我编的程序如下turtles-own [energy]9 C1 S$ q$ y# |1 E7 W7 q( [
to setup- ]: b1 p, @9 J
clear-all2 U I3 {/ @* i: f
setup-patches
( U' B& ~1 y" \# [: Q create-turtles 100
i. t' z% p8 ]: w" _ g9 T do-plots
. T9 c; K3 i% M0 b+ N( U- L( d ask turtles [ setxy random-xcor random-ycor ]
* N. H# x+ h& pend1 @& C8 \3 `; G# ` o( D0 R
to go
9 d$ ?0 B" `+ X! l move-turtles
, M% t2 w% i# C' [, w eat-grass
: J D% }* v; t! ? reproduce
& `! d4 ]! s% E; j4 y/ D check-death" a0 d+ S* C. a/ v5 k: ?
regrow-grass
# O& X% I# Q v do-plots3 Y3 c' a& d9 f
end
0 h- Q7 T) X- p: Mto move-turtles0 P2 U' S' j' [. Q$ q
ask turtles [& Z5 e7 y, f; C$ L* n/ A
right random 360" }' A; ^0 @& W' A6 K
forward 1
4 d5 F9 j/ _# ~2 Q# v set energy energy - 1* [/ z$ U+ K, c
]
* d) \: c4 U/ d: y& Rend0 o+ B/ U6 b+ k. k1 v
to setup-patches
: R' b2 d! O; u) e/ n+ k) s ask patches [ set pcolor green ]$ `( ~: W9 p l* p( Y+ X
end$ z8 z) N q$ ^# U" e1 \
to setup-turtles& ~+ u6 m$ l0 x7 O0 d
create-turtles 100. Y# m3 O. C! W, U0 m# l
ask turtles [ setxy random-xcor random-ycor ]% r4 D) q2 g9 p; @* i- D' ^
end: R0 d% Y% L# u' x: }
to eat-grass' K9 ~# c2 w w- K" k9 ~1 Y
ask turtles [3 Y; I& x5 ~& N
if pcolor = green [
. v4 _" K- w8 i9 k( V set pcolor black
9 M. {8 U( v" `1 @; V set energy (energy + 10)0 P9 k- _) D1 f A% i* N
]+ J% L" w8 o% T" A% \; R
ifelse show-energy?$ m x6 B4 t( Q4 v6 a0 }! [9 v# I6 d
[ set label energy ], J6 i6 K/ _4 s+ p9 B
[ set label "" ]
* f- ]4 ?( o4 o+ r+ f+ ^ ]3 f! Z6 I( \: S* k; O( @
end
' W: B5 G. w. L0 X( fto reproduce- N I) E9 D% f7 m
ask turtles [
' V, B& B& K7 D7 c3 J9 B& C if energy > 50 [
/ X7 A! \+ @: M set energy energy - 50) m4 |. @: h3 g3 C. h
hatch 1 [ set energy 50 ]
% l: E4 K" Y: t+ }7 {2 C5 m ]
' M# u3 Q* Z& f( U1 R ]
. @! Q: ?3 ^+ o# S9 Bend
* p7 d. E; v; I2 q; m. W" k% ato check-death8 g7 v* N; d$ d) T( h: f+ Y/ [
ask turtles [. i E2 [9 ~- l! E
if energy <= 0 [ die ]
5 T0 E8 E4 Q0 D" s& B ]
2 k: l+ z" D9 w; J# Bend
6 C! s) e/ } b( [8 o& a6 Gto regrow-grass
K; C5 S; f' M% L3 ~) u7 c: T% W/ w ask patches [* V. `& J' p# _/ V
if random 100 < 3 [ set pcolor green ]4 ?1 Q* d- M9 s0 r
]2 d; x# p. r% D. M' ?) T
end
; R5 `; ^' ^/ b8 ^; e* y- v" Kto do-plots! p5 @2 T( i+ p9 Z. }
set-current-plot "Totals" J- v/ D) E1 I; R/ }
set-current-plot-pen "turtles"8 d8 K+ l6 f6 Z5 d. \+ |" o
plot count turtles
. T. E- F" x. q; H A. X6 P set-current-plot-pen "grass"7 O3 a2 T/ N# a0 f2 o9 e
plot count patches with [pcolor = green]
' ?4 X8 h* h, N( W5 }% h0 aend' t. v8 B' q" s3 R* S8 `. f
可是运行时提示no such plot: "Totals"3 m4 B( ~" V- v( _$ I; S
error while observer running SET-CURRENT-PLOT
* ]* X- f+ a3 T4 _ called by procedure DO-PLOTS- p: _$ a1 ^% s& ?
called by procedure SETUP( e' `# N4 r" `" ^ t1 X, ^& e( H
called by 按钮 'setup'
q+ d) X, ]8 S求大神解答啊 |