我编的程序如下turtles-own [energy]
9 ?0 V- Y$ M) U) ]to setup
* \6 ?0 o. [" j4 T7 L+ I9 _ clear-all" a3 E% N6 i9 b1 n/ g
setup-patches
. M. l2 m M% C+ E7 ~( @2 Y create-turtles 1001 S2 f7 @; Q9 \- [6 C, L7 l
do-plots9 U# u' @* O$ C5 k: L
ask turtles [ setxy random-xcor random-ycor ]" S _5 o$ @ O2 ?# S/ L# }# |
end
' n! \" B- l( n. D& p1 r. Qto go
, p; }; _) H( ^/ j3 D- t move-turtles
0 A* {2 O* N5 [! l eat-grass
4 }0 j. |- o* {2 l8 u, G- {3 Q1 S0 ~ reproduce. P) g' U$ @$ f5 q/ I% S
check-death
- o# p! y# t( s/ e/ G# C regrow-grass2 |* K6 t; y# q- }4 ^
do-plots! a0 [% d! X3 H& e0 T
end* o% b2 i; w. N1 n3 }4 ~/ g. d1 }/ X
to move-turtles3 Z7 k6 E& ^, g4 v9 G! z* `$ c0 T
ask turtles [
; N0 ^# |/ x$ y) Z S; Q( e& g right random 360( l! b7 r& o$ O6 S8 [3 C/ h
forward 1& i0 d" G8 E7 \! T" m
set energy energy - 1
" l' Z5 W0 G7 ]/ s ]
' l- S n" C( O' I5 Q: nend
- z" L% s o) Q# @$ P' Qto setup-patches: \9 J2 q. @' S
ask patches [ set pcolor green ]
+ C/ i. O$ k/ S9 b2 rend
+ W+ N( a& s$ _: | H0 O2 eto setup-turtles2 [( c8 e" ] ^
create-turtles 100
8 m8 l2 O) t, g+ c7 p8 w& K ask turtles [ setxy random-xcor random-ycor ]
6 a9 @/ f( ?0 C2 n7 | Z) hend
/ P0 t# ?; c' S6 V& D+ uto eat-grass _0 N1 T3 c% ?; V: `4 @( P* A
ask turtles [
# P( I$ ^3 u; I% d; W if pcolor = green [
/ }; a$ B2 P+ ^4 V set pcolor black/ l2 O7 p5 ?6 }# {5 b
set energy (energy + 10)$ o# z/ i' ]9 U& G/ W+ Z& M. o
]
, i" A6 R2 z% t0 I4 ~9 z ifelse show-energy?2 r' k" D& v/ i# `' B2 n1 Z
[ set label energy ]0 \" C a/ b* N
[ set label "" ]# l8 E; n x+ V- s
]
5 T: ]9 b. c2 ^% ^end& p& {4 M* {; _
to reproduce
$ y, J) s; r/ k- \# p4 f ask turtles [8 c' k' a7 J" @: l: p0 Q. U
if energy > 50 [ R* x; d0 k) G- Z+ |# L
set energy energy - 50+ |1 M. J. |3 e4 D9 v
hatch 1 [ set energy 50 ]
" C( d+ @: p. U& S8 q ]
& J+ v5 z I1 V6 C8 ~7 o d& _ ]) \+ n T; v- j% N1 s) ]
end5 g j+ ]# _5 N
to check-death# ]2 N0 |9 F9 v% ^5 R
ask turtles [
) o6 u7 j1 k2 U M8 y3 q+ J$ h if energy <= 0 [ die ]1 v; p: p+ b8 D) f0 D& |# j
]
& y% C; u/ w8 Cend
! a9 k0 V% o1 C8 G4 w: i* U2 u3 l v& `to regrow-grass
. q8 c N! ?/ }9 G* \8 j8 w ask patches [0 F$ h1 H4 ~) c) P6 u9 I
if random 100 < 3 [ set pcolor green ]
H& Q/ G V$ F5 c, w0 u ]
2 E* q+ e& E/ ] ^* D2 Gend3 J! ~1 a9 B# i2 O" I* f
to do-plots2 y& J1 K% k9 r' R. ?5 k
set-current-plot "Totals"1 v6 {6 P( i/ n0 O" g3 u# m2 B
set-current-plot-pen "turtles"
/ A; ~( o, ^8 C8 ]$ O; b plot count turtles. O3 p* }4 q# p% a
set-current-plot-pen "grass"
/ F" @" ~. F3 k' N* r* n plot count patches with [pcolor = green]+ u/ `8 S" P# P- |) N
end
7 d' X) S# A) b( z+ P. U- u可是运行时提示no such plot: "Totals"
2 V) W' z" ^+ W3 S2 xerror while observer running SET-CURRENT-PLOT7 [" J+ g) y0 ~- U+ ]' k6 s, H5 C0 e
called by procedure DO-PLOTS9 t1 L4 X/ f* ?) R+ |& o! \% r9 K
called by procedure SETUP/ f7 C# @; r, K2 T1 z _) X% X5 U
called by 按钮 'setup'
9 a" i$ o4 V* N. v求大神解答啊 |