我编的程序如下turtles-own [energy]
; h/ I- `8 @2 E* f6 o- X0 u2 `to setup( T: Z* ^4 f$ n$ q
clear-all3 f0 b C$ h& ^+ l
setup-patches
5 x6 _' M: @) l create-turtles 100
5 t5 _7 u8 z* ^4 N do-plots& z l$ K6 E' }: W5 b3 p7 |' L
ask turtles [ setxy random-xcor random-ycor ]
$ a; K+ I' S- Y4 zend
8 T1 v; Y) ^: C+ p& ato go& ~+ y6 D3 v: B! y3 t
move-turtles+ Q1 T! h! k7 c4 @
eat-grass
8 V& s3 n/ Q3 w- ~ reproduce/ H0 J2 ^* N o' ~
check-death B& ?6 R) ]) ]
regrow-grass; M* ^% o5 y+ a
do-plots
0 d) I1 `; ?9 D Oend4 W# Z8 z# s1 d
to move-turtles, ? Q0 m8 K" k
ask turtles [# j* e+ L# I0 |, A8 F: N
right random 360( `, Q9 _6 B+ j* `9 s% S
forward 14 A! G8 T% W* ~7 z* }, C( J) f% M
set energy energy - 1. K# D6 |: `2 Y' R8 \3 ~' a* k
]
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to setup-patches( U* d. W4 z5 U& b' V8 F
ask patches [ set pcolor green ]
# ~* ^; K2 g% Vend
: R2 Z) ?9 n/ }& T9 s. }to setup-turtles& N; v: K# o8 } S n' _- p) `2 [
create-turtles 100! X( N; n6 Z+ T; j+ o+ K& Y
ask turtles [ setxy random-xcor random-ycor ]! O6 h# Y' X6 a2 R6 a4 k8 y
end+ e& w) G" e9 T4 r- d
to eat-grass T9 ~+ w, h/ R; N- I' {
ask turtles [
& e q8 h5 u& x* ?2 d if pcolor = green [
9 w! x5 l) o5 I2 [ set pcolor black! u( m- P! D( i I8 E" H
set energy (energy + 10)
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ifelse show-energy?" A) z/ o7 L: t6 B) E
[ set label energy ]
q1 L" q( Y; M. R# D- O6 I [ set label "" ]
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+ Z0 S2 m- s! b; Cend
( t. J/ Z+ h2 W# ^to reproduce
; g" e% _( t9 V: A( ]% W ask turtles [
4 j8 ]* }% z' E if energy > 50 [$ ~7 B+ O ?! W
set energy energy - 50
9 ~% |( |2 y7 R0 r9 }+ { hatch 1 [ set energy 50 ]
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]1 y4 C) S9 A E# Z1 ^
end4 B9 p* b" j7 z% e% n2 d( V
to check-death8 q8 D" y) M* A* [, a; @- q
ask turtles [3 r1 `$ Y, R" ~( c4 q' j4 q
if energy <= 0 [ die ]$ a/ _% V- O) q6 f5 Y; f" S; s$ n
]
2 h0 X- b) M, `2 ^' b9 Eend: X) ?+ i/ `. D5 G/ J2 |! Y
to regrow-grass9 y' v( a, s, T+ _2 a3 U
ask patches [
6 g* `8 v0 h' F! U if random 100 < 3 [ set pcolor green ]* G3 h; c* f1 J) \5 W
]6 x; f* a- R3 A% t s0 Z! a
end5 b+ J! L5 {3 B5 g$ X D# E
to do-plots6 X; v* {" z2 I7 x, z c$ A
set-current-plot "Totals"& m, d9 B5 I) Z' w2 Q
set-current-plot-pen "turtles"
u- k( B) K6 T% l" F% c plot count turtles
! z, t5 u* d6 r8 x C: P' y- @ set-current-plot-pen "grass": m/ Y F# w/ l5 I+ i+ @, e7 e6 E+ z
plot count patches with [pcolor = green]* x8 D9 g1 a0 o' H5 Z# C1 ~. b
end
5 z! F( e7 k; C3 a可是运行时提示no such plot: "Totals"
8 Y: o5 W/ i3 z: werror while observer running SET-CURRENT-PLOT
0 q. @$ t/ I. [ A5 S called by procedure DO-PLOTS
+ M Z0 o9 w+ R called by procedure SETUP
% v- x) h( z# `: E! E g called by 按钮 'setup'
& p1 e6 U1 p: w: y& X6 K求大神解答啊 |