我编的程序如下turtles-own [energy]/ s# M2 x9 j) m; y [
to setup
. A, R* k2 J0 X/ P m0 H clear-all
7 O% A; E4 @% U4 h/ `- m setup-patches
' u9 w! y5 v; P create-turtles 100
0 n1 T. q- @5 Z- ~ do-plots; }4 f3 i# Q+ [4 I$ `
ask turtles [ setxy random-xcor random-ycor ]& }; S+ z! ?# `7 L5 Z
end
2 k8 M- M+ f! E: i: xto go
1 B( X/ A3 m* H4 \ move-turtles
' m# `& F) U# ^& F) a B eat-grass* |& T, [# i, g1 `1 J# e* W- L ]2 b
reproduce$ u# [7 N; O* j I, T' P& t
check-death
4 y3 L H" C4 s8 t Q regrow-grass+ q9 b* r6 \" s4 b. b& _- K# \
do-plots
) z4 H3 K5 j' D Yend
9 b$ m1 R1 l" k5 K% \0 ]9 x$ Dto move-turtles3 o4 v3 W0 _( O" l
ask turtles [. b! b/ M2 w" o/ d8 i
right random 3604 S$ ?+ V4 N4 c2 i
forward 1
& T7 x/ U% |$ X0 d, S' I# { set energy energy - 1
! E6 [& H3 G9 ^) Z& e3 U- ^ ]3 V7 g; w$ t; f) p- k5 A0 @) ^
end
$ X, h& Q6 }" N" k* a$ s( ]+ |to setup-patches0 M; J# J; U* f$ l& e
ask patches [ set pcolor green ]# S3 g$ Y* t4 w: E( `6 C7 Q
end
) g' K& S+ I; l2 pto setup-turtles* g! ?" @/ f: ]3 O. I8 y6 x/ g
create-turtles 100! m; y( Z n6 S" [5 P3 E
ask turtles [ setxy random-xcor random-ycor ]
( E# i5 ~: {# Bend
0 o+ k( V0 z/ {2 U- E3 _! E2 X) G4 vto eat-grass1 {. f: a5 b `2 R
ask turtles [' e! e" o) k, ]3 l( F
if pcolor = green [! X3 Y! \" S s; t, n! g
set pcolor black
& \% l6 S/ W" m+ ~! k* D set energy (energy + 10)/ Q0 Z _/ ]. }6 I7 \/ y
]
4 t# T" a" a* w- ~2 Y Y ifelse show-energy?* b# p0 @& i1 k$ g% R% e
[ set label energy ]$ b+ m$ I& ]! m
[ set label "" ]
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+ s) X9 }) q; ^3 a) @& Z, Lend
) F0 E, V8 \# ^$ hto reproduce
d6 @; E. b; Y. u+ J ask turtles [3 o* ^6 x# A1 W9 {' E B* N: b/ I) B1 [
if energy > 50 [5 v3 B( g [ v5 e) }
set energy energy - 50- f$ @$ i0 U( S; x1 e0 k
hatch 1 [ set energy 50 ]
$ B1 J$ {5 N e5 n9 U- } ]
8 q6 ?4 p9 d5 o& l( N ], z7 Y4 W3 m% g0 j, f8 V5 A
end. s3 {3 P4 |% _$ p3 ^ k+ P% V& V( L
to check-death
; ]- B% [! h7 s( _7 A1 p ask turtles [
& d' `7 b! ?5 L, u, }# d6 |0 c9 N if energy <= 0 [ die ]2 k/ S" N8 B. l C
]9 k, O' l4 ?$ g! S: |6 ]0 a3 A
end
3 @! E9 b' I1 y* |" U* r) uto regrow-grass
7 Q0 S7 Q* z+ e8 R% i ask patches [$ {* K( N0 G' R+ F9 n; T5 Q U
if random 100 < 3 [ set pcolor green ]2 H# P: z" G5 r- L& x0 X* C; r
]
$ M& L6 `8 D2 e$ _$ X* vend) ^6 Q( J# H- o9 t6 j2 f
to do-plots: a5 {' j) ~ @: O! D
set-current-plot "Totals"$ e% F" j2 D) u, z! q
set-current-plot-pen "turtles"
: M$ p6 @8 N! ]* R' N plot count turtles. z* _- O, h0 l6 c, E; P
set-current-plot-pen "grass"
4 Q& l# k/ Q2 w% }, c0 j1 Z- E1 G0 S plot count patches with [pcolor = green] N# f# u6 b0 H, J, g: \, h
end
[" i, E% {. a- V" R) V0 q可是运行时提示no such plot: "Totals"& T' ^) d* T2 _2 A. G
error while observer running SET-CURRENT-PLOT* [+ E, e! f0 j1 d4 k, _
called by procedure DO-PLOTS1 T" B9 ]- M9 c$ g1 g4 W6 ?
called by procedure SETUP
' K4 P" Z# w& S called by 按钮 'setup'/ W' B) P' N2 ?8 k4 x5 t
求大神解答啊 |