我编的程序如下turtles-own [energy]1 c4 r# g! H7 z8 v
to setup
1 |! h1 Y+ k0 `$ K1 C& v clear-all" C5 o) f" I! l; L
setup-patches2 S9 @# k u, {2 z: M
create-turtles 100
_8 T5 b8 ?0 d6 n9 f5 S9 K do-plots8 [7 h, D( b2 v
ask turtles [ setxy random-xcor random-ycor ]% c5 W- r) V2 U& X/ R/ z
end8 s( {' }' V1 D7 |* H0 K
to go0 U2 z; t" @/ U' u' V- O
move-turtles Y/ C+ M" H! o. r( |
eat-grass( ~9 d' s3 C# ?0 C; P
reproduce4 y; Q% s1 s v, c( S1 L
check-death8 E# c1 U" M* }7 P+ I# {
regrow-grass: m: Y6 Q+ ^/ L
do-plots# F- H- O' r; J1 x3 N) K, A( U
end
/ r+ d: m! q# X8 }& Hto move-turtles9 Q! B7 H: d2 @# ]& a
ask turtles [% h7 f; ^# T" D3 O9 v
right random 360
7 B/ b4 G2 A+ B, o1 {: V forward 1
4 U; e7 v: `$ |( Y8 l3 W- G set energy energy - 1
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end0 r6 i( W7 P- S/ u1 a2 O) s; w
to setup-patches$ c- e! I2 H: P$ E
ask patches [ set pcolor green ]
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a" ?- t1 G8 H5 fto setup-turtles* g4 m* ]- s+ a# l
create-turtles 1008 E- q& }# q: A) D3 V( F
ask turtles [ setxy random-xcor random-ycor ]
. ]9 q9 F) r @5 E. Oend- P, _7 T6 q8 C; [# @8 f+ s
to eat-grass% d# c3 b% G0 M U" X6 K
ask turtles [6 c. @0 `2 A( R# [7 j) f
if pcolor = green [
& K% }7 Z2 G: N% K$ ?% ?6 K' D U1 p set pcolor black1 k) ^% M, y' e
set energy (energy + 10)) a# L+ h2 z' X3 ~0 |/ t
]/ ?! B# j& s- k2 M( l. Z& q
ifelse show-energy?
t5 j6 C- `# O8 G3 z+ d5 D [ set label energy ]
' X; Q8 u0 B/ ^8 |3 L+ c/ ?+ o% p [ set label "" ]: x$ X+ `' Z" O" |9 Q) i
]
* [! A- _4 g- u! L. B0 V( b0 W2 jend
0 |" c4 S) @, P: m% d& i! z- W6 L( _to reproduce9 s k4 e" L8 X
ask turtles [
P/ r# h2 i7 f$ @ if energy > 50 [0 s9 _" u) h# X/ b1 f% ?
set energy energy - 50% f# T4 d5 S+ H1 L* G6 |
hatch 1 [ set energy 50 ]* E2 c/ F' e, ^: q
]
- @6 u5 H6 O$ r* ^: r* n6 |7 P ]
1 |8 H0 g9 l! u) F$ K- v0 \1 `) T2 eend
( R) |* S/ t6 E1 v" j) R7 J5 dto check-death
@3 M z* w: h ask turtles [" H* Z" P( N8 r% Y) G5 D4 `8 F
if energy <= 0 [ die ]
. N2 S* K. K5 p ]
( H7 N0 n9 |3 `; M1 W. k/ ^- qend4 o- q i- E$ V `6 p5 i4 P3 I0 I
to regrow-grass
, s; {! N) {3 [3 v5 U4 c ask patches [
* z9 [$ v4 r3 p& y( }1 S' E if random 100 < 3 [ set pcolor green ], |+ U$ ^; p3 m/ N* B/ [, v/ L
]- C' c6 F2 p1 p
end
, e: p8 B0 a1 M' d- qto do-plots& [$ B, O' s* R" M- V
set-current-plot "Totals"
9 b' R; q7 R. }- P6 [3 ~4 x* V) U" j set-current-plot-pen "turtles"/ E. Y5 D- V* N8 C3 E
plot count turtles
& @ x/ P' B3 `: I, x( N set-current-plot-pen "grass") \8 G) h" l9 n) U: `
plot count patches with [pcolor = green]
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可是运行时提示no such plot: "Totals"
, A0 y! m( d H: d$ ]9 kerror while observer running SET-CURRENT-PLOT0 L: g$ e& S6 J+ X4 l" O! ~# ^4 Q
called by procedure DO-PLOTS
$ u6 Y3 ^" k* B+ H called by procedure SETUP! Y" \$ o$ A# H4 l- S; t
called by 按钮 'setup'
( ]4 _% c; R" e- {求大神解答啊 |