我编的程序如下turtles-own [energy]: i7 n; i+ g' @# R# f6 p
to setup
, p$ ]7 S1 o0 |5 t& c4 S. I clear-all- V2 J. i+ F4 `, p/ D/ c
setup-patches
8 T4 o0 e; y' | create-turtles 100# j9 E- L S2 l' P$ @
do-plots! U2 x. G b# l# W% x7 a& j
ask turtles [ setxy random-xcor random-ycor ]- y# A& |3 y, U5 q
end
~% b: l& T& i4 kto go
9 a! t8 @/ p* H ~# c# A move-turtles" k& v+ _) ?* R# U! k7 b& S4 @
eat-grass: `2 V1 G `$ e; f
reproduce. ^! k V* V y! U9 w
check-death, n. x* c0 I1 R! Q
regrow-grass
4 L' S* N. G+ f& ~! N, L" E do-plots
8 ?, w a3 M) ?3 Wend
3 w0 |8 K( d' w/ Uto move-turtles
# ~( d% {* ?- _8 `1 G9 c ask turtles [( P/ c3 i, a$ x' Y8 Z
right random 360
: [+ J; B2 n4 L4 e6 X% } forward 1! f" I+ {, v4 Q, F. E) a
set energy energy - 1
) s6 W7 |; m0 a4 Y2 H3 u/ k ]% C$ {8 T {: ~$ U3 E) U/ s
end q. r3 G, H# B9 \
to setup-patches
5 C! {2 W* a" W6 T( G ask patches [ set pcolor green ]: M2 D4 Y. b/ n5 \0 k: Y8 ]
end4 M3 ~+ l* M9 g0 Y# |% n0 ?$ `
to setup-turtles) _' f5 f- Q7 K' q! E3 L
create-turtles 1003 ^+ f* T' U" W4 c6 G( g
ask turtles [ setxy random-xcor random-ycor ]
5 j0 w( |% V, g4 ^4 G- lend
; V( P# `0 j7 t" u6 U+ ]& k) ?' \to eat-grass
. H' c1 [: F3 J' j ask turtles [( V6 P# j* K' i- K; A; @+ F; N6 ?: R; Z/ o
if pcolor = green [
+ }! _, e% S9 {( Q, t$ t' F set pcolor black
1 F5 v8 a c% I$ f! T set energy (energy + 10). s; s/ m" G& S F6 Y3 O: B. [
]
- {) N6 [ b7 @) w+ I) e2 t( R ifelse show-energy?
" a7 ~' L% T, R, `; Z1 w, } [ set label energy ]7 P5 X0 F: D [+ Q: D1 \+ f% G( Y# ]
[ set label "" ]
. s% A4 h' R! S7 V! G9 B) @" Y ]4 i8 k5 ]. h) Z4 S
end- o% D9 y) h% G6 s/ J" u( N
to reproduce
" x. e6 o$ }) C9 D+ m' ] ask turtles [
- Z8 i: t0 }, t1 g& q if energy > 50 [9 \) E0 D7 b7 k- H0 a' ?1 ~- O0 B
set energy energy - 50
; R! b: S1 }& T8 p9 j hatch 1 [ set energy 50 ]/ O. [" |, r- i1 e: a- i6 B
]
7 H+ z1 F# z+ j4 b, \2 G$ T# T ]
, S# I5 w& E4 }/ f2 Hend
/ j# S8 y: \* tto check-death
( h6 `% ?) p/ S2 G' n( N N2 L ask turtles [. t L9 n, x& V
if energy <= 0 [ die ]
& r6 S* C4 k7 e% u X ]2 k* G, {/ @: _/ m9 I& D; y7 G
end+ L: I# P" L( r$ D- x
to regrow-grass4 S8 W- l) W/ M8 |6 u5 r1 s2 I
ask patches [7 b: R, A2 o3 ^) h6 A% J
if random 100 < 3 [ set pcolor green ]" H; M2 l; ]3 N7 k% V+ j4 i# F) I
]( c. `0 @' S, \1 w5 \! i
end
; W* E) v' S7 G; {( Z' B- yto do-plots2 O2 a7 i0 ?+ g" f. k/ C3 C* V
set-current-plot "Totals"
f: t; p6 n5 d3 ?$ p" q3 o6 ] set-current-plot-pen "turtles"
6 o' G4 o0 e ^, O- D9 r plot count turtles& ?1 k% \" U, n
set-current-plot-pen "grass"
( A: Y: h" F+ t plot count patches with [pcolor = green]
3 D- G2 W# r4 Nend
# N$ d' R2 C8 l: c9 J. v8 W可是运行时提示no such plot: "Totals", p& q5 n/ l0 {( Y. h+ N
error while observer running SET-CURRENT-PLOT
* M+ C% M# ]( X! p+ |) k/ g" \% L, q called by procedure DO-PLOTS
/ b( t6 F( ~$ E$ l# f& n8 n called by procedure SETUP( g6 ]6 L4 j1 _9 T6 ?- y
called by 按钮 'setup'
' }5 {/ p8 B6 Y: E) C- O求大神解答啊 |