我编的程序如下turtles-own [energy]
, x5 {8 k; l t8 {. Eto setup
/ M; E" \7 t; s% Z7 h- w: D clear-all
; `+ X2 w2 I- w% F6 A4 @$ A4 N setup-patches+ N$ J( q! R+ Q
create-turtles 1000 r! A5 V' F C% C) U
do-plots
) m+ T4 [ I c0 V% H, ` ask turtles [ setxy random-xcor random-ycor ]
$ F. m/ F& b# I& i( n+ Q& nend: b" U) z# E8 {0 I( l X
to go
: K M& ?6 @2 A( i move-turtles+ m3 r. Q. z7 F& h; i: b
eat-grass
8 O( r& J* ]$ k6 O reproduce
* n% @/ g8 M5 o, u/ C5 e check-death, ^; M a' X2 I! Y* c6 m
regrow-grass/ h0 U* R/ ~& U' v5 G v
do-plots
% G* @* j C; c6 t- t& tend
! f. Y1 b2 o& pto move-turtles
( z f; m1 k5 r4 G% E% k& t ask turtles [
4 s) {* }* X# ^' n' u right random 360" U* W1 Z# k7 M* Q- R. u' M3 e
forward 1
2 t+ W9 D. u! {( m set energy energy - 11 j. l( f- e z) o" \ v( X7 p
]
; b+ G/ i# V7 w" Lend
3 K9 _; O9 I) ~% t) l2 nto setup-patches
8 L* K# P0 a* A0 F% z ask patches [ set pcolor green ]" Y4 r2 k+ g8 O! D; F R$ H6 R, F
end( [" w" v( u3 e5 ~# \! F
to setup-turtles& o) E) Z# Q5 N0 F5 U. L
create-turtles 100
( R. f3 G* f( ^% q+ y ask turtles [ setxy random-xcor random-ycor ]
0 O5 m; Y \6 O% {, _' M9 L! bend
+ j4 L0 |6 s9 R& ]' w4 X7 X+ ato eat-grass0 X8 e1 Y) v9 C- z/ [' {
ask turtles [
% o. c' V' ?- \) `1 n5 z! W if pcolor = green [
s9 e2 M* t" E6 k) j set pcolor black
# | Z: P9 J ? set energy (energy + 10)
7 B; P7 h" ~; \ ]) _. {( a* V) X& A
ifelse show-energy?
- i& v7 U! c1 E- D* z# f [ set label energy ]
; { H1 \" T V% w ] [ set label "" ]
6 ]3 [0 h$ q b$ I# ? ]
; a: j* W0 l7 I$ Hend
5 q6 F$ x$ n3 g/ Pto reproduce
. y6 i$ Z1 _5 j4 }& _4 O; ` ask turtles [' P( M- P. a* W. U
if energy > 50 [
8 Y4 R/ B, m7 Q# l" ^; d set energy energy - 50
# ~9 I/ D9 U# J1 v M hatch 1 [ set energy 50 ]
; F9 S- L+ N8 E; C, p( n0 a+ S ]4 t0 N4 k" q5 X* D' T4 z
]
/ b! U; A ?2 Kend
2 E( u' r7 {# rto check-death
9 R5 P5 O4 X( f) C" A* D* n2 f ask turtles [2 s R6 R6 N4 I2 `' i8 u" E5 g
if energy <= 0 [ die ]
+ C1 L$ j+ t5 h% s ]) l# G7 a0 I5 W; R5 g R
end+ x' ]2 y6 _5 I! C& I
to regrow-grass
1 V6 d' z# f0 d, \# |& B. X ask patches [
+ W' P1 M7 n* [* j5 w; ] if random 100 < 3 [ set pcolor green ]; X( M+ ]- ~1 s+ r( |* y( X4 `2 u5 W" J
]# c: t6 m+ R+ L
end
( A) u( b2 G1 @. ^2 ^! j4 c0 cto do-plots6 g+ J* |' ]; G; z8 Z
set-current-plot "Totals"' E( v+ c3 P5 M- l
set-current-plot-pen "turtles"
& {5 w4 B% S, e* q% e7 r( O plot count turtles0 G( @4 h! I2 k3 e' u! z, m' ]& {$ K
set-current-plot-pen "grass"+ W& j$ T6 ~& I, ]! E9 W" r- A2 _
plot count patches with [pcolor = green]7 j, `$ r4 V/ n8 y( _% M
end% m% D# l+ G0 N
可是运行时提示no such plot: "Totals"
, n$ D/ T4 H% v8 W. T/ S7 Lerror while observer running SET-CURRENT-PLOT
; b: F- `4 K! E9 O. p, @& ~! g called by procedure DO-PLOTS
7 q% V4 m) _4 v D7 ~) Z called by procedure SETUP, l! K! N! X. l8 a: q# }
called by 按钮 'setup'( D w, J: W! U* I% K i5 v7 i
求大神解答啊 |