我编的程序如下turtles-own [energy]- ]7 g( }0 z" ?# z" j
to setup* l: s" t& ]* f6 S* h0 s7 b$ f# s8 g
clear-all
' w* `. i# O0 r2 V3 d7 p8 ` setup-patches+ i2 h+ {5 _9 c; x( D6 e
create-turtles 100
* g! @/ J$ k/ H2 ]( l do-plots
+ l5 N* O3 t- i6 y$ L# X. s2 [' G ask turtles [ setxy random-xcor random-ycor ], p$ l& L8 |5 g6 \
end& y1 u( B5 }, w0 @1 e5 m3 Z1 O
to go, _; G7 `# o/ F3 Y% E3 S6 {$ Z
move-turtles
% I @$ w: d( I t2 G1 ^ eat-grass2 G$ \! y6 p- Z9 }
reproduce( v' f1 Y; M( q
check-death
8 B+ R' D! `; U" q" O regrow-grass1 }5 K) A; s9 _3 R( [& g
do-plots
6 |) N, S/ ]: d' g3 Kend
O* B3 U( c. @, sto move-turtles r! I& U1 N; R B
ask turtles [
- q7 I! a" s% U6 }- ] right random 360
( N( h N0 Z# m) L1 G forward 1) m+ q! L$ P3 W9 L/ c, k) \) X
set energy energy - 19 M; e7 k$ |/ w& e
]
7 v5 m7 I! Y r* Q0 Q! {% n1 }; cend! Y; n( M k/ h7 Q, c/ K' a
to setup-patches/ L, j5 |2 @ D( P. @
ask patches [ set pcolor green ]. V4 L1 |& D" {6 J+ p- |; Z
end+ U: c$ V; n7 ^( _0 t0 M* J
to setup-turtles* Z O# v5 s9 o# @+ w3 G
create-turtles 100
4 @! i6 ]0 O: j' E ask turtles [ setxy random-xcor random-ycor ]2 x% F1 @0 u L/ M" q
end% O, W: X. ?8 X+ K
to eat-grass
' g; j- b* r: [4 q- \' ^; p/ T ask turtles [0 k; V% Z* J, B% _
if pcolor = green [
+ Z. C# F' I7 s, E4 m" I; V+ \0 a set pcolor black, M; J5 I9 M D8 S
set energy (energy + 10)0 Y+ W2 [2 _' Y6 H, O2 w
]
- f* O# |# c% Y8 g2 e% p, p ifelse show-energy?
* y. }5 o; p1 e4 g# o' p7 P3 v8 V [ set label energy ]
. A: j( T! p8 {4 M; B [ set label "" ]3 Q5 T `( u1 v7 T5 Z
]
9 K U3 H0 O$ e! m2 i' jend6 V3 q2 d, V% j+ k8 {3 ?
to reproduce; o* n2 x( J. t: f' y. L! Q
ask turtles [
! l4 B$ m/ b+ B8 d& } if energy > 50 [- a" l; v; B" v# }; J- y4 v
set energy energy - 50, h: c1 c |1 f/ ^
hatch 1 [ set energy 50 ]
6 j& ^: X7 a8 i$ H& [: h( q ]" C9 S/ [$ u# h2 W4 c- t
]1 ^1 E& k- K. V1 t$ L( a
end
/ t, ^- g$ h5 L: z' eto check-death
$ \+ k8 v! `; T, ^" H ask turtles [
2 \$ t' O- d3 P if energy <= 0 [ die ]4 L* E ]( \/ n4 i$ N3 R2 A
]
( `; c0 n/ w' u* e. jend# B) Q) y+ r9 l3 i; ?7 L3 m2 C
to regrow-grass% D* ~) `& s- ^
ask patches [
: a5 S$ v& @# a( f* s! o" X if random 100 < 3 [ set pcolor green ]7 C" {* i2 n6 d" x
]
# S2 w- L0 z! C% W& w4 `end
6 G; i) e6 L2 l9 c% c1 v- L/ i: rto do-plots$ z: K; S& R5 V1 V* w/ P( m4 Y
set-current-plot "Totals"
7 I! u) H& b# [; o' q! a set-current-plot-pen "turtles"6 U# O8 x8 }6 l
plot count turtles
+ @( M, M1 K5 @$ l9 X set-current-plot-pen "grass"& c+ Q; w$ M6 F* ~' E& _- a H
plot count patches with [pcolor = green]
3 O3 \7 i- ?6 ^1 f; Z0 w, R/ f; Uend
% r& }& I* T% C/ \- M& W% O$ K可是运行时提示no such plot: "Totals"4 c) t* q2 {2 ?# m$ X
error while observer running SET-CURRENT-PLOT
: U/ h% l# C9 i# f1 R N1 Q6 { called by procedure DO-PLOTS
1 O2 m( S; @; G4 G7 B0 S+ K called by procedure SETUP
) s7 D; w( P o) Q! Z* ^ called by 按钮 'setup'
$ v6 z6 K5 C) A# Q2 {! z求大神解答啊 |