 100$ D0 ]/ ]! X1 O# d$ ~- ?
do-plots* R) S5 @) j0 U& L
ask turtles [ setxy random-xcor random-ycor ]7 N2 ^/ o, k; t8 o5 ?9 U' q
end1 q6 k+ e3 ~/ c0 a' L& d% i2 C
to go
/ Z- C4 l1 W8 j* b move-turtles
1 c8 a! v2 \2 m. q5 [0 O- O" K eat-grass
1 m3 c# ]' W0 W" \" x6 {% y reproduce
6 z- i! m* V: M check-death
4 E/ n9 J, w* \- r' h regrow-grass/ ~6 p! w+ E% _. ~* L( D
do-plots
+ c: v+ A4 V8 o# u% P9 Kend
( m. P! I4 b4 e( L; o5 @to move-turtles
) V( H0 {3 @! v ask turtles [
8 [7 n5 m1 W* F: V& D) I" \1 \ right random 360+ M9 C- I9 K8 {* R3 y# C: `! g/ D
forward 1
& e0 m. u; a8 B7 B set energy energy - 1 W, d/ o5 T6 o
]; J7 J& k6 k' `
end
; V, a: V! P! `: x! sto setup-patches8 C# d9 ?1 r) m6 ?% m i; {
ask patches [ set pcolor green ]7 A9 }: o% [9 b/ e
end/ N( Z( R; H' S, e
to setup-turtles! d# @2 k5 w3 s& w5 |5 M
create-turtles 100+ i+ S7 O3 s/ ?# I
ask turtles [ setxy random-xcor random-ycor ]
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to eat-grass
5 g6 A6 @4 ^% I% L0 C! `. z ask turtles [
1 F4 I3 @# m: q0 P if pcolor = green [
# f6 V9 ]) }: | set pcolor black9 D! E+ G& A& v0 v8 Y! C$ m$ u
set energy (energy + 10)
# A8 ^3 S. ?% q( C8 q& t ]
0 R$ ]) q3 W: L7 [) I6 Z1 ` ifelse show-energy?0 O' u4 v# D8 w
[ set label energy ]* V* i, \* n( B
[ set label "" ]
. K3 n+ x5 g: p0 j+ j6 \2 D! P ]
# y. r* U+ ^: @% f; _$ ~end+ k v+ g# v- t' B
to reproduce
- _' [. g) F8 a; B) N0 n ask turtles [
, l) E ~2 c* [" y if energy > 50 [7 [5 R7 h4 l, b6 T1 a9 S
set energy energy - 50' t7 s$ ]1 t$ T) |8 w" b
hatch 1 [ set energy 50 ]. f" v0 E: i- a' S8 _* N6 j+ _" g: i
]
" g+ ?: y( y1 M& f ]$ G% r- B8 U7 S0 `" m
end
( t. {9 h6 e( G! s. W; q/ M$ Gto check-death
/ m- Y9 h5 Y- o+ y- O8 R ask turtles [7 |$ g' W! D1 r* x& z
if energy <= 0 [ die ]5 P- g4 l! B' r( F) I5 d4 H
]- c: R& e+ U' ^) w; R
end
% C+ s1 R1 Z% C( v$ ?to regrow-grass/ m' [& O W7 c1 `$ L4 `7 F/ l
ask patches [
7 G p K/ q( O I if random 100 < 3 [ set pcolor green ]
$ x( P) N) m. k' {8 ^8 K7 } ]. u8 l( i/ _2 K& V0 L
end8 ~& d) \) S% R2 {) { X% E) w1 G
to do-plots
2 c, M; N1 P! W set-current-plot "Totals"3 i4 c: q: g4 `& Q( J# B2 V9 a
set-current-plot-pen "turtles"
" d! I, h8 m4 a0 j) a9 J: s9 \: F6 ~% w plot count turtles0 `$ K, z$ d6 Q: |6 p# `
set-current-plot-pen "grass"
' Q+ m4 n, v V1 V8 f3 k3 M plot count patches with [pcolor = green]
3 K$ ]$ Z I2 n$ n- Qend
5 X+ W |' t5 f# _可是运行时提示no such plot: "Totals"
! w- e! z- u t) Y# Oerror while observer running SET-CURRENT-PLOT4 O2 O$ [6 D' n' v& P9 _. G3 m
called by procedure DO-PLOTS% T' Z8 \/ }7 ^7 P! J8 n; ?
called by procedure SETUP' C0 E. ?" ~' ?8 C8 n
called by 按钮 'setup'
' b& \3 i$ O% W求大神解答啊 |