我编的程序如下turtles-own [energy]$ `8 P% ^4 m- Q; g3 X/ a2 s: ]
to setup
N/ E/ a5 T- F; O clear-all
: c8 E9 u E* B: y) q; A$ e setup-patches
( e% o( I& Z" f6 A J0 B create-turtles 100
9 d! q: q& H: s1 _6 S1 E do-plots4 K ^# R4 x1 O- f& ?
ask turtles [ setxy random-xcor random-ycor ]8 P3 l9 {( T6 G l* I) K
end
! Z0 h4 e' E0 T( G' w7 }% O7 _: Uto go
V% P. u7 U/ V1 f) r q move-turtles/ o$ l2 R0 q% J5 Y
eat-grass
9 C; j: @8 I* `$ M8 E reproduce8 p2 C5 `3 q1 J4 r- i
check-death
# f/ `5 c L$ K* z* s+ ~# y. _ regrow-grass
! i+ L' @$ V9 q0 M do-plots" {% l5 g+ R( I) h3 j
end2 }' _" A: v9 L
to move-turtles, f* ?, c! S# G$ \( Q3 L7 e. B
ask turtles [4 M) j Q, k# d
right random 360( u7 g7 O% M# l# f9 _* T+ D) i
forward 1
! ]( X# v" s) l3 B& ^: ^ set energy energy - 1
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$ s5 o/ K, Q# t: K4 Fend
$ B) q0 Y; ^, g. `to setup-patches
- q& P6 @. x- Y, f, o0 M, i# v ask patches [ set pcolor green ]
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to setup-turtles
3 A( m6 H5 t7 `, J, I- j6 F" C create-turtles 100# Z2 w7 r$ r# p0 S4 u7 k n0 K
ask turtles [ setxy random-xcor random-ycor ]( q/ |& H) f4 e. [
end6 ]# c& k+ x! l; X" E( Q$ R. ?
to eat-grass
& M2 t2 ]. F' `7 C* F3 ? ask turtles [
. D& B! h' K4 i; r& O if pcolor = green [
5 X7 p4 k/ S6 g8 a0 b. r! s/ ^ set pcolor black
! T z+ L5 p- L7 b; r0 ]: G set energy (energy + 10)
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ifelse show-energy?9 B0 E8 B- M: l( T# t
[ set label energy ]4 m! {* }: C, n* R9 N8 U) E/ \( q
[ set label "" ]
/ X" ~! P, Z$ W- ~1 i7 K+ D. } ]
/ N: y7 G, F5 E* Q/ s* o, Fend
, O- \/ ?6 ]* M( d$ xto reproduce
g) k% E: H& G( W$ S6 } ask turtles [' F4 R# Y& S9 z" Y. q/ ?
if energy > 50 [
+ x/ N8 q5 Z) r' w# l1 M: H- s set energy energy - 50/ R" \6 ]3 E1 D: G; r$ U; X
hatch 1 [ set energy 50 ]
' N. r" d V( v ]& B. a L7 N% f0 L! Q
]2 }' {1 w' }8 q" Q+ P
end' Y/ \) y, h9 j
to check-death, ?1 ^0 a; {8 q3 D. o" R- G6 D
ask turtles [5 X% H* O* W7 M- s) b
if energy <= 0 [ die ]
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end
3 T( ^$ m% W: X5 h* J: Bto regrow-grass
- _4 H4 L. }' x0 j ask patches [. T7 u& k# q P9 m
if random 100 < 3 [ set pcolor green ]
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end
D" s9 k1 S) O* z$ c" j; X* Hto do-plots8 c9 g$ Q5 _' ?+ B
set-current-plot "Totals"- t, r# O( F6 {) x
set-current-plot-pen "turtles"
# V$ H" k* ^. z- W7 h plot count turtles+ ~/ w `. j' X
set-current-plot-pen "grass"7 W, }/ A( Q6 c: g# w4 k
plot count patches with [pcolor = green]9 m: |# D- c+ n
end
* S2 g% ~$ j1 R可是运行时提示no such plot: "Totals" v# d8 l7 I$ f! |
error while observer running SET-CURRENT-PLOT
% ?. T" }. Z! Y$ ^9 L& N# y called by procedure DO-PLOTS( V; Z) [$ [$ p' o6 y0 [/ w
called by procedure SETUP
, a. v7 G% e' z called by 按钮 'setup'
4 L; I6 f8 @5 r! u+ k5 ?6 t- W& j求大神解答啊 |