我编的程序如下turtles-own [energy]: v5 ?7 ?4 L" w( k* c8 s& {9 \
to setup
# J+ j: Q) E2 d% u clear-all2 r* S. S3 _ a5 N
setup-patches
9 j9 m9 f9 f$ [+ T1 M create-turtles 100
% H) T5 x1 ]* A& i do-plots5 @8 f5 e1 c% E/ Y. C
ask turtles [ setxy random-xcor random-ycor ]3 M) U2 R" g. v' I6 W5 e3 Q1 l
end) b0 J$ u! c/ s2 h4 {
to go
! ^0 J, C# Y$ l/ t1 i" _* @) R move-turtles
+ f4 s+ ~; @1 O* N0 O7 D eat-grass. R. }8 W! s7 i! S* `! _
reproduce- m, t( a+ e5 k2 F, {; t" u
check-death- p/ M7 j" _( @' D2 L
regrow-grass- I9 e: Y0 F/ w+ T, ]3 |" t
do-plots
( L* I: S. e# V2 R* y7 a, c/ X6 r6 C# J, xend
1 s8 g: R- a- J. Q, sto move-turtles* T' s& o# M8 [% S
ask turtles [$ X( y9 U! |; F5 }
right random 360# H# B* K( a, g! z- A
forward 1+ w1 G+ X& B( _# Z0 f) D
set energy energy - 12 \+ q2 p: u; ]9 a, U
]
7 }1 x; r9 _/ ^9 Rend, L/ B2 A; R. @. U; b
to setup-patches
; d* h( f8 m7 t ask patches [ set pcolor green ]
# Z, F% P/ M, h/ Pend
1 Q; s& A, O1 U% Q+ jto setup-turtles
- @' ?' Q9 ]1 R9 {. S5 D; F create-turtles 100 h0 Y! `; s, p$ R
ask turtles [ setxy random-xcor random-ycor ]
1 v) D4 ?0 d# y. f" Gend- U+ ?7 i/ q) I" i
to eat-grass
. b0 |& r$ t; w4 s. `, C ask turtles [
) N& C% q5 h k if pcolor = green [
( N/ v. h; F; i+ G set pcolor black
5 Q8 o% F$ f& U( l: Y set energy (energy + 10)$ g3 y% } o. j4 B" J T' j @
], x9 B- J$ `$ v! y4 b0 J! V8 |
ifelse show-energy?
, A$ R. u Y& g, k) h v [ set label energy ]
9 h) X& M! t d: s [ set label "" ]
0 Y0 ?# |& d. I4 P ]: y- v7 f# r$ \; W- K. G
end
: T* I7 p4 j1 }: ^- J7 Wto reproduce$ M: r2 P# R9 i; D. I
ask turtles [+ x3 l' @$ f( C/ c5 ?4 }, h
if energy > 50 [
/ d* V$ I, L4 C: u5 c8 |& z3 T set energy energy - 507 H4 Q) l1 B1 `. a5 f, I
hatch 1 [ set energy 50 ]. J W. c% d }& W) U' S5 ]
]
6 Q) k" Y: d \ ]1 c& S: n# k& b- P
end
/ w# Y$ K' q% Dto check-death
0 o0 p7 a. s) ~, ]" b+ a ask turtles [3 Z" @/ i! L/ k5 Y
if energy <= 0 [ die ]- Z9 t. `, x4 V0 o9 t- _
]/ O. ]$ `0 H- q
end" Y( M: k N2 S* k4 d5 J8 f( \
to regrow-grass
6 a8 q3 u7 S$ ] ask patches [" Q. M8 J0 S3 x2 e
if random 100 < 3 [ set pcolor green ]
m) R$ v7 y5 }) ?3 k4 U ]
8 y+ _5 j% z: r8 R2 Eend2 _6 n$ ^% ?- e$ t& k
to do-plots
" u+ O# c; Y4 t5 e! n( G set-current-plot "Totals"5 u* w9 p; g' ^6 w, m
set-current-plot-pen "turtles"4 l$ p( I6 n" P5 k. o" U, A
plot count turtles
3 U! L) t" q2 m4 s set-current-plot-pen "grass"
h/ }4 l) g' m3 F& b. A plot count patches with [pcolor = green]! [8 ] B2 n0 {5 I1 i3 m9 y
end
- @: k2 y/ v1 Q8 w8 ^# k& N0 z( ~可是运行时提示no such plot: "Totals"$ {# J# `, {$ t1 }# i; {
error while observer running SET-CURRENT-PLOT
' @1 `! z# Z# _0 a called by procedure DO-PLOTS4 N: o1 h3 F9 [! _/ O
called by procedure SETUP
- N& S! O% ?% R" Q# g called by 按钮 'setup'
) }$ [$ `* ]7 o0 i5 d) r) t求大神解答啊 |