我编的程序如下turtles-own [energy]
" Y- a# t; H! X/ n0 G5 F. a# yto setup
1 ?* V+ N8 e) r) \/ z clear-all
8 j" f/ ~9 P; O& X' \! r setup-patches
, w$ A2 u* y3 P) \! A create-turtles 100
9 K" J! y# n3 p, q3 J do-plots2 ?+ b0 U$ }3 V! ?/ o* ^1 I
ask turtles [ setxy random-xcor random-ycor ]" i1 g. `! E" G( c
end
% p( |$ Y" X& r3 Oto go
_* r; s* `! c6 s1 q, K# J4 T2 M move-turtles
# e- d1 r) u8 @4 E eat-grass8 o- o* I2 c/ Y4 p$ a* {
reproduce
6 E3 f& n" O0 k check-death
- M4 g3 L) i5 y+ w, S regrow-grass
- a1 K& l J L4 q0 U0 I7 }/ n do-plots
8 [: j' d0 O; A* B# n& f5 vend
$ m3 `2 a) z. a, J+ o8 ~: M, eto move-turtles \6 W" B4 m7 j! _3 u2 O" z
ask turtles [8 _# ?) Z( u- D- _
right random 360
( v0 ?$ H- D. Q1 B forward 1
" E" }7 d5 z \ set energy energy - 1
$ n. s. i. d) g5 P ]! V4 q1 n- d* H, S$ n9 q
end
) L k. k' J- E- F4 Zto setup-patches
2 E% ?1 C- O- ?* o3 P3 t ask patches [ set pcolor green ]0 m7 g; _6 ^& p# r9 v
end
6 s6 S+ x) L* D7 R( ~to setup-turtles
9 w7 D1 B4 _5 M$ g create-turtles 100
+ `9 ^5 Y- {! f8 t5 W4 O4 M z$ j ask turtles [ setxy random-xcor random-ycor ]
8 ]( q# l: @" i$ v( Tend
% T8 x2 b9 ]& l) [% eto eat-grass( d5 Z4 `. C+ q7 p2 X0 o7 U# q$ b: J
ask turtles [' `: u2 J' E5 X
if pcolor = green [
`" Q4 E/ S; L) r/ R# J set pcolor black
% k# a& }' _8 |$ G# E7 v* j% f set energy (energy + 10). i8 u! N7 \6 n* m
]6 g( w/ l/ h* a
ifelse show-energy?! A+ |* K) r, T8 ~
[ set label energy ]
* v3 t/ D: @+ Y3 S& o+ p5 Z; v [ set label "" ]; B+ n. ^, `5 N- p
]
( P1 D& l% v* d7 ~/ v8 ?6 ]. ~end' P! p: o- x" L0 I4 ^# H+ a4 J
to reproduce
~4 @) p- Z+ `' P0 `" n8 b ask turtles [- t! p9 L0 p+ ?; T: K; \
if energy > 50 [
( |5 L M" a" r& k. a8 F, q set energy energy - 50
\, N0 u, |' e* m! w hatch 1 [ set energy 50 ]
8 W9 y. x6 G$ y% P ]" S+ o5 P6 N+ ~; R' P# N* {
]
; j$ _# Q% a) s# S' E5 R6 Gend
0 M% k9 U/ G% u4 P5 s' C4 K$ ?( _to check-death
; L2 ^/ g9 _ I/ D" U ask turtles [
6 G9 m" S7 W( y+ w8 X8 B if energy <= 0 [ die ]
& `! a! R4 x+ i% U ]& Z' ~6 v% ]& c" x: I
end# {0 P, H7 z+ \2 R% z
to regrow-grass
4 }7 k3 E, B2 ~8 t: L. V, K ask patches [
# z. W- {# F+ A6 o, n# l, X if random 100 < 3 [ set pcolor green ]+ |- O! D, J# [: g8 Q( {
]4 {% a/ P2 D" w" I' r
end2 o( u8 e* T1 b; e, q
to do-plots
f$ U0 a2 `6 l set-current-plot "Totals"2 Z- q0 X8 c6 W, _9 |9 g, w
set-current-plot-pen "turtles"
" m6 d4 N, l+ z/ t3 }7 j: ~% N plot count turtles3 j" `0 s' V2 q$ ^7 k$ E" S
set-current-plot-pen "grass"; {# q: E0 Q- l4 S
plot count patches with [pcolor = green]
+ U! G) j# i' t3 E8 a+ K7 ^end6 G9 i+ n# _" ^, a# @% }# `6 u/ m4 B
可是运行时提示no such plot: "Totals"
7 R3 F% l) c6 Kerror while observer running SET-CURRENT-PLOT
- }) {4 t( T' C2 m" j! A called by procedure DO-PLOTS
2 F5 B# R- j+ x) X1 ` called by procedure SETUP
0 h' t$ _: J% S% v$ n* A: S8 f called by 按钮 'setup'
7 S- O. q' q0 n$ T7 I( ^- g求大神解答啊 |