我编的程序如下turtles-own [energy]
) q/ F4 X! X j) Kto setup
0 x2 m s1 b1 W clear-all
2 I/ r7 H+ y, k setup-patches
) T9 ~( e' V' d8 B( B, O) y# J create-turtles 100
4 r C" P5 G6 U0 f+ _ do-plots
8 ?* y9 h. h" N ask turtles [ setxy random-xcor random-ycor ]
9 `; B5 v: K L& x# q$ yend
9 h5 S8 x; d9 E" m: n8 Tto go
, j; y% r; O. w) e6 q move-turtles
! \# H* w: g3 S0 e eat-grass
) b9 L6 {) V1 Z, F" d reproduce U' [. u& v! n
check-death
/ x" F: t) |1 I) _ regrow-grass8 X) b# _; p) _( j" U/ l5 U
do-plots
. X# I: W- L! s% B h6 d- `% tend
* v6 J- Z: m# ?6 \9 L( {9 Z9 V1 r; z6 o; gto move-turtles
6 ]; M' A, U1 p/ {4 a ask turtles [
) D3 [# A* d' `, L: K) ? right random 3601 _3 m. c- w3 V( w' d
forward 1- G# Y0 u7 e x- R" b
set energy energy - 1( l5 L2 X) A. t: }
]
1 f/ D' u6 B$ Z# L5 m( j" U; g, \end
1 K, `4 e& W4 k4 u, n/ m( V W# Eto setup-patches O$ G; C' R! G3 @
ask patches [ set pcolor green ]
4 k3 {* x0 V* f4 |end1 `; u _8 {& q* s; w& i
to setup-turtles b# q& v8 ?( |3 Q/ o1 I
create-turtles 100( `. \1 n8 ?6 ]8 u' i3 n
ask turtles [ setxy random-xcor random-ycor ]; y, m+ T; g* M2 d
end: P) M* a. S: B2 |+ q. t
to eat-grass: Y* D4 [0 w: O+ c1 E Q
ask turtles [- U/ p; y2 q# k1 ^5 W0 I- X" ^
if pcolor = green [
; ~6 g, f8 l! n) z- u set pcolor black
: g7 [9 D, E) k) o) H set energy (energy + 10)
, [4 M& k4 W2 R8 t2 ~ ]
4 S6 r a q! W, X0 ~; S2 l ifelse show-energy?" }; I, x" h5 b% ~( ^% D' g+ j3 r
[ set label energy ]
9 R+ |# G0 o: t' Y [ set label "" ]
, D& Q1 q3 A, x% i" k& ? ]
}3 \2 A& J/ f; J/ j9 ~end8 l$ Z3 `9 _7 R, \9 P! g( J( R. M
to reproduce
$ w+ n1 C# y; r+ T1 @. p ask turtles [
7 D2 f7 Y0 G1 P, m9 { if energy > 50 [" d8 o: X7 v" t2 |( F% g& q; ]
set energy energy - 505 m/ Z. z- x. v3 B. F
hatch 1 [ set energy 50 ]
6 x0 c+ O. w# H5 c7 F ]: o" K+ v2 M* |" t; ^
]
, `5 h/ a6 Q& p. Z7 T3 bend# n4 d4 T& d: Y. s V/ [5 t
to check-death" `1 P2 x: M( E" k9 N
ask turtles [
4 P. E& o2 A$ i! M if energy <= 0 [ die ]
0 K. G+ B3 g0 f# e7 N# R ]
1 i+ V- A+ s/ ?+ m5 G: Bend
; i8 K2 V9 i* ~to regrow-grass
0 B( l: d0 A9 S! J- @" d ask patches [
# D8 g" I+ r! e* a$ v3 I8 R if random 100 < 3 [ set pcolor green ]
% B# a% c q& }- F ]
1 \+ M9 H- A9 c4 Q. y1 gend i* v# N4 O8 U0 v6 g9 P
to do-plots
1 \2 P9 q% S" y, Q% z2 b1 T set-current-plot "Totals"3 Q. q3 A6 O4 s) S
set-current-plot-pen "turtles"
. V5 ?* |; b2 p9 j, t plot count turtles
$ J' ?: u# w& C- | set-current-plot-pen "grass"
9 j1 ^, W1 y1 M; ?- ~+ i' ] plot count patches with [pcolor = green]1 y+ H$ D; ^: K; k) q6 ]8 {
end6 N1 K0 _' f" a: O% d
可是运行时提示no such plot: "Totals"
! S( X+ b* f- |; U, X$ }error while observer running SET-CURRENT-PLOT
3 B+ F' o5 w: D8 H. i0 r called by procedure DO-PLOTS
% J: u6 ~, n; `/ K$ B# o% D2 l called by procedure SETUP4 g- \6 S* W% e
called by 按钮 'setup'6 U7 u+ c3 t% W6 R, q
求大神解答啊 |