我编的程序如下turtles-own [energy]
' c% }6 j: V0 a. kto setup
' P# B3 A8 [" m1 H clear-all' A1 R! _ j: j- B" p( R8 ]5 o, O
setup-patches9 v. K- m; B4 p
create-turtles 100& F/ f3 w7 L$ j0 @1 n [
do-plots
' K* \0 Q, x- P ask turtles [ setxy random-xcor random-ycor ]
: X3 f* B+ `0 ~+ g2 H$ w v0 f! Vend
! k# y \ X+ Q& j$ C# D; Jto go
& G L9 Y; z- U; b1 ? move-turtles3 ~5 O/ I/ g$ Z! T7 b
eat-grass/ q& Y; z% y9 Y
reproduce
6 Z/ s* B4 m# B1 u" s! s8 ` check-death
3 |% d: S2 b- ~" @" v+ Y regrow-grass
- ]- o/ e' S! x+ }# v do-plots4 ^+ m9 S* k2 P: A3 ?9 Q4 I
end
. v% Z) R) Q0 h/ gto move-turtles/ Z" s% ~* L7 j$ |- U
ask turtles [7 G1 [1 e. n4 p+ r3 M7 [7 u/ s4 h4 c$ Q
right random 360: P) S8 X6 x: b* a) @: t: _$ l% m
forward 1- j) z. b ^1 M3 V3 T; G9 t! ]. l
set energy energy - 1
$ ]- a( z% R9 m3 h4 h$ O ] G. j! L4 H6 P7 |- W( Q: J( X" V
end) m8 K/ y/ u/ z9 b; M
to setup-patches. u/ l. z5 w# B( C6 G W) Z7 X3 }
ask patches [ set pcolor green ]
6 p% H4 d- i$ Z" s2 N2 [end
* ?* Y. q- K$ tto setup-turtles4 a- w e; M5 v$ [7 m0 q& E
create-turtles 100- v+ c8 u: `' }- a
ask turtles [ setxy random-xcor random-ycor ]/ i3 m2 b: D! F# C9 q
end3 a; p" T+ u' j. |3 _
to eat-grass
( z% }& p6 G0 { ask turtles [2 D0 H% ?1 m1 t% g. [$ N8 g: g+ @
if pcolor = green [
. F$ x; Z2 {" r V6 e set pcolor black! g! r8 d* h& ]
set energy (energy + 10)
- b3 Y7 U% p% I! ^' T+ O: ]3 v ]8 o3 u2 C( b" D3 H
ifelse show-energy?* D$ ~$ U i# g7 C/ S' I: }
[ set label energy ]$ e( X. y# R' @2 d" N: Q
[ set label "" ]# ?7 m6 `0 N% V
]
' X, W) v7 ~3 ?+ X/ |9 uend6 O( x0 d/ Z2 ]/ O" T& Z
to reproduce
+ _) K" X# @9 |. X9 N3 o ask turtles [
, w* K$ t2 ^- K+ J if energy > 50 [
% z! C* d y# r& w& x set energy energy - 50+ g$ ^" g, M+ T" W$ V$ H) b
hatch 1 [ set energy 50 ]- N) S# g+ b' ?4 R1 {) ?1 j" e
]; Y9 g9 ?; o d+ K
]
8 x3 f: u% c9 e$ d- Q" S2 [) \end
1 |( d) V4 F! J- n& A! Y6 Dto check-death4 o- y& X/ S; l) h, Q" u
ask turtles [7 R, U/ ]: y2 m% y( [& a% Y0 ^
if energy <= 0 [ die ]
) r4 {6 e# ? \ h+ g6 x) l8 s: T ]4 B- G7 d" _& ?4 `
end
2 y" O# |$ a7 V& }& h/ e9 }to regrow-grass% S* r) n3 r6 I0 H$ g
ask patches [
' R5 e0 z; c6 g, F1 C0 v* k# F& z if random 100 < 3 [ set pcolor green ]
0 E) A# p6 D+ X4 `! p* G ]1 \) V3 @/ ?3 A6 d6 }% }
end
& j4 r4 q6 h4 B6 ~* j$ Bto do-plots
0 u3 n% L+ P$ G) }: p7 `+ | set-current-plot "Totals"% b6 f; H0 T6 {
set-current-plot-pen "turtles"
- b+ H6 l6 F! o' `0 ~( [; ? plot count turtles# Y! `3 p2 z' v, C6 p) `
set-current-plot-pen "grass"
8 G7 [+ H9 i2 Y5 ~ plot count patches with [pcolor = green]
& O/ t2 ?' z2 P: |1 Y iend
1 Y! y$ k `2 u8 P. A5 l% x可是运行时提示no such plot: "Totals"$ S, g+ L" \# x
error while observer running SET-CURRENT-PLOT- `) v7 S) X7 C# u, [
called by procedure DO-PLOTS
3 c; g# W* |: {3 O# k3 v- K called by procedure SETUP: Z- u4 g% Q3 z2 O8 z
called by 按钮 'setup'5 h, ]5 Q( M: m- r* G
求大神解答啊 |
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楼主
发表于 2013-5-29 00:25:38
