我编的程序如下turtles-own [energy]
. ` P8 i0 d* D4 ~ S& ato setup! P) \: C& i: Q7 L0 h2 j$ M
clear-all0 t& A- r k8 A/ \) Y& n1 l4 `
setup-patches
) N! }( S7 ^7 }; o create-turtles 100; d# j& G3 @1 d; M9 I
do-plots) k* L, B$ e0 \2 Q7 u( z) f+ q( _
ask turtles [ setxy random-xcor random-ycor ]
- Y: O9 b1 K2 }end1 n+ Z; s. A3 L1 U" i. t( Y
to go
/ d! D' B' W; @* n S- ? move-turtles; ^% i$ t5 K" v; k
eat-grass
9 G: ?7 S4 {4 r reproduce
1 ]$ t( ?8 s1 `' ? check-death' h$ _$ L& T; S4 L8 R: o+ e+ Y/ q
regrow-grass
+ Z) ~' {& }, S) W% t" ~' s do-plots
0 R/ \ D0 @# p) ^; y, h& R( Fend
( \4 o: I* ]1 ?) U+ _: x _% Y& k, tto move-turtles
3 T2 e) k; \9 w: ] ask turtles [
& R7 j; W) e( M5 o! O& f right random 360" B( m8 j" k8 L; h5 |' P) H6 q" Y: w
forward 1
/ ]* A8 t9 d! q7 M+ _1 }7 B set energy energy - 1/ \, ^+ D* t+ e+ w, S
]
7 b1 z$ g3 C- R( cend; a" s' L: D6 \1 K& |4 u
to setup-patches
+ {' V6 v9 }1 G5 z m2 p' _' P ask patches [ set pcolor green ]% k& |' a7 X# m* S
end
2 H1 R1 [- M! @- n P' a tto setup-turtles. S0 ?2 B2 G# }6 _4 x o# D4 Y( C
create-turtles 100, M$ M& A" s# b+ U) w
ask turtles [ setxy random-xcor random-ycor ]; j3 {# b" _# y) j) Z! J5 W" E$ [% S
end
% x& ?( `: d( n2 A# K8 Cto eat-grass, \5 S' j, |" j8 y
ask turtles [
! @/ r" z3 ^+ ^ if pcolor = green [
' y8 G; x9 K8 E7 p1 a6 Q set pcolor black
0 w' S6 N: i* ]3 I set energy (energy + 10)
* K, o5 }7 f/ j' ?+ k ]
8 g7 t/ p; v( ~+ g* i$ ^. a" H. v ifelse show-energy?
3 X% b+ f. c* Z r, W8 Q( J [ set label energy ]7 o0 {' E* t ~2 V: y: \. |7 Q
[ set label "" ]. Y9 d# h- R6 Y4 q9 V
]
8 }1 T! ^4 |/ O4 d% _8 jend
) Y! [) }9 D% V! I( B2 K3 vto reproduce
Y8 ~' p# ]! C I3 w ask turtles [9 y- ]; z, j6 q/ _& J `' f
if energy > 50 [2 k# z% t @* u) O! ]3 |
set energy energy - 50# i* ?! i+ ~" X5 h' ?: ]
hatch 1 [ set energy 50 ]: g# a4 E# I# s# ~8 q, z a; f
]
& ]9 r1 m/ u- F! x ]. m8 F" L1 h" I, v. j
end* ~6 f* A0 V" U) q- N, W- r& Y
to check-death
1 c, o6 a+ ]# t! M) a5 h ask turtles [
; U0 q, K* D/ Z" ?0 t: l+ l4 S6 @ r if energy <= 0 [ die ]
) s5 x! r$ y6 P% p ]6 `6 B& h5 @7 j0 C1 i. Y
end3 {/ t2 j4 d: b. u0 S
to regrow-grass3 A, L+ i4 \ ]
ask patches [0 h- ~2 ^9 I2 @( R: S
if random 100 < 3 [ set pcolor green ]9 T3 i. u( R1 X4 o: R
]) I4 _5 r1 g- K0 G0 B; k
end( I0 v8 q; ?% Y/ q+ Y
to do-plots
' R- o# K1 \8 Z set-current-plot "Totals"/ J5 J6 ~ G/ j) b
set-current-plot-pen "turtles"
' g6 i8 J1 o0 m" |, W' P plot count turtles7 G9 N; b& S" N2 q% e* k! A$ ~3 T' G) E
set-current-plot-pen "grass"& j. E9 U. v+ L, j1 Y
plot count patches with [pcolor = green]
4 U: p N, x. D' h% V8 Rend
5 |7 |0 b& ]; r1 F可是运行时提示no such plot: "Totals"
4 J; ]3 c1 t3 {( K; kerror while observer running SET-CURRENT-PLOT, z3 @: I+ [# R5 w+ G
called by procedure DO-PLOTS
1 [& r; V4 `# x+ n4 Q$ } called by procedure SETUP
4 C* k; [( o& | called by 按钮 'setup'* w9 g' N+ A. t* Y2 d6 t
求大神解答啊 |