我编的程序如下turtles-own [energy]
2 w3 [- X: \- X) R$ z) \# Sto setup
: C# a- C" f( u' o9 J3 Q clear-all. o7 G) j, v% l% F F, @) t
setup-patches0 E6 B2 h% L4 f: `; h
create-turtles 100+ S8 B7 V, |( Q
do-plots9 v# j4 d& j) y
ask turtles [ setxy random-xcor random-ycor ]
3 f. }9 R" j0 ]1 Q- Jend6 i& y: J+ d& @) H
to go
# R# b4 y/ [( k/ h8 O+ e% D move-turtles- N! u% u. }& B! U5 [
eat-grass
7 N; d* L# _$ r! q7 L reproduce
3 _: Z( G& J( w9 S$ C- A check-death
; x; Q3 v" X- L$ _0 y# Y regrow-grass
" k* ?7 {8 B1 B& u do-plots
! S2 v& u1 {5 N2 P$ ` S8 mend9 Z1 T* Q2 V* ]3 {+ u; a' y
to move-turtles
3 |7 q0 K; f) _2 @$ Q ask turtles [
3 d8 x! Q8 h+ r right random 360
0 G1 Q" ^6 |# \; g3 B forward 1
- M& L' \! j( i# e/ J4 V' A set energy energy - 1
4 P4 Z) c4 J; I1 n2 s# u ]
s5 c1 B* S) ]4 zend
' V3 I" z% n5 [- Mto setup-patches5 S2 O" n% \' ]2 Q' \
ask patches [ set pcolor green ]
] [! q4 H% f1 s, k" xend
) J3 E% a+ H* P- t4 ?to setup-turtles# Z# @% A6 h8 L
create-turtles 100
. }! N6 F) f: x2 u: A ask turtles [ setxy random-xcor random-ycor ]3 v* @8 G9 j7 Q+ n2 Y. R& t" q
end8 s8 E( b2 d* g6 a9 y0 u
to eat-grass
) b! q; t2 ~# M% Q2 G ask turtles [
- { e7 D P4 F' l% f) i& e if pcolor = green [6 F* c3 p7 o9 l2 p6 `
set pcolor black. O f1 S- |- `
set energy (energy + 10)% R( G! ^2 w; g% S5 J; Y
]
& \7 i! N( T6 }% s& w0 ~9 z ifelse show-energy?, r7 k: t1 E. D2 r3 b @; Z3 e
[ set label energy ]
0 p# d) p$ P3 |* a [ set label "" ]0 a9 R( C0 a8 x& t u3 Z9 Y0 E; ]! }
]3 N8 `0 k0 e1 |" W' S, K
end& D+ z; \0 T2 Y5 N; D8 `
to reproduce
+ C0 I. A3 [5 p8 |) i6 |# j ask turtles [7 K4 F: g: j; O( [& \0 \* Q9 H- g$ S
if energy > 50 [: |: p9 M' m) w$ B- l3 j5 m# p
set energy energy - 50) G6 n7 }7 N, f. m# `
hatch 1 [ set energy 50 ]" R0 S( x% Y$ {0 z* Y% h4 r
]
4 r$ M7 x0 |' G1 z# w ]
- m9 N( [ h" V( [2 p9 G( bend
0 S! @/ E' j4 Q% Q, {" f2 ?to check-death8 N+ O D5 X1 O6 B8 u( ~
ask turtles [9 q4 g: G! P0 W& d
if energy <= 0 [ die ]! k6 w+ u R5 ^1 U2 x5 S
]6 d" |4 \1 u9 r% Y! r- l
end
' e) [$ Q# n! k( b8 l- z5 Kto regrow-grass
+ N0 [2 ]' G" ^- r ask patches [
3 D) ?) K. X7 S" y6 a4 f' D if random 100 < 3 [ set pcolor green ]
( x2 h, g6 I1 ?& J- b) _9 ^8 X ]
% G4 y9 O W1 Z1 f$ F fend
5 {; R" n# A+ X7 E& ~# hto do-plots
" b5 g+ X* d ^1 ]) g$ } set-current-plot "Totals"0 [" V* a) ]! {9 m% H, T% i
set-current-plot-pen "turtles"
, o! G3 U) O; k2 F0 e9 X plot count turtles
}8 O7 |' G$ W0 G set-current-plot-pen "grass"' r4 @7 E3 @8 B) F. I# n
plot count patches with [pcolor = green]
- M1 Z6 e- a _, w4 wend
: ` n: G0 G. A2 R8 {* I+ [+ G可是运行时提示no such plot: "Totals"
: ~ M$ q; ^& w) herror while observer running SET-CURRENT-PLOT
' g' G% X% P% z" J called by procedure DO-PLOTS
4 N5 O4 I* B' U5 c called by procedure SETUP
1 K8 ~) D% d: z7 ^ called by 按钮 'setup'! y$ i0 @' Y& _% p% K
求大神解答啊 |