我编的程序如下turtles-own [energy]# j' I+ f% G% N. e R
to setup
! H/ r0 s3 s: ` clear-all
' A! A0 G6 ^1 c" t1 E& n; F j setup-patches
9 z- j# d( A4 `# v- ? create-turtles 1001 w% i( D4 Y+ P# ?, x u
do-plots* `! R. V% C+ j4 i$ S
ask turtles [ setxy random-xcor random-ycor ]
6 I- A1 ^" b4 b2 y. B/ s8 oend
5 r) k1 c: p' n8 T/ s# w6 X. Pto go, {; u; m1 i+ u; |# X& r" A0 j
move-turtles
- m( Z* F/ }" ^& B6 @/ n eat-grass
$ ^4 T: [2 k; F. U. k& g reproduce. b6 n# C, ^/ b
check-death
* z2 E Y1 J1 f. j( I regrow-grass
$ w. J- k; D H, O5 | do-plots
1 e2 h1 S: S: Y6 m. Gend2 z0 N' S0 }: I* S; x8 @' j
to move-turtles
: q y; r1 D$ O7 } ask turtles [0 T! q4 f7 G: b0 J F
right random 360
. B, I- e# ^. F4 E$ [ forward 1
# H' r% F' b& Y3 B set energy energy - 1
D' I1 I: q5 h3 o0 f ]
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to setup-patches
) ] p0 E% h9 P, m9 T ask patches [ set pcolor green ]* N' K# x4 J9 }+ V# X
end
6 {* E: Y9 F" r8 s9 U/ ^to setup-turtles( G( f+ [/ v4 X0 O- Z
create-turtles 100
7 I, y% e. H: U2 @6 s ask turtles [ setxy random-xcor random-ycor ]
8 [/ _1 }# ~5 Pend
; m0 G4 t t$ s. Oto eat-grass
1 v; A+ M3 E" k+ u" G ask turtles [; o5 ~* C, d9 x9 j9 B
if pcolor = green [. U& S4 m' A4 N# C' B: d! c U# [7 b- ]
set pcolor black/ W- z6 r9 P# U4 x6 o
set energy (energy + 10)8 A1 X t- T- c% M1 j: T3 F4 t
]
1 X$ G, ?) K0 o ifelse show-energy?+ h% h) v" e/ O
[ set label energy ]
! p2 ~6 \( Y4 W, ] [ set label "" ]
R1 H0 n$ b, F$ f. d ]
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to reproduce% N/ o1 a! P, i9 y" k4 T( h1 Q
ask turtles [9 V c% S$ n% N$ Z2 I5 ]
if energy > 50 [
- j6 u/ W0 |% p/ ]- c$ R set energy energy - 50
9 r' Y3 ?$ o- T( m9 G) K; S hatch 1 [ set energy 50 ]( T" S8 \+ @- o, w( |
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]
! ~, R0 s6 ]; A) |9 cend
3 Z5 a2 h" ^( O3 K, {+ Zto check-death' V8 |" U: Y% J! ?$ T
ask turtles [6 Q5 L9 c1 ]: P& e1 O0 s1 |5 B
if energy <= 0 [ die ]
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0 U @' D8 P6 J: O- N; r$ Xend
2 u a. I2 F1 i2 r* Y! t9 Fto regrow-grass; F8 P/ r. p3 [9 ^7 H( d) a6 |- }
ask patches [2 A: n) J, i2 s8 i" ?
if random 100 < 3 [ set pcolor green ]1 Q, I* \# P. P& w
]- y0 z* o$ V& ?$ V! F4 I* \2 M
end* y( ~ O: @* \- g
to do-plots, m1 l: s5 Z5 N% p5 j1 J/ e
set-current-plot "Totals"
% v. ^. F% ?6 J8 | set-current-plot-pen "turtles"$ y! B; ?' V' X) q) w
plot count turtles
! ?% `9 ^, ~/ |2 } set-current-plot-pen "grass"0 V; `/ B9 b9 B U* O
plot count patches with [pcolor = green]
) A' {! Y5 [) t( W3 @0 s; Vend
8 a3 P O' w5 G$ @( S/ b可是运行时提示no such plot: "Totals"
% I, L5 q* ~' C ]error while observer running SET-CURRENT-PLOT
: i& C6 L; i6 i; t called by procedure DO-PLOTS
) ~. j: F, I2 n* G, i' i* W called by procedure SETUP
i8 z+ V2 Q( S& e% N% ` called by 按钮 'setup'
* n0 Y6 E4 ? {7 X求大神解答啊 |