我编的程序如下turtles-own [energy]% d' C |! ~* l
to setup
5 k* K7 A" D) n" \- C) \ clear-all
3 i% `) C$ K: `( @ setup-patches
4 C$ y2 W+ A" | create-turtles 100. M9 o- i" e- l& T) ?" _
do-plots
+ @/ w: v: S6 x' Q. W ask turtles [ setxy random-xcor random-ycor ]# D% N3 l9 w' G, s- U
end
, X3 @! H* ^% hto go
, ^ [9 l! X f' W) ~' b3 p2 T5 b move-turtles
; ^7 b2 Q4 f; ~7 y' g7 I8 ^, r eat-grass
% y, N6 H' z4 s& m$ G: m/ u, ` reproduce" w# z, w" r3 ]
check-death: l6 ~" k4 k% _; C
regrow-grass
! I8 }, `4 ? G7 m8 S1 k9 I; [ do-plots {* {% f. w* R Z( l% T
end9 a' `; ^: [( s3 b, c2 z
to move-turtles7 e4 o8 J- }5 h" m# u L3 p: K
ask turtles [
4 |& v# G" z( u4 x, s9 f9 v right random 360! A6 y" ]" @. \+ u6 |+ m; Q) V/ Q6 ^
forward 1
6 g# L* S E" j2 |4 G& V \7 e5 t set energy energy - 1
! x0 G; A% {8 }3 f' P3 P$ [* E ]
' P& S" ?0 G* t; Q9 R) ?: [0 F2 Mend' ^ }9 y/ B& n1 X% f
to setup-patches# k, a5 U6 G) q7 N; ]2 Q) H2 n) i
ask patches [ set pcolor green ]
- x& @9 T9 J* e$ cend
+ U0 ^9 n' V' y0 S3 ~7 X* V. [to setup-turtles
! l+ z' U/ B. n+ a% l' P create-turtles 100
( j$ J% W9 ] R6 X ask turtles [ setxy random-xcor random-ycor ]
) t7 C& U0 J6 t2 s; jend
9 ]9 H% a4 ~2 R9 Hto eat-grass3 s0 m/ D5 Q' `+ n5 R, {
ask turtles [) i" K+ Q u j: p
if pcolor = green [
5 y$ i0 M+ a0 s5 k& ?( q' O set pcolor black
" R0 b3 O- E5 g) P set energy (energy + 10). v' `6 K6 I" ?2 K
]. i, l/ s" z, @ J% _$ b9 ^
ifelse show-energy?, E3 j S* J H( W+ A6 x* U
[ set label energy ]$ w7 G" A. m3 O a9 I/ Z3 u3 F& ]
[ set label "" ]
6 O K0 O1 X3 G; i% H+ X: e ]
( U: S; R+ y" J5 `: g8 tend! L: x7 ]! u: p7 C7 O% H
to reproduce% y2 \$ |! x+ Y6 _; K6 l d
ask turtles [5 X; k8 F1 A6 E; {
if energy > 50 [# O* Y C& g- _8 T
set energy energy - 50) b3 i2 v5 S. G
hatch 1 [ set energy 50 ]. b, U, b _, H' Z' j; {# N
]
3 N9 i1 ?' w5 B t* L# P ]* j5 D4 S2 B) `
end- x" K5 e( n) ^3 K, c8 P5 n9 i" R! z
to check-death: e9 N3 g; `0 J, `2 e1 L( v& m2 ?
ask turtles [
% O4 {7 R5 E, w2 q if energy <= 0 [ die ]" ]$ h$ S% t7 C! S0 i
]: B+ K. b1 Y4 F! \' o' m: {7 n
end
1 u) i; |% h; u8 \: _" m0 Ito regrow-grass
% ?$ P4 F6 T& X- T# Y ask patches [" O$ B! f4 q( U1 c7 y' o- v# m: i9 H
if random 100 < 3 [ set pcolor green ]
* B; F% j) z! I5 \# g7 I ]' `: W# ^- }4 [& I
end, a2 n/ \: F2 X \; D j o& @3 d
to do-plots
3 ^9 H3 F6 V4 V6 } set-current-plot "Totals"0 g0 l t4 J, f* ]1 x
set-current-plot-pen "turtles"6 y5 p. ?- }9 ?: @
plot count turtles `* y+ y; E5 L# _
set-current-plot-pen "grass"+ X% n' \4 x0 P; ~5 f
plot count patches with [pcolor = green]6 F1 `1 ]2 B6 w6 }7 K6 u
end
$ K# V. e+ j$ c& s( g T9 Q可是运行时提示no such plot: "Totals"1 Z q, V8 l k* t1 \
error while observer running SET-CURRENT-PLOT' ]+ l: m% |6 v! d* X, ]- R
called by procedure DO-PLOTS$ \. M$ \6 }" Q- z! n. `5 T
called by procedure SETUP4 [8 g9 h* T" Z# N
called by 按钮 'setup') f J4 {& d: Y x, j
求大神解答啊 |