我编的程序如下turtles-own [energy]' d4 F) ^& W Q! S* r* J7 j
to setup
, y: W9 F3 K7 H* _, q* d clear-all
1 o% U* ~0 O. p" ?2 m setup-patches- ]* E" a1 L, p! K
create-turtles 100
( X8 K: X7 K4 }/ ^( x* C5 N do-plots
& k# Q0 y" }! C4 j1 K/ X+ O' J- \ ask turtles [ setxy random-xcor random-ycor ]
% s* y% Q# J) m' x0 `4 B, p' Tend" h( A' d" i9 g' G
to go
3 T) h/ x" ~( R5 r! [3 Q move-turtles
) {/ u! _: K9 u! Q eat-grass, e0 B! _9 m. B4 T% {3 r. E4 C
reproduce' {+ U% R$ a6 O/ m- X
check-death
: b; a, l4 X, W% g$ K regrow-grass p8 S( c. H/ d w6 x3 X, y9 Y
do-plots
' {* v2 N9 A! A T% [end' h/ p6 U3 @" O! C9 `
to move-turtles; z: J% V+ q+ ]& y4 x
ask turtles [
# |1 y1 T- b0 p. o right random 360
3 I9 V8 f3 T! ]. C( [. Q# c forward 1
4 o' {$ j0 O1 S3 o set energy energy - 13 A0 @. G3 V& P* V5 R9 Y# E; @. K
]
( G- Q! K. m2 p# B4 n# M y, ]+ Bend
& {5 H: K0 b( ~ Pto setup-patches. L# q% J3 ^4 T# b; J9 H) L
ask patches [ set pcolor green ]4 t# X2 T9 ^7 M! T, d
end
+ i4 o- m8 |. V- Nto setup-turtles: J c6 h" |& ~7 p8 S9 S- d( c
create-turtles 100% O9 }/ f1 m( D
ask turtles [ setxy random-xcor random-ycor ]
t* r* u, h; r6 |4 X8 G1 Wend8 U/ A5 |4 N# G
to eat-grass) ?' M/ ?7 j6 O y" }
ask turtles [" Y' t" ?9 S' J2 x% ^
if pcolor = green [
. U1 M* h5 M& ^+ l set pcolor black
3 U A& x+ X6 X8 f) z2 b1 [ set energy (energy + 10)7 o) G: x$ c6 G7 E Z H0 Y
]
: o, T0 y1 L7 l6 z ifelse show-energy?) K+ Z0 ~( Z5 U0 _ V- s/ E2 F" c
[ set label energy ]
2 Y3 f, A; l3 X4 N3 d" W3 A/ F& c [ set label "" ]9 M1 D; O( f# j. ?1 E
] S4 D$ H# I; B2 z- ]3 n" x1 y
end* n& G/ E5 `" S+ C6 ^' W
to reproduce
4 c7 L* m4 e- \7 x3 u* j ask turtles [
/ x4 T% U# Z+ w5 P% \5 S; z7 g if energy > 50 [9 p, y( E, u1 a0 S) f
set energy energy - 50* h2 T) w2 |0 B& N
hatch 1 [ set energy 50 ]
+ }5 v5 q+ z* Y! L' K0 p! H) q ]
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end# Q2 p" x- ?4 q2 J- b& t
to check-death. a! ?7 ~& {7 F2 Q7 F: ?9 _7 ~$ M
ask turtles [
9 V: N3 a& q" F if energy <= 0 [ die ]
$ n0 S' {2 M. P1 z2 J- F ]
4 h9 x4 J0 I n4 pend9 L( u* M6 v. ]! ^1 g2 j, `
to regrow-grass8 P: o3 P0 `2 q
ask patches [
! J2 \+ `4 b) H8 S9 v! _2 f0 e3 j( `/ c) S if random 100 < 3 [ set pcolor green ]
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end
+ h, s7 H1 L( [+ Eto do-plots
: W8 g9 n( ?4 O" ` set-current-plot "Totals"+ w# N6 D/ t0 H( j9 x9 ~. L; H8 Q
set-current-plot-pen "turtles") ?" _* g3 Y; v
plot count turtles
$ Q( l4 ?4 B8 o' p0 [ set-current-plot-pen "grass"
1 ?. X. A) [4 X( t5 S/ Z9 T plot count patches with [pcolor = green]
; m8 t9 Y4 m1 A% v3 [end
9 \/ m- E) u/ Z6 p: W& o0 ]% Z可是运行时提示no such plot: "Totals"
0 G' s- R% R# r5 b& ^ \error while observer running SET-CURRENT-PLOT
& m0 d, R L4 f7 l$ e called by procedure DO-PLOTS: |2 f/ b( h2 d) A: F2 [) `; r
called by procedure SETUP& B7 n- ?; q! V( w( S
called by 按钮 'setup'+ l0 p4 b6 F2 T0 n! y& M
求大神解答啊 |