我编的程序如下turtles-own [energy]; S$ q8 }3 w7 m% I
to setup/ z1 S# W U! Z7 j4 E% s
clear-all/ l0 K9 L7 d" j+ N/ G; ?0 z+ ?
setup-patches8 v0 i- F' U* I$ ?" L h& d
create-turtles 100
6 L8 l7 S3 d3 p do-plots( f& p0 O& p$ j i( B0 U, G" V
ask turtles [ setxy random-xcor random-ycor ]/ K+ f9 Z' y8 _6 q: E+ U
end( w, _ I9 `$ H) }( _ @2 X
to go1 t' q8 b' L& [
move-turtles
" [5 ^6 o3 U9 T7 A eat-grass
' @# j- g1 t G( K% o! ? reproduce
9 w m$ W$ p6 t! f( R7 c check-death
' q# w# Z5 i' |! \% M( z; @ regrow-grass% ]; H' ?0 _( ?+ I. @4 d9 {
do-plots
w" l+ C1 n0 q9 g+ P+ V. send$ n) ?8 H& Y# S2 E! \& P# Q/ D* @" \" e
to move-turtles
' T# W. ]8 X0 a( W, ?5 ~ ask turtles [9 K& ]0 |& m5 m( [/ d2 ~9 H" [ M1 I$ R
right random 3608 M1 H" N- X$ D3 z3 J# {7 p& W
forward 10 S$ \8 l8 M* e6 ~& L7 b" p5 _
set energy energy - 1' i* Z$ J u( a# T0 R( i/ c" l
]
2 M9 o% Y1 v5 iend2 v' Y# V8 c& F* d9 H; v
to setup-patches
( S5 d0 A7 o) L1 [2 b ask patches [ set pcolor green ]
- o2 R( A8 ]& Q6 Uend
6 e, w+ B( X# C: w8 x# E# h& {6 Zto setup-turtles; E, J6 X9 E2 A( t0 F8 o1 k
create-turtles 1008 e4 V, Y: R* e* w2 ~" ]/ ~: ]3 X( L9 V
ask turtles [ setxy random-xcor random-ycor ]
+ D8 u b9 m0 Oend7 p. Y1 m* ]. j/ D* D4 p
to eat-grass
+ _- U$ U+ q1 w% r% q1 S ask turtles [% o- q7 E* G! F* M9 L9 W1 v d
if pcolor = green [
, n6 n# p. B. o6 l7 g7 Q set pcolor black
& G2 q' l/ ~0 B/ z% I set energy (energy + 10)& N( m2 R9 S+ p# i) H
]& j8 }" A( K& X3 C4 b/ L" s
ifelse show-energy?
- \% c; Y6 d7 b# W2 G. R [ set label energy ]3 p" C$ w! t. r3 L
[ set label "" ]
4 N. j+ H+ W! Y ]) c$ E# ?$ o! h, R$ | }
end
2 i3 G! z% S; s3 Fto reproduce2 i+ s; ?+ z" [8 G
ask turtles [
" A3 X; D1 t. x0 y1 s, z if energy > 50 [
8 ], Q" O0 p! s( Z: H- g set energy energy - 50
8 x' ^. R1 p- J: _( C6 L' |( s# V$ y hatch 1 [ set energy 50 ]0 `7 U$ ?* Q1 F
] c# l' y) ^) h5 ^/ [% Y
]
" |& C& E% H$ E) {# v' l, @end4 x0 e! P M" c9 E% n
to check-death" B7 N" R) [/ i1 j$ f m- J
ask turtles [6 A) c8 h1 R, m1 J m6 f
if energy <= 0 [ die ]
; |5 I, n8 |! h# x. O ]7 a u2 O4 k a3 ~; j+ U
end
2 V& z! H# b( G/ T9 m. \5 {to regrow-grass
5 N, `5 M6 S2 ]3 |/ K7 W; a ask patches [" D# L+ Q% L3 M, V0 u- ~
if random 100 < 3 [ set pcolor green ]
# w- ~. A! B0 o% x3 {5 Y ]
4 r3 T r1 V1 X% a' G* G- j9 qend
0 v. Y4 ~8 `* M& Jto do-plots
. L: Q. Q; }6 s+ c" Y+ t set-current-plot "Totals"
2 m& {+ c0 F% |5 U set-current-plot-pen "turtles"' q6 G5 [7 D, P; D
plot count turtles
5 [" m+ `6 Q/ b- N) O set-current-plot-pen "grass"
9 w2 ~+ y- s, m4 v plot count patches with [pcolor = green]. i) E( w# G. r# R/ x
end: a' P, n7 I* x: V/ b
可是运行时提示no such plot: "Totals"; _5 B. a( _) M6 }
error while observer running SET-CURRENT-PLOT
: U! j8 G- n/ _, v; K) _8 F called by procedure DO-PLOTS
1 j2 v: l+ ~: C8 p; s" x called by procedure SETUP
0 {# k2 _* S2 R, Q called by 按钮 'setup'/ y; K8 g( U$ n/ P* Y( w- i% _
求大神解答啊 |