我编的程序如下turtles-own [energy]( \9 \- M! p' r4 _: B8 {* S
to setup
5 d E: h( _6 s1 O1 D" p clear-all
0 f$ I+ N/ I: q7 a+ g setup-patches
- P( Q6 u6 Z* V( r6 @$ V0 t create-turtles 100
w" T. M6 }: c& Y2 O9 e5 D* Y% m do-plots
: J& z" l2 ^- s& D" N% o ask turtles [ setxy random-xcor random-ycor ]
4 }. b; G9 D0 `" B- P% Oend* f, j% i* E/ i, c
to go. Z5 U$ `, Z( I1 R, k/ R
move-turtles1 p/ w+ I8 Y4 r* g" Q f
eat-grass
- @+ @5 _% [( t$ y5 g reproduce+ F+ F" V, R) K& s# m5 u
check-death6 G; O& ~0 o+ t4 r( o
regrow-grass
$ Q h s! J5 |1 V5 @6 }' X do-plots
/ x) E+ P% \% ]8 r8 yend# M- c) Y6 j" i1 c; [2 o, j
to move-turtles8 d$ j+ ^- d0 A' k% o
ask turtles [
% L5 x( ^3 I r+ _4 x right random 360
. U. H' t" Y$ j) l+ Z# ` forward 1( m" O8 g6 n& z# z
set energy energy - 1" b5 P; R# v9 F& z9 K. v
]5 X0 A0 C8 a) x% p+ P
end
' ~7 h ?- @% `to setup-patches
$ B. ]1 d9 T+ [! g+ _- Q/ t" e ask patches [ set pcolor green ]7 U6 i. [; Q% w
end) h/ h; y3 d( e! @
to setup-turtles
" _+ N( a0 F( T0 i. \ create-turtles 100$ `. }8 j7 M( R& s
ask turtles [ setxy random-xcor random-ycor ]5 ~- z/ A* Z4 B9 L/ F0 ~! Y
end
& |% g; z5 I1 z4 G& D uto eat-grass
+ V9 C$ c; \, p2 T. U ask turtles [
2 x* t0 L; F! t8 e6 ]4 u' N if pcolor = green [
# m/ v( L6 T, l' f( d( m' X7 M) @$ H set pcolor black
) G! M1 x" U' j: j2 I, \: L set energy (energy + 10)
2 O+ o! u! i( e) M5 A a- W9 r ]4 u6 {$ y1 K! u ~5 F3 L& `1 k, y
ifelse show-energy?
8 [ @& i8 J7 w: x% a$ V [ set label energy ]
) ~4 q" J# Y# W! A7 O+ {( g; K6 g [ set label "" ]5 L+ i8 z0 U; ]# X
] y$ S" z" t$ Q3 K
end
" [, l" Z1 e1 x7 f3 A Oto reproduce
; v9 ~. v2 y8 J* F4 L& o ask turtles [
5 g7 @1 I. O7 A: A2 J4 @& o if energy > 50 [
" ]0 T2 b& |# `2 w$ O9 B) ~/ _ set energy energy - 50
+ E! q6 E: y/ B1 J3 Q$ F hatch 1 [ set energy 50 ]5 N9 N! f/ r2 m
]( V* @7 B! D, c, W2 r C
]
: C. H* C2 \ Wend) z7 B0 E$ n) B8 F% _4 B9 l$ r' c
to check-death5 x( z, Q5 [" m/ k1 J/ }4 i
ask turtles [
# \: w4 g2 b4 v, I/ j if energy <= 0 [ die ]
% [) |$ @: U. f ]
2 E; U- t- e' I/ s9 `( s7 A) _end
/ ~' q0 R# |, m# t9 `( Oto regrow-grass f% o5 j" u1 t0 y4 P# D0 y
ask patches [
3 k; n R$ o8 l0 F* \0 J if random 100 < 3 [ set pcolor green ]' R' _; o. j, u& \
]
4 e( c- Q7 [& d) b/ R$ B6 [! q# Cend
# b, A4 o# }# A7 v6 ?7 o# H4 yto do-plots
; k p3 x; _; g3 i set-current-plot "Totals"2 G) h3 C- T# B( p6 [( k
set-current-plot-pen "turtles"
# U" S& U7 p8 M- h plot count turtles4 }) n3 x Q3 W
set-current-plot-pen "grass"' T, V% D$ D5 `2 L# x$ f& l6 \
plot count patches with [pcolor = green]8 ]7 @6 @0 W* D) X9 C
end6 J! I& J; @" N9 h
可是运行时提示no such plot: "Totals"
: S' C- e, }5 |( Zerror while observer running SET-CURRENT-PLOT
4 ]+ D& m) Z2 P' F% {. S called by procedure DO-PLOTS6 N6 W, w* h7 a1 t7 @& B
called by procedure SETUP
( h, [5 _/ H" K* \$ v called by 按钮 'setup': C& c, G; R8 L) t' i4 k. q, ?/ G
求大神解答啊 |