我编的程序如下turtles-own [energy]8 h3 e5 V* X: D( p# z$ {
to setup
5 z* u: l: ~$ \% b0 f, p clear-all# a! b9 R$ s* D7 z2 d# j# m' J9 O
setup-patches6 F( @8 v. g, R9 D5 F: {' p. L
create-turtles 100% ~4 Z0 v8 H* i% E3 B& U1 o
do-plots; r8 q0 {3 @; M. p. v
ask turtles [ setxy random-xcor random-ycor ]
* V( L. f% L% Q- q+ s+ ~end
6 s- U# i, o1 ?$ m0 nto go) g, U0 y2 b0 y M
move-turtles3 |+ L4 @) U) }' y% g( B
eat-grass
" N8 ~2 D4 C% i reproduce
7 c' ]6 v2 U8 t: N1 F) J- t3 C check-death) k# K1 f# {# D% \8 f/ w2 @9 F& `) }
regrow-grass3 k0 x2 f8 y3 |% c/ m
do-plots
: Y& Q8 u$ [& h- C9 D4 oend) R9 P6 M. H4 }
to move-turtles
) V) j8 B) F, r8 I- [( Z ask turtles [
$ s+ t4 I3 P* ^9 A7 V, N- J right random 360, y% f; o( Z+ C$ E- K7 _
forward 1
) Z! ^+ d4 z1 a set energy energy - 1% a; M: e; S* E0 Z
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end
) y' H; {$ H6 `! b' nto setup-patches- Z( q( u9 p& [% z: m5 G
ask patches [ set pcolor green ]
2 o' H+ B! o: ] }end* ^& L, h4 [3 Y) T4 j
to setup-turtles6 b" o& c0 V: Y' N6 T, R' _
create-turtles 1000 Q! @, ~0 G- [, _# x
ask turtles [ setxy random-xcor random-ycor ]) W# m. |% |+ A* J& ^7 m5 j9 x
end6 r( W8 \7 a$ { W# B
to eat-grass
% ]: _/ n+ v6 Q- e ask turtles [
3 T0 Y: b' ]$ z if pcolor = green [
6 w3 w9 w" ?" K: i% X set pcolor black0 N& |) H5 g1 D' k5 ]
set energy (energy + 10)
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ifelse show-energy?
8 K3 j# }( K8 y0 t. v& d [ set label energy ]
! V1 A* b/ s* K, \1 C/ {5 b [ set label "" ]
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end; D3 {: r2 K; c& b/ x% y
to reproduce: ]6 @5 R' Y# a7 s8 F/ ]
ask turtles [
( a7 H4 t4 L) B. E3 V* o if energy > 50 [
) i# O+ f) y4 `* T: `0 y set energy energy - 50# W) _0 r6 k. _, t% l3 s3 m
hatch 1 [ set energy 50 ]+ H& U) H4 F J% [
]
. Q7 S. \4 n# G, M ]
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to check-death( j1 |4 q) T9 n; _4 P9 }* \
ask turtles [" y- }7 G9 c! e* A- e
if energy <= 0 [ die ]
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end
/ c- t: D& e; F2 k) Zto regrow-grass
1 {' a1 P; C7 I6 }8 ` ask patches [) @$ F( I" @8 N; p O
if random 100 < 3 [ set pcolor green ]
; x9 J9 [' h* y0 A# i: \+ v ]
* f. l( P: R5 f' K @) ?: U2 bend
; O8 f5 d6 \$ K' K# v. yto do-plots7 ^% |" g. a& O$ g5 E/ y
set-current-plot "Totals"8 r0 I( ^$ e+ F* ~# e
set-current-plot-pen "turtles"( `! v! D4 V# e# [
plot count turtles
( K4 b& G( C+ {" E: e$ C; e9 k set-current-plot-pen "grass"* S( R2 e0 _/ O5 H2 p, y! |$ K
plot count patches with [pcolor = green]7 N6 @2 A* n7 z# q( G( {
end
5 {& D0 w; \2 l4 q可是运行时提示no such plot: "Totals"5 S% S$ o2 P$ w( @
error while observer running SET-CURRENT-PLOT5 r W7 M; N5 c9 q+ e9 U& [
called by procedure DO-PLOTS K9 h: \. Q6 `$ \1 M/ D! ^# K y
called by procedure SETUP* v! g# P! n d: `& A
called by 按钮 'setup'
, q* u) ]# \ s( S8 h& Y: a2 K求大神解答啊 |