我编的程序如下turtles-own [energy]
8 k0 v( G% c5 {* @to setup
4 p8 w" A3 S, V- v% Z clear-all3 T I. g- a$ D2 H' F
setup-patches
j7 r: E3 s D6 V- i3 K create-turtles 100
8 x3 d% s6 K( W do-plots
3 C5 S: e- W" B3 w7 Q1 P A9 v q ask turtles [ setxy random-xcor random-ycor ]( k. z d' n' v: N$ T7 M
end; ]; j5 i# F4 H% M' A3 r
to go
4 @* ?! D# P9 m- _0 i8 K1 L move-turtles
: c' a/ n' q& m eat-grass3 L- Y' a) ?5 G0 y
reproduce
1 [, Y$ Y8 ]$ B @& X1 }/ Y# y# F check-death! \. i1 I2 O' d! J! [
regrow-grass/ p8 ~: O7 E1 q# J D3 t
do-plots
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to move-turtles
) K+ U, v5 P; o1 I- x3 \/ i ask turtles [
6 `2 V4 Z/ U( k5 g right random 3608 ]% t$ T2 {& Q/ l y- q* y
forward 1
: u! {3 }1 c1 I4 {% J set energy energy - 1
. D. K( K, ~& x! B/ y+ k1 ^" a! z ]/ n+ X3 W8 t! O
end
+ i" A+ b' Y" Y4 _# dto setup-patches
5 g6 [& Y( Z1 V ask patches [ set pcolor green ]
; e( a( W2 T8 ~1 J. B# P* fend
: [, B, L9 p S( m7 F8 lto setup-turtles
( L& u& A) j$ S, }/ g. V0 V create-turtles 100( n. e9 ~* _# S/ c( ^
ask turtles [ setxy random-xcor random-ycor ]
1 O8 I' Q' W- ~! X2 e8 dend
5 |. R7 Q7 o# l+ gto eat-grass
/ B- v x' }2 e+ b: y# ?- a+ V ask turtles [
0 g( p0 f: n! b% D if pcolor = green [
: v* i3 H2 G, r) |8 k set pcolor black7 I- S/ H/ ]; F! o+ `; y/ o: O- V
set energy (energy + 10)1 ]/ i8 @% C; a4 }( b: ?* [
]
0 D2 d) o, f; R3 t8 ]' ~# y0 y ifelse show-energy?
' J& |! G1 K0 S5 _) v0 T [ set label energy ] ^# L5 q& z; \/ [$ J+ @- I
[ set label "" ]
! ?& @, y; E4 ], p$ z3 r ]7 N- q+ o+ f7 q# Q
end$ _" \, J& C0 S% W7 ]6 d. c
to reproduce" I& \* s; U! S/ p; e9 e
ask turtles [
" r! m; s% i- F2 _" j if energy > 50 [7 _5 Q5 Z; v6 i+ U0 ?
set energy energy - 50* e( o6 U' V3 }, [' h9 r
hatch 1 [ set energy 50 ]
$ b; Q* e! g+ `# [( t7 o) h# z ]
3 I4 Z/ G; y' ] ]7 C; j# L) |3 } T8 ?
end
6 Z1 d1 T$ s b' r: D0 p: lto check-death
* r9 @ @- @9 z) L3 O- T ask turtles [9 [- Z+ c ]) L; B' P2 O. J
if energy <= 0 [ die ]) g/ [& i, H6 N( R
]
t) I/ \5 y1 F+ f1 u* Dend: K# i9 ?# a4 c/ \9 r
to regrow-grass
: M5 a# |6 @( G+ g" f ask patches [2 d2 B9 f% t! d% H
if random 100 < 3 [ set pcolor green ]
6 i3 U$ h% {" z ]5 P1 ~. b- H4 l ]
: C: e A( W+ T3 u2 E% ~& {5 ?end6 O% H/ X4 G% J. K
to do-plots c5 a' K) H0 @' V
set-current-plot "Totals"
: K: ]" m: c: c( `* D; x9 V set-current-plot-pen "turtles"
9 M5 f3 h9 {3 E" p3 D8 g; i9 f plot count turtles3 b3 [6 ?* M/ O$ i1 o
set-current-plot-pen "grass"
" r; C- K: ~. \ ]. D( \ plot count patches with [pcolor = green]& R. x% V5 O( ~! _! m& ?
end0 C3 M; k) [" C3 w
可是运行时提示no such plot: "Totals"
' ]( H/ U* b7 h4 Berror while observer running SET-CURRENT-PLOT
! e" S* B( g; {! p1 ^ called by procedure DO-PLOTS
; A. y' w% [+ D called by procedure SETUP, P4 {$ p4 y" o
called by 按钮 'setup'0 z; e) }; K( K6 ]1 h& }
求大神解答啊 |