我编的程序如下turtles-own [energy]& f& c$ D" m. E7 q6 b" Z X) V9 L
to setup
% ^, h$ o+ Q8 L6 W- {1 r; d clear-all
4 L( y9 F; _$ x+ O! P6 ~/ e. A setup-patches$ q8 h4 M- u5 y/ V7 G
create-turtles 100# s0 l- S5 a/ E- u# J* M
do-plots/ ]) q' s, T; ^
ask turtles [ setxy random-xcor random-ycor ]
' l' F- g: H9 D4 aend" J" N9 i% V3 [2 P
to go9 i+ d" U& C" d4 a! \! u! O9 f
move-turtles c% b+ g8 C8 J# S% n F
eat-grass
" p( J- W! d7 u' y2 z9 @ reproduce
% q4 P6 Z6 |- N! W, W1 e( U9 D/ v check-death. S, n9 r) S& ^9 [' W
regrow-grass
; e, a# S0 R( P do-plots
5 B+ }* [2 c2 S9 O' xend
' q$ c, p4 j) @/ [/ S& |to move-turtles
- ^4 m/ |6 L4 R8 T' T* E ask turtles [* K& H, k) g1 P; M/ }2 Q
right random 360* i, Z. \8 Y5 s$ X ?1 d6 i
forward 1* _8 X2 a- E. A/ Y7 Z7 V
set energy energy - 1
5 l; J8 n R5 G& F# b( M* G: [ ]
7 S3 `3 }4 u5 ^0 q$ l/ [" g- eend
0 y/ S: s5 k4 N2 @% K$ Gto setup-patches- C" {( h7 i- S* Z. f5 N! {0 Q: s
ask patches [ set pcolor green ]: c) ^' R7 s, F. j3 t% b# j
end
% ]" c6 c5 H( Ito setup-turtles; I9 N" C: o8 _2 t/ w
create-turtles 100
6 O, J1 B$ C: D8 D! r+ {- `9 d3 t ask turtles [ setxy random-xcor random-ycor ]
8 T! i1 C3 |( pend
% [0 I! X. y2 M! Q: F) c0 Uto eat-grass
. `" q: d9 D: v3 O4 o8 W% X ask turtles [
/ b5 |' S/ Z7 e: W/ P; @$ ~ if pcolor = green [+ z* l9 ~4 w/ l! _/ y7 w
set pcolor black- w7 F+ Z6 \: c0 s+ |! Y" a
set energy (energy + 10)8 y- y' U& ]; U# r
]
( r% G: @1 e6 U4 A( B" }/ f. V ifelse show-energy?, C$ N! T$ M5 D; A% A
[ set label energy ]
- `" Z- `) h7 e' S0 E [ set label "" ]/ M' v) g, E5 J- }
]- Y% k* q1 j" D9 r, l( N
end# l0 m: `; i- y+ a# S" g# c" G! {# y
to reproduce
1 A/ \2 B3 F D6 ] ask turtles [
5 i7 x; I! Q+ B4 V" K- ]" H if energy > 50 [! J8 J% d0 s& B6 X; e: I, v
set energy energy - 501 O o5 p7 H( I/ f
hatch 1 [ set energy 50 ]
7 M( S: H3 a3 o v! E ]0 x% n6 f% K' ^7 h4 R
]2 T, ]) z, |# p/ q0 q8 ^
end- G" B. x# C7 T- e) ~& O9 J
to check-death$ ~) e/ Z& c+ I4 c' \) ?8 s7 B7 {
ask turtles [& \" R) h7 U8 Q. A- Z6 u6 \3 \
if energy <= 0 [ die ]
2 D, T9 [( h7 @" G6 s ]
8 P1 Y" A; \) S- b" E5 mend0 o" b! e! j/ e. R* i% _
to regrow-grass9 d3 n3 [% x9 d- {3 J- b
ask patches [
. o( ^0 |$ ~3 P i if random 100 < 3 [ set pcolor green ]
' S# x. ~% j+ y! \2 C5 z3 X: Y ]: ?: I% Q1 C0 e
end
1 v% Q' W# C" ~6 Oto do-plots# @% P9 J% Q7 {* l
set-current-plot "Totals"
2 X. N5 Y. P$ v8 w& S" n" s% ~ set-current-plot-pen "turtles" A; g& E p% c
plot count turtles
% @* a4 d: }- D! `* L set-current-plot-pen "grass"
; b; {+ q5 u+ h plot count patches with [pcolor = green]. N& q4 {# E' U! w$ J: n
end
9 @9 _ i2 F& O) r; K$ D& G可是运行时提示no such plot: "Totals"
- Q) I2 f4 ?" T# W* G+ S( X R; Xerror while observer running SET-CURRENT-PLOT
# q6 z& A3 d7 M, j7 [: T; ^$ I2 } called by procedure DO-PLOTS* b$ h4 o/ \+ `- B T( u( K- i
called by procedure SETUP/ W2 k4 O* I* b% t H
called by 按钮 'setup'7 a0 m9 [- H& ]4 O
求大神解答啊 |