我编的程序如下turtles-own [energy]
+ w" U7 X: _7 E0 Y! Z1 K; {to setup
7 n g+ p! l( w9 ?5 w z; `! W9 A clear-all
0 G, T" _2 y6 L7 P1 v& D setup-patches
& t7 {; ^" m+ z& v1 C create-turtles 100
9 N8 K! @& E: s5 f8 V' \: N do-plots" X6 _! X( P5 `- i
ask turtles [ setxy random-xcor random-ycor ]
# ?) x& O- T- C: N# y, \$ G; iend
0 @* h. a- B% Q' b& I0 s$ ~to go
0 P5 U1 `. `8 [- B& U; }/ _( C move-turtles" s6 m/ g5 O' g
eat-grass
1 g- K, H2 J5 X# t( P6 C- x& p" T reproduce
2 O; x1 X- D0 F+ ^! J' J& w: C. } check-death
" y+ B, Y3 f7 D1 U regrow-grass
, s3 k; E" e P' p, L% r4 l8 ? do-plots5 t" W( I0 i( l# _, i/ n) Z) g
end
1 N3 |3 c$ H( rto move-turtles
' O8 B a5 ?3 U; W ask turtles [
9 n# d2 v: g+ `) u8 Y right random 360/ H1 k* F) m% E1 r
forward 1, o [( j( C) n; g
set energy energy - 12 s7 h6 i" Y6 r
]
4 j5 T: E6 y$ H, rend
3 w( \8 K$ O- ^0 _: Y$ K/ K# A4 sto setup-patches
: ]7 H" y) ~( ^8 Q; X5 |/ T' S ask patches [ set pcolor green ]% F& U8 R8 T8 E
end
' ]# a3 F# ~. e! `* q/ P* _9 Eto setup-turtles0 z" _% z" a- S& k
create-turtles 1005 ^: b, j1 ]8 B" Y) T6 O
ask turtles [ setxy random-xcor random-ycor ]/ O1 e8 K4 [: t: O
end
" f+ g& r: B! E- Xto eat-grass
t2 O, ?- n( C( c. h8 V ask turtles [
. S5 x1 W% ?6 b2 w if pcolor = green [
`- v1 y/ z7 U. \8 I) Y" B, @ set pcolor black3 H4 g& i U1 @& E2 U1 |
set energy (energy + 10), M6 D8 e# D+ m" O0 F4 _
]0 D+ j) U. n) K% w, V' [
ifelse show-energy?
1 B5 J! ]% d- Z: Q- F [ set label energy ]0 x6 f! h4 x6 I4 [0 H
[ set label "" ]4 X3 Q0 K' @0 Q( u5 l7 I
]
7 U7 [: Q; y1 j! ~end
6 b1 i/ z) U. Vto reproduce
1 u0 {) j" ], f6 m, x ask turtles [" U' |8 z; k% b0 I6 D4 R
if energy > 50 [
/ I* q6 @4 n2 @2 f% H6 V6 I# v set energy energy - 50! Z+ e% m$ {9 A9 ^: |* v
hatch 1 [ set energy 50 ]: O& d( u" P$ T" Q* d- D
]
. H0 Y" H( _2 y9 r0 k8 C7 A ]/ M7 z1 x9 x' r. M; W) h" J
end. T$ L8 A6 v# d# ~% o9 v! A
to check-death
) r. w% C, h) V, z ask turtles [4 J! b3 }& P k& y" G1 K
if energy <= 0 [ die ]
; [" D- w' h) m5 {# Q ]
- _( J2 F* b: f/ v0 Bend
0 F. z: {2 B9 xto regrow-grass
9 w% l+ C2 s# L ask patches [- r. k& n; b$ c6 c3 M+ c. P
if random 100 < 3 [ set pcolor green ]
3 Q8 o% @# k" l1 l ]5 C) z5 x, q5 x. E; `% j! a; E5 O
end
) Z+ s! R# S" d3 `to do-plots0 F: z. X# P. h
set-current-plot "Totals", n' Y8 q. r7 s: ?2 b" r6 e
set-current-plot-pen "turtles"
% R8 D1 s/ C' O plot count turtles
, u$ e% {4 Q0 A set-current-plot-pen "grass"
2 X% {. J2 n+ @0 M, a plot count patches with [pcolor = green]2 K2 w9 r- u0 n! s, U' ]
end
, ^& x }8 D" |6 d b7 Z* `# W可是运行时提示no such plot: "Totals"- I! I& c( d' L/ D/ f& w
error while observer running SET-CURRENT-PLOT. z, t2 T, L5 K, p; w* P/ M7 N! i
called by procedure DO-PLOTS
6 P. l$ @' }9 P7 }8 w: _% u% v/ S/ U called by procedure SETUP0 z4 {3 D+ U, T- k5 Y2 p! c0 I
called by 按钮 'setup'
* ?% H, V9 `7 U0 I2 Q8 D% @5 a' V4 u求大神解答啊 |