我编的程序如下turtles-own [energy]0 j! W5 w: Z9 |0 G! p. e
to setup
5 x- j( T/ H; j2 h: N+ u, q' J clear-all& s# y4 ~' Z3 a. n4 |0 s( Z+ G
setup-patches$ \1 ^+ V \6 W
create-turtles 1007 K) i" ?" X# D% V7 @! S( k- B
do-plots- \3 F {" N% I" N$ ?& |
ask turtles [ setxy random-xcor random-ycor ]
# I* G" q ^- Cend
) |9 p% {4 \' t! a3 F) I Q! Vto go' ]5 e& K. T! W5 R) e$ c
move-turtles
7 p( P: l. F$ @$ s+ z1 _ eat-grass- B/ w# @+ \4 `
reproduce+ l6 x7 z$ i' t5 m0 [# C2 y
check-death
8 O- I! o( g S regrow-grass
2 @$ ]# ^, r/ j% l; Z+ l" X" \$ [" l do-plots0 } J2 F, S% I- p& d3 t
end
% n4 w- P1 c& Y- Vto move-turtles
2 ^( A T5 ?5 W& V ask turtles [
. |* W& y/ ?3 e6 {* m9 t8 [ right random 360
* ]9 m3 K- s0 Z: j& ~2 X forward 1" T; B3 r0 Y/ C$ O0 G
set energy energy - 1
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end1 }* {$ v5 O: T: p
to setup-patches
" w5 N, D; n# E* Q/ A8 l7 ~ ask patches [ set pcolor green ]
9 N. ~' m+ R% o7 Qend; G/ \& ^. g3 G: w% O( q$ V# g
to setup-turtles9 Y6 P) @( b( H
create-turtles 100
6 j9 H* C+ ?$ D- Z: _5 E ask turtles [ setxy random-xcor random-ycor ]
' f1 F2 B7 H% H7 V0 k/ |$ Wend
@: s* M$ q( v, X, `to eat-grass$ {. B8 x( n4 @' z
ask turtles [
) n' ?8 o) Z' t/ g1 U! m if pcolor = green [
4 f0 S/ K$ Z! v4 |# g" R set pcolor black! ?2 f8 ?7 |, k: }
set energy (energy + 10)
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# A( Y: v, l: k. S ifelse show-energy?2 a, g' ]( E8 c7 X
[ set label energy ]# w: G7 Q) i0 t6 u1 _' [
[ set label "" ]
6 S" Z+ A' f( e ]
! K# L G) ^1 ^6 O- a; F: xend, Z4 J# P- o w% W: x" H/ @, D
to reproduce: l+ w: n G1 c3 m+ Q/ X
ask turtles [+ E: r$ ] J' @1 \5 V7 U
if energy > 50 [
, i4 l. l1 S& K6 q set energy energy - 50. e% |) a @5 z6 U! n
hatch 1 [ set energy 50 ]3 P' T, h$ ]& M* A
]
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end
6 k1 T2 }, _2 u" @( fto check-death
$ c* o, C9 A; O e' f: ~ ask turtles [0 A2 H/ W" H% \+ g$ G
if energy <= 0 [ die ]
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end
( h% t, ?3 N) @5 Dto regrow-grass7 g* p9 T5 \7 J- g+ s# u+ [
ask patches [
. |* B% T: ]3 F6 h! @ if random 100 < 3 [ set pcolor green ]9 Q" Z8 P( f7 H( d4 q* {8 z5 A* m
]
2 n5 Q; a5 c; H6 Send8 W4 n( z9 B, a- a2 j
to do-plots0 O' a) y% C- e; L0 h, p( e
set-current-plot "Totals"6 y/ n$ ?- y, ?$ t/ ]' ]
set-current-plot-pen "turtles"
5 j3 Z0 \1 I, }; v plot count turtles
7 I5 Q+ w5 C7 h$ r9 Y9 M set-current-plot-pen "grass"
, o% L h Z! u v( D( ] plot count patches with [pcolor = green]) m4 A! T R; V% {
end0 O0 \, J; D3 D( I9 k9 p9 T+ Z
可是运行时提示no such plot: "Totals"1 m K, I# c; B4 J' ]
error while observer running SET-CURRENT-PLOT
6 O7 i$ \0 I- T, B0 H1 p4 B* ~' V called by procedure DO-PLOTS
& i5 j" A- t1 _8 h9 _0 R, _8 t called by procedure SETUP
$ j, f/ q: x' N$ E& V, g called by 按钮 'setup'
) W% E8 ]$ S- D求大神解答啊 |