我编的程序如下turtles-own [energy]$ X6 R2 f: k4 [4 M0 p/ ^7 j, S
to setup* c9 X! N- \( t& ?4 d/ M- Q
clear-all
/ u" G+ N+ {. Q7 @ setup-patches
. Q) R: n+ ?# Z create-turtles 100: j# a% Z5 d! C7 ~8 M) f' s9 V9 _
do-plots( v6 k3 \ b5 _& t( A
ask turtles [ setxy random-xcor random-ycor ]7 d6 x8 M, T+ E& u2 z0 X" Q: z4 y
end
! A2 }3 Z4 T G, u ~" Nto go
O( @6 p* p" C. t$ q# ? move-turtles& f- u+ A5 g* Z+ q9 I
eat-grass
$ D9 Z3 _0 D Z# Q reproduce6 A7 N: {, U# A9 O: {" e
check-death
1 m' }* w' C4 X& W" G regrow-grass& ^5 y# u& t! v$ ~( c9 y
do-plots
1 J& w: m0 i7 C: _end
9 X- V% J2 T" D% ]to move-turtles# w6 i/ j3 P/ z; t [
ask turtles [* \' @ E5 q9 z, f k+ E7 o
right random 360
5 K" h/ T6 I7 C3 h forward 1! w( G) `! J8 ?; m7 N, Z# k
set energy energy - 1
0 D/ B1 P# _1 D5 K ]
! u4 f- E, M) oend' l5 d7 x- t' P# {5 V7 g
to setup-patches
. z$ R. b, D O/ X6 M ask patches [ set pcolor green ]9 p& F- A, w4 h6 }, c
end# g( j" q: _0 H; C9 `
to setup-turtles
9 j2 t0 K. u+ A create-turtles 100; `9 }* R( V0 t. Z, w2 Z
ask turtles [ setxy random-xcor random-ycor ]; S* p. a# S+ b& H: Z
end
& m. O# @; C! d3 C P3 ~to eat-grass1 p% N" ]) ~. c X5 F K+ ^& V3 X
ask turtles [
* P0 S; E# z8 ~0 f if pcolor = green [+ d) K# P. X$ [
set pcolor black+ S3 ~% I0 q2 h) j' T7 H
set energy (energy + 10) H+ m. y0 s6 _/ u, g5 M. E% T+ V
]
" U7 ?' `5 T* G: M8 X ifelse show-energy?- |, _! n9 \2 T3 y
[ set label energy ], t! w. w2 Z) Z+ a' v& [ I: L
[ set label "" ]8 ^9 r8 y: F7 g
]; y7 {/ ?3 J4 u
end
Z, I7 ?$ h; V! c* Z3 uto reproduce
$ V) t# v3 G# L2 k ask turtles [
5 ^; i* G6 c5 Q6 P3 z4 M# q, x1 t if energy > 50 [) H* ~- ~# t% c' f" Z! o6 m( ~4 _' e
set energy energy - 50
; {- |% O% N! ?* K$ m hatch 1 [ set energy 50 ]6 C7 g& L4 D2 l
]9 o$ _. o' S# K' e- @( P% ~- H( g
]
! U9 Y6 L# ?: p# nend0 E/ s6 g+ Z7 u& y- V% G
to check-death7 {7 H( U; Q( d1 m: m3 b
ask turtles [
! @# N- I+ Y3 [ if energy <= 0 [ die ]! n/ {. H3 _% O( h c
]
/ Q7 Y" |: Q, c" P1 S+ M1 Z) Pend
, p. D1 p$ T4 O1 `+ vto regrow-grass
# M" b+ q. P) X! n; { ask patches [ A B: Y' l3 `: }
if random 100 < 3 [ set pcolor green ]
. e3 y; H0 x3 Q$ U ]
- M, m1 m% H+ q0 Gend2 D" ?4 Y3 Q( W4 A! x- Y# x7 {
to do-plots
+ J$ ^! P6 U) P! Z; J" X set-current-plot "Totals"! Y [7 N) q0 j. D$ a2 w1 u- h
set-current-plot-pen "turtles", s" Z5 K% e5 V2 J6 E
plot count turtles9 C9 w7 h$ O; T" P/ r
set-current-plot-pen "grass"
: }* y8 d0 C6 g plot count patches with [pcolor = green] h$ G" A4 \, U5 C* A
end! O6 D# U) o6 Z! o# P: N0 l
可是运行时提示no such plot: "Totals"8 E( h6 a: x) M* B) a9 M
error while observer running SET-CURRENT-PLOT# H8 u8 @. { M8 E5 Z
called by procedure DO-PLOTS
: h9 a: H6 @2 o. v3 E called by procedure SETUP, _. g9 a0 c- h7 k0 K4 Q& |' T+ |
called by 按钮 'setup' L ~ v$ o A/ w$ x D- }( i3 [
求大神解答啊 |