我编的程序如下turtles-own [energy]1 |0 c' G8 B& |- I" J0 I4 X% U
to setup* |3 i. s$ P! J2 y
clear-all
( s. X/ n# t3 x8 N7 e setup-patches% }3 W: p7 K, ]! a! D& a, n
create-turtles 100
2 a/ o# Q; X, H! ^& O do-plots
) C+ E( m' R7 o( X) r' r ask turtles [ setxy random-xcor random-ycor ]
% N6 G" Y& n: pend
) U" r" a0 o5 `6 f+ u: Eto go
8 S; V2 t7 f7 N, f move-turtles
0 W% G3 i/ _. o* l eat-grass
- ?9 }2 O/ X3 r reproduce" n: ?( A8 Q. w7 T4 v+ F
check-death Z, `( ?/ T1 }# O
regrow-grass' ` o8 P8 r. ? h0 \' f
do-plots3 u5 ?/ x8 X' ^
end
2 s2 |; F7 J: \8 ^to move-turtles
5 `1 @- u4 m. m( S* w5 v ask turtles [
3 R3 F! g1 y1 k& m4 [% j' `6 q) [ right random 360$ Y0 O0 c, Q! \6 F4 x! Z2 E& i
forward 1
6 g5 a, v( N# [6 b: s# ]+ W7 H set energy energy - 1
; h) G* A9 |- P& j, {9 P7 | ]
1 [1 _; {# {/ ~- W$ E: Q7 m/ A: ~end: W' w. F- @* w8 J' f
to setup-patches
; A0 G+ S/ E/ |) E$ u3 A0 H ask patches [ set pcolor green ]) S k3 A5 ~! z. B6 {* _ z+ }
end8 s i6 o o4 w% ?: O% G# h
to setup-turtles9 a: U$ Q# e% I- u+ V# k* k
create-turtles 100+ I) g& J t# N u' Q% ~
ask turtles [ setxy random-xcor random-ycor ]
& g, k }% {' z0 oend# X2 t7 U* z: z! [8 a
to eat-grass$ V1 b4 v3 ^6 ]
ask turtles [
% S9 i X$ @6 I$ K* m/ P& ?, E if pcolor = green [
; l1 J1 L9 C1 e; `" v2 l; u set pcolor black1 {4 I: ?( d$ ^; `2 t4 Y
set energy (energy + 10)
! ?6 g5 H" E6 w/ x f6 L ]
3 k9 k O7 a9 p; c/ P ifelse show-energy?& h2 c: Z. {2 f( [
[ set label energy ]
" x1 [3 v' `, f+ ~) w! Y$ P& o [ set label "" ]1 _" f2 h0 ]9 F7 ^
]/ i4 @) {; d4 w/ B$ F
end( t0 e3 @4 ]) ~8 @/ j8 S! h
to reproduce) p' z5 {4 t5 z2 ?. [0 c* D/ ~" a
ask turtles [2 }( G. g" ^, [& S4 k) y
if energy > 50 [
M; ?% K" }; h8 e set energy energy - 50, H3 Y. a1 J2 s0 }% C
hatch 1 [ set energy 50 ]
3 x& L6 z2 ?3 B9 @! \! O7 o3 C ]
8 n& H4 c. {( ] P& { ]
/ M6 u7 a# ]8 B5 h5 B* o' I9 P6 wend( Z! |; H# S, R% `0 K" h4 Y& ~
to check-death
- O6 l$ U* y, \6 E9 i2 J" g ask turtles [+ W+ z- }8 a, n. D$ @
if energy <= 0 [ die ]
8 N. r1 }0 V8 @# B, H( \3 x( | ]3 i% m' Q+ n+ W, D7 H
end. d0 g& p7 I# x; J( T
to regrow-grass
3 `( T9 r$ r$ ?- { ask patches [
, |1 ]0 L7 G, \" H6 j- P) m if random 100 < 3 [ set pcolor green ]* {% I- ^: A. b$ \6 |7 y1 W- L
]$ w2 C! ^+ W1 ~2 J
end/ ~! c1 q0 _9 G M
to do-plots
7 S- W. v" e' x6 q, u! v9 q set-current-plot "Totals"
! c3 Y# C! B; y0 ]- r set-current-plot-pen "turtles"3 r- y6 h* F. p5 S% T- q
plot count turtles" h! X N0 t/ i& F2 L
set-current-plot-pen "grass"# F2 N$ K6 N$ o5 t9 Q4 Q) f
plot count patches with [pcolor = green]
$ u0 ~# V9 o# @& J9 t9 Wend
4 k+ g d2 e2 `* O, R7 H/ }可是运行时提示no such plot: "Totals"
$ B1 D) I9 b& R2 ^/ ?9 b3 o8 uerror while observer running SET-CURRENT-PLOT
! K# W# X. C) X" U called by procedure DO-PLOTS P7 X8 R% q" t8 R- N; I
called by procedure SETUP- t7 J6 _, I; i, F: X4 V* l
called by 按钮 'setup' [4 v1 R. W- Y( W) p, I
求大神解答啊 |