我编的程序如下turtles-own [energy] ? k5 [* Z9 f$ t
to setup' e7 ^8 U* M; ?* x9 t
clear-all; C: T$ l+ }! s1 ~/ q( p* x
setup-patches
8 Y! _$ o6 K5 g0 m* Q create-turtles 100
- I' w& E# P) N, m do-plots
# e' o1 X" h! a" U; O ask turtles [ setxy random-xcor random-ycor ]
/ p2 ^- t8 P$ a; Eend& z& {+ |! [8 B; e; ~$ u$ N3 T7 k) n
to go7 M5 D- n2 `4 N% b
move-turtles
$ ]& O, W3 I1 c eat-grass
" V" o; g" F" r0 L! V+ [4 o reproduce
8 |3 \$ ]0 y8 }! q2 q) _ check-death
4 n% S6 ~! f S- W! a3 k9 c regrow-grass8 R+ O( b, L; \5 u; V6 T& r
do-plots% ^* p& F+ S; m! U2 M
end5 D2 V" U& Z1 `) r, H
to move-turtles
t8 v4 ~4 _. S* E7 n ?2 t ask turtles [
, w! ~$ w: e# ?4 e right random 3606 \% o* v" h: _( k9 T
forward 1$ h9 J" L- E4 c* ^" N
set energy energy - 1& [, L @/ z. b6 c; m9 C
]0 U' R8 @' | {, n/ r
end
# O3 U% z0 `& bto setup-patches
& I+ b9 T* r( { r* i ask patches [ set pcolor green ]
1 i5 A9 u& v: v$ S% |6 iend
( ^* z E- A$ X1 {to setup-turtles
# G" J+ d# l% ? y$ X" v create-turtles 100
! p* z: p! r3 x; i5 V, c: G ask turtles [ setxy random-xcor random-ycor ]
: p j! v3 l" {end
% Z+ J+ X5 W7 pto eat-grass0 }% a: P, k* f' d0 Y( O, Z5 M* k
ask turtles [
5 A) e( @$ L6 i/ e7 ~ if pcolor = green [+ h5 N( ?, a# [9 `4 m
set pcolor black, p2 y6 R* \5 e' H* q
set energy (energy + 10)
( T/ X, j; Q, Y2 k" m ]" `8 ?+ @/ i) B0 j; {. V& l& l/ t
ifelse show-energy?' x W4 Q1 z$ ^4 j
[ set label energy ]
7 {4 d0 _- B2 o; y( \. B [ set label "" ]
" {. K4 f* \4 g7 d ]& N2 h/ _, ?, h/ U4 _% Y, C' Z- O
end
6 s4 a! J U- O& e, _: X% eto reproduce: O1 g& s$ y& v. _- a
ask turtles [9 I( A1 r/ h) [6 f
if energy > 50 [
! ]4 W3 ~2 s T* ] set energy energy - 505 q4 Y! Y) P- d" y& h
hatch 1 [ set energy 50 ]
& s7 m4 v3 T# L( ~ ]( p3 v8 C3 k7 r' v
]
! ]6 j. P- T6 a% i& ?1 uend
# B/ ]% a* k: B: K2 rto check-death
d+ x* ]. |- a% a8 T" N ask turtles [0 ]+ C& z6 `( i& t. H4 m
if energy <= 0 [ die ]
: t7 F: b, \; H. K ]0 O5 T) u3 j" u1 L5 p9 U+ c: ~
end
7 d: R/ }" e+ _- G& C- Dto regrow-grass! }8 f# w' I7 Q9 V3 h1 p$ H
ask patches [
1 Z5 D: H& k( [1 k if random 100 < 3 [ set pcolor green ]
- V3 W' T' ?: T- u$ ?/ L0 _5 h( s ]
$ b( V4 V5 Y$ q( B8 tend/ N. {% p$ h( |
to do-plots+ X# @5 ?0 [1 K5 ^2 a: Z' T1 \
set-current-plot "Totals"% W! M6 S) D# g [# v
set-current-plot-pen "turtles"1 G- h) Q' e; i; K. |
plot count turtles+ q$ ]- e6 I4 Z* ~! L9 a; e
set-current-plot-pen "grass"3 m8 u) S5 i1 Y
plot count patches with [pcolor = green]7 r+ V0 `, V, T( x9 ?: P
end& w7 h& y& }2 ^
可是运行时提示no such plot: "Totals"
- y4 }$ V/ y: G: yerror while observer running SET-CURRENT-PLOT
% {1 U! V9 I o/ l1 {% _1 f called by procedure DO-PLOTS; b( i6 F9 c. f) i# B
called by procedure SETUP8 g! E7 g) f- K3 ^
called by 按钮 'setup'
5 K' W' x/ q! e0 W, A( A求大神解答啊 |