我编的程序如下turtles-own [energy]
: g: i: S8 V( t0 V4 Yto setup
( R' n# B+ _ B. { clear-all+ y+ t8 W. z( K- t, h( W5 M$ ]% N
setup-patches5 e( L0 c' y- `3 T( q+ {( P ]; G6 C
create-turtles 100
1 q9 E* L0 P/ Q( T9 D3 E do-plots1 k' N+ p7 \- ` K$ I: ^8 D
ask turtles [ setxy random-xcor random-ycor ]+ i3 Z( B1 @& h' w
end+ O/ z% V2 R" C% M* H# k; C `
to go
% J& X% `. X) }9 Y) c: A! U" h move-turtles5 `2 I9 {9 i5 l9 `
eat-grass
% b/ {6 h7 v, F' _* q2 ` Q reproduce8 m t$ |& j- E+ X$ i# I
check-death, U) n1 i7 c( r& _' w. f
regrow-grass
5 _- F. ~' Z a- C do-plots
7 D/ W- C8 y$ ^$ L8 u* b. K- Mend% v6 Q' |% Q* C+ P/ r8 Z
to move-turtles( y/ X# n; X7 j* l: O9 f
ask turtles [3 r" V6 l+ B }1 \- A& }
right random 360# s6 _5 v7 ?4 M
forward 12 g! G" [1 S0 ~6 g
set energy energy - 1
B6 {1 }' J! P% E2 ?" O( S ]
8 P* y- U5 Z! K" z' G* _+ c# i' Mend6 x* f5 \5 R$ D D9 L m- L" f O$ H
to setup-patches
5 R3 E: c0 i" v v" m3 J ask patches [ set pcolor green ]
( A2 z- m K( H" d% n3 Vend' Y! P1 L' c$ ]+ c% m
to setup-turtles
o& i, H8 x) w) }4 n! {. _7 x9 c5 a create-turtles 100
1 D* ^+ G( ]- Q ask turtles [ setxy random-xcor random-ycor ]
8 ]# t' O9 ?$ \" \; Iend
% Y0 l0 [( B1 A, n" b- [% Tto eat-grass( ?4 \$ S; n- w* d& `, x
ask turtles [
' I! p0 j, o. z if pcolor = green [
7 Z+ @) q7 B5 Z+ w+ [ set pcolor black* l) h3 T& {: }$ n, C; L
set energy (energy + 10)- t# C1 ]) }$ y+ B! S, k+ [$ v
]
: e" [& U9 R P. p7 h: r5 T ifelse show-energy?
+ ?6 S# Q9 ?3 J. \& h [ set label energy ], w' y1 J$ Q- ^7 \3 b& E- F% V6 Z
[ set label "" ]
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end8 t* V1 h8 C2 v" k; v' p
to reproduce
* F9 s, o" ?) o% B* a ask turtles [
" u Q4 a3 K8 A% d7 | if energy > 50 [) E- S; }$ g3 ]; L+ L) y
set energy energy - 50
( }6 D5 l6 X, G2 U hatch 1 [ set energy 50 ]
% d, A, c6 l7 P* l$ P/ d( y- d ]
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end+ P- R& F1 a8 o. r" w
to check-death
! u1 J! z+ s$ M$ @8 N/ U4 `' K* z ask turtles [7 y: z y9 S; Y! X, a4 w* ]
if energy <= 0 [ die ]2 P3 R( ^% ]6 D+ B/ d6 W' X
]2 |6 r6 {6 ], ^ g
end
$ J2 H" L9 \6 d1 bto regrow-grass
1 d8 e4 u+ d# z0 ?. t9 @ ask patches [; k( e" |! ] _
if random 100 < 3 [ set pcolor green ]. e3 L: E: R7 t ~
]
+ P* \6 W/ }& n! L" D" Rend- |; C% i7 o' b. `% V4 X
to do-plots7 @2 L7 W- C4 i# u
set-current-plot "Totals"9 L+ ?% ]& E% J$ J- \
set-current-plot-pen "turtles"
' C3 G r2 \* j plot count turtles
* y5 F8 o5 K# V+ N% o: r0 r set-current-plot-pen "grass"6 b* D3 v& n& r& u# I0 _& M. ?
plot count patches with [pcolor = green]7 Q6 @6 ?$ d: Q8 x- V
end: }9 t. w1 u7 h( w; G
可是运行时提示no such plot: "Totals"
0 [' ~1 O7 ~; D# v2 c# derror while observer running SET-CURRENT-PLOT
J6 r) T+ y/ r. g0 ` B called by procedure DO-PLOTS# e3 I* z6 u! F; c2 w# X
called by procedure SETUP! V: J! s6 n' T& {' M
called by 按钮 'setup'
" I5 c2 I! }" @8 Z# X X+ g求大神解答啊 |