我编的程序如下turtles-own [energy]
& G& R: G1 a! Y! b3 {to setup0 D% ]& R) c3 B# e2 O9 v( S6 [
clear-all: c4 h$ T. i3 o
setup-patches
- f$ {- {4 r6 g( Y4 `# }& F! C" ]( ^ create-turtles 1007 X4 [: t# a) R( z! r' y
do-plots4 P- x" z3 Y: c% i+ {) T4 {
ask turtles [ setxy random-xcor random-ycor ]
6 L+ K6 J) \8 A' w( y: d/ V# v2 }7 ~end6 v }2 u+ ?2 S
to go
/ b. W" o! @9 B# a9 V move-turtles
# c6 i8 |$ N2 D3 Y5 j( y) d9 r" F) v eat-grass7 F7 M2 @% U/ F% f
reproduce
. ], f/ B6 v% j4 }. j2 V* {1 m check-death/ Y* O6 U: l9 u+ A, W {' ?, W
regrow-grass
6 {1 {0 R i& X do-plots
4 g8 B( `5 X! n3 u5 cend) M0 o% _. O4 o, h" \( v6 o( ^
to move-turtles. M" @4 }4 ]& i- `2 v/ \% M D
ask turtles [' r$ `8 ]2 P$ T
right random 360
0 B. j0 Z3 _3 [ forward 1
$ H4 q+ U/ v7 g& r/ J3 d set energy energy - 1
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end
5 S; }: u v8 a: t% ?+ m9 Kto setup-patches! f* |" t. ]9 B. D+ R3 Y. x
ask patches [ set pcolor green ]
: z: Z/ m$ l6 c' v5 j6 n6 Eend
) {, o$ I: N5 `" f/ mto setup-turtles
1 S' _0 ~/ A6 a2 }8 b" { create-turtles 100
y( l2 u* F6 @+ `. R( D ask turtles [ setxy random-xcor random-ycor ]* W4 t0 S' u* y2 ~$ K; y2 e9 U) g
end$ q' J) ?$ V" `
to eat-grass
+ g9 k! Z& n% V8 { ask turtles [! B T/ N4 ~$ E& H8 C6 V
if pcolor = green [
% e+ S5 [& y. J9 m set pcolor black
# U# _$ M/ W5 e6 z" O5 i set energy (energy + 10)
: `9 d: t4 m0 x" m! U; S2 h# f. U ]
0 a" T1 t! x2 O; i b ifelse show-energy?
! V& V) \/ j, B0 r [ set label energy ]
, J; X8 X+ R3 x6 X7 d; K2 U8 k; o [ set label "" ]
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end
- V! ?3 \% S1 {0 s4 D5 ]to reproduce
+ S" F5 l+ @6 A" d ask turtles [
2 w0 a; j# n# o( p2 p1 W if energy > 50 [1 T0 D+ X) G! F4 o- j1 q! U/ M
set energy energy - 504 m/ t: f v9 A$ x
hatch 1 [ set energy 50 ]
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]
# @+ d6 E1 I3 M9 R/ Vend
R8 U4 q. C/ Oto check-death
+ y3 u. k# _: k* W# z ask turtles [ f: m+ p# H& ~4 w( i& K B
if energy <= 0 [ die ]+ i: t ]0 r0 D" J. B6 B4 W
]. F1 G2 c5 l3 R9 c8 Z! G6 ]) d
end- o1 Z5 K( D+ B
to regrow-grass
; o) l) k) h" |& e+ X ask patches [9 H) [% Y+ U* m& }3 b, i
if random 100 < 3 [ set pcolor green ]
5 ^0 ]( O5 f7 @, u8 \; b ]
`( }; F$ D3 q/ D8 Pend L, [/ v. H5 C2 u
to do-plots
4 y% o, u5 o1 p+ x8 y- \. C+ A set-current-plot "Totals"/ R, t7 ?* {5 ~8 c
set-current-plot-pen "turtles"
+ n3 o4 E% ~% |$ s plot count turtles' T4 I7 e9 P* j3 x. _
set-current-plot-pen "grass"
' b: b" \1 I1 x( c plot count patches with [pcolor = green]# n& S$ p; r% Z* M8 g9 P1 D. G
end
6 p, `& ?1 f \5 R$ F& X9 W可是运行时提示no such plot: "Totals"6 e* u& k& u6 N9 l( }! ^& K
error while observer running SET-CURRENT-PLOT* e5 N8 [) S# r" b5 e2 D3 K$ V
called by procedure DO-PLOTS# f" J; g0 h9 _6 F/ k1 M
called by procedure SETUP5 }' t; V+ d' E: L4 J! a$ Y1 c2 V
called by 按钮 'setup'
- j* F) E/ a" P1 H5 {1 T) n求大神解答啊 |