我编的程序如下turtles-own [energy]& m$ k; C+ s2 W; F5 j+ n% E
to setup
, u8 C: x8 u4 h) x( { clear-all. |& T0 R) N% R$ Q; S$ n+ }
setup-patches. @# V" S; k: y7 v0 T3 Y7 J* M: @
create-turtles 100
! L9 f' X; t( G do-plots
+ x/ O o6 a9 z# t ask turtles [ setxy random-xcor random-ycor ]9 \$ [3 T+ M$ a; Y3 C
end
1 s9 [! c: O' h2 ]' ?/ cto go
" _+ E5 a; q0 n# I) c move-turtles
1 V% u! W+ T" I0 Y eat-grass
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check-death
4 e9 U8 G$ \4 I" K- S regrow-grass
# ~/ }. F, M/ m% I do-plots
- X: w7 x, E" y$ k) W0 ^end
9 M+ l$ E. a) z7 ]7 D: t5 O xto move-turtles- F$ x7 ^, j8 ^! U5 o, ]; d3 |& \
ask turtles [4 ?; I3 ]; |+ h/ x& m
right random 360
% w( V R% l, ~: |9 F" X3 L forward 1
1 q% j% g9 T4 A1 }3 y, L set energy energy - 15 Y% q: g- L. I5 V9 z1 _
]- V2 R* h5 K0 {" \
end# t- c+ m& y6 F
to setup-patches d2 K9 E4 ^; \ }% E5 M6 F
ask patches [ set pcolor green ]' K4 s+ }' O1 @8 l, o
end
9 N5 T& S( J7 c, Z: [to setup-turtles
- O4 B8 ~4 l$ V6 ^' e! Z create-turtles 1002 r* M, o7 N9 Z3 P& d4 R, N
ask turtles [ setxy random-xcor random-ycor ]+ \9 j1 y. f5 u
end: p1 g- H+ v+ I) K+ f
to eat-grass
$ r/ Q! w- m% ` ask turtles [2 ]5 a% y' z+ c5 B- [! F# u
if pcolor = green [8 i3 M0 q* F5 H9 P9 n
set pcolor black! M# Y: `, p( o1 q0 _7 Y
set energy (energy + 10)
) O0 \6 |5 y$ Z% q5 q$ x6 t ]
2 ?! K# n: L7 `7 a0 v7 J$ G5 _- I ifelse show-energy?
5 x/ O; `8 E2 Z, t; O [ set label energy ]8 ~+ K: }3 ]% R2 b& R
[ set label "" ]# C2 p0 N9 Q( v
]
+ Z, l6 B) Z( t9 V- e, K! \end5 h5 F5 J# u0 M& \3 V% ]
to reproduce
" Q( [0 V8 a% ?$ ?4 n% G2 a0 R ask turtles [
" O* x0 E6 X0 P- B" s2 W if energy > 50 [
+ J0 Z, ?! l" I set energy energy - 50
7 E5 h! E" j: o! I- g) M hatch 1 [ set energy 50 ]
- E; |) p: E8 p( u0 O ]
! `/ f& ]" v6 C1 O ]
6 h, v+ Y7 [5 ~; ^4 ~end5 [0 R* ?* ?+ x
to check-death( d- E: H1 J- O4 s0 x. `5 ?
ask turtles [, U+ u2 F# E' q+ o4 k( W: _" \
if energy <= 0 [ die ]% L0 P4 X8 }9 I% i0 i! C) _
]
a9 Z# [8 E0 R# s" j" Mend8 l. J$ i2 m3 [
to regrow-grass
& H- ^% g6 M6 u$ f# w) x ask patches [
3 R; X! o; _+ F7 a& l% S4 R if random 100 < 3 [ set pcolor green ]
5 J a% {3 W+ G8 U k ]
* t: G# y9 v2 A+ N0 gend
}- q$ i/ X# Z% D4 A3 oto do-plots
: Z, I) ]8 I. l W& R' E* T1 } set-current-plot "Totals"
2 g5 E9 ]! h" Y1 l set-current-plot-pen "turtles"3 w, R3 I( h- N
plot count turtles
& c! Z6 ?/ T# n$ I set-current-plot-pen "grass"
) [5 I- M, m* k8 J3 J3 Q% T plot count patches with [pcolor = green]
; ~: c/ `# R+ ]* tend
+ C, B% Y, l4 }: G7 r: N可是运行时提示no such plot: "Totals"
# h1 P% E; G! nerror while observer running SET-CURRENT-PLOT
9 o( M2 \7 x) O5 l called by procedure DO-PLOTS- I1 S' e+ G1 T" E1 H
called by procedure SETUP
! I6 y) x2 p( `, ~$ Y called by 按钮 'setup'- z8 w5 q/ ]6 X1 J9 L4 v5 C y
求大神解答啊 |