我编的程序如下turtles-own [energy]
, U8 E3 ^- E3 y% g& s# ato setup# y2 Y v6 k+ k
clear-all8 U6 v) p4 [, p4 m6 j! u
setup-patches8 m. l0 ]1 \% U" }/ e
create-turtles 100
0 }9 H Z* n+ T: I+ x$ O" O do-plots
9 }0 c8 H5 @. v W ask turtles [ setxy random-xcor random-ycor ]5 f0 c" [% n9 Y1 i
end% P3 p5 x: ` z% d, H3 v
to go
' {' I; K# {3 O' b move-turtles
/ A D0 I$ h2 B. Y# J eat-grass
. {$ z1 X9 m V( W$ | reproduce
& }/ T5 l7 {+ ]1 W check-death
0 B( s4 b% n$ R$ P4 w: E regrow-grass
" l1 N5 S# g* Z; d4 L do-plots
2 x1 \0 q! a# @8 [end9 C3 P: V7 I9 _
to move-turtles' D, {7 R' S$ J/ a0 _3 S
ask turtles [
' H' P" k; N! _5 L/ Y right random 360
! K% Z# Z6 o. F. l! P, |5 Y b. O E forward 12 n0 G8 u1 b" o4 A* C7 K! B) f5 j
set energy energy - 1
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end
4 F* N! s& Q* L& O9 R6 r/ pto setup-patches
) \8 j" Y; F; u7 E, [- P ask patches [ set pcolor green ]9 j+ V* p& `$ ^, | v$ t( U
end, r w0 I- p9 Z+ s6 z
to setup-turtles
7 {% f6 {0 C9 m4 c+ J# z create-turtles 1006 m# V7 K0 v' q9 n* u$ Z) p* p/ M
ask turtles [ setxy random-xcor random-ycor ]9 M H: ~ f+ g$ X* v8 r$ h/ V
end: S" U0 ]5 D8 G) z4 M3 b8 ?0 \$ {7 K
to eat-grass- x# n9 z, ?. T p' P% i' F: p. s
ask turtles [
* _" p- I% i3 U8 |' i8 E- D3 C if pcolor = green [# d: D# W! c; u/ p4 [
set pcolor black/ W' K4 g3 P. V* R m
set energy (energy + 10): J7 n9 V/ f9 b- t$ y
]
& _( N8 f5 T9 z; c0 h8 j& Q' { ifelse show-energy?- C9 [ X; i' t4 }
[ set label energy ]
) z) R$ f. T5 k" s7 r- s/ n5 r5 Y* R [ set label "" ]6 L* t0 D/ W) ^0 D% i$ G- R E
]/ X+ p5 _" c) }6 s+ s
end" b" \7 q/ _! M6 O( w" `
to reproduce
D- E" \, M5 J, E$ A9 s ask turtles [
J5 F$ C! p X4 c if energy > 50 [
; ^' ?# H% a! G$ Z' T! b set energy energy - 50
2 T; Z( r- M2 }6 n+ A: b8 Z: z hatch 1 [ set energy 50 ]) C1 D; t: m; e* |1 S. Y
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]
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to check-death! o" [; O8 I- v; L6 y: {
ask turtles [' j5 C. E. u& r6 j h2 K3 c
if energy <= 0 [ die ]
$ u7 j; S4 D; O ]
8 g5 p2 Z& f+ m' _/ d* \! M" _end5 x9 O' w: r+ t
to regrow-grass7 G2 l5 B# B1 e; [
ask patches [
& [. V( f, D }9 p if random 100 < 3 [ set pcolor green ]
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end7 C/ }. d. ]8 B/ U+ S
to do-plots P& Z& j. f0 D$ |8 U0 C4 `8 c
set-current-plot "Totals") `# Q% e& W7 p4 q- E i/ G
set-current-plot-pen "turtles"$ L' K' n- E) {! V- Z5 A; V
plot count turtles
4 \3 \# e E F+ Z M6 r/ e; q" _ set-current-plot-pen "grass"4 U) r. L0 e5 l; \# h1 z
plot count patches with [pcolor = green]/ ?, w3 J. e' W4 l8 T W
end6 l5 B- u" M2 I/ ]" U3 Z' \( E: \- N
可是运行时提示no such plot: "Totals"
5 H U" i& ?+ W" f$ G5 M& ]% `; w) a7 cerror while observer running SET-CURRENT-PLOT
9 [* k+ o( W5 E) l called by procedure DO-PLOTS+ M/ d) x/ ^: Q q
called by procedure SETUP6 T! e4 o, ?6 e/ K+ S3 ?; F5 l
called by 按钮 'setup'3 o# Q$ j/ k- W. M+ O3 d
求大神解答啊 |