我编的程序如下turtles-own [energy]
! ?; \0 `. z/ E- o Uto setup% j9 U- R. C, O+ P, d
clear-all8 C( S$ G+ A( Q9 A
setup-patches9 G5 b( B$ |6 S: t m6 H* q
create-turtles 100
& o3 ~5 ~! ?9 s; S do-plots
; u5 u3 q' N6 q; u. ?+ S% ~ ask turtles [ setxy random-xcor random-ycor ]
/ a: ]$ W9 Y, m" j, f% v* i& O9 ~end
+ v5 b/ b- t6 |( J$ q5 S4 H0 Hto go
3 K0 ^0 N& R v move-turtles
7 r- f l1 q, J- D' K# f7 U5 v eat-grass
& _/ o9 l* @' N& u* ? reproduce
) w! p0 L) ~/ u5 }+ v1 ? check-death
" A7 q. `/ g1 @. {* V0 ~$ w regrow-grass/ j1 | H: n. i8 R
do-plots
/ q' H$ z. H2 P4 Mend! b* n; `: @/ z% n9 `( M
to move-turtles
1 W+ i- }* F/ {& K" X5 O6 v @ ask turtles [
7 o3 k% m6 \: Y/ R6 f right random 3605 Y+ m& D: J. O* s
forward 1( X y; L4 n. j
set energy energy - 1% _' x* _9 I3 t
]
0 f( J; N( |$ q7 d' E" {end7 O: {" I Z% W2 C+ A: g
to setup-patches" m0 z! i: j. d' P+ H# `& _0 s+ o
ask patches [ set pcolor green ]
2 m4 m. E- M% Z+ X4 g9 `7 Nend6 v- k1 h( \' h: n: M e
to setup-turtles
2 o, n* E" b# d9 K1 Q5 e0 T create-turtles 100
9 O4 d+ f& U# |: C4 s: p+ O ask turtles [ setxy random-xcor random-ycor ]
9 _ ?) B) J0 x* ]) Rend
\" a& V _, ], L) B+ f9 Qto eat-grass
$ Q6 _! X! ^. g4 K7 n ask turtles [* m' Z% z3 c3 \% T( H
if pcolor = green [5 e2 X; w% p( ~ }. h
set pcolor black4 S8 U. p! M0 X; x* W6 ^5 `
set energy (energy + 10)' a( _1 z# x, N
]
, y$ a) F+ @( [+ Y ifelse show-energy?
6 y) j; I8 ]9 F1 Q: S# ] [ set label energy ]9 x# z7 O5 d1 S0 F( I
[ set label "" ]
% N ^2 z) R( N) @# e% B# ^6 v( { ]% @1 V8 J" Z/ p+ @, t
end
* \6 b4 ?, \0 b- E& P Eto reproduce. g. s& D6 F" V ?/ P4 ?- s
ask turtles [. K0 t' h0 P$ i
if energy > 50 [
$ K2 _6 p6 b I: _5 `2 \6 d4 a set energy energy - 505 ?( \: Z$ h* x1 x4 @
hatch 1 [ set energy 50 ]
9 _5 g/ x: d* p- ^& z ]
4 m4 d# n5 Y- C, f ]
/ r% }( O! Z. ]# b* o y0 vend
; d+ i* ^& d, c& qto check-death
' c' d7 a& u; f( [ ask turtles [
& X. D7 l$ ?; [1 a/ K if energy <= 0 [ die ]
; T/ ]' f/ V1 Q- { ]- o6 W- p# _2 y, o' ]9 w6 s( n; k
end2 e! c3 y9 C% Y A! ?) ]6 z
to regrow-grass
8 s; U/ Y N7 R$ C, [0 x3 D ask patches [
+ K, {' m: T: g% j, h+ G if random 100 < 3 [ set pcolor green ]
" @4 z: D6 a# ?2 k, y ]
0 N& d* y; \" [) vend
B0 } t+ y& R, ?/ d% l3 Yto do-plots! K, p) v5 r& U/ O. G2 b3 K
set-current-plot "Totals"
1 G# H$ m$ }* R5 U; O" a set-current-plot-pen "turtles"
0 S% ?% ^( `! ~4 U) E plot count turtles
0 P0 k( w Z$ V# r set-current-plot-pen "grass"9 w. e5 ^6 T/ k# c% c
plot count patches with [pcolor = green]) ^1 `* m) a& X+ W
end# F q5 o7 u' g" _$ L7 J, }: W( u
可是运行时提示no such plot: "Totals". Y6 a4 K/ H+ `: r s
error while observer running SET-CURRENT-PLOT. d' ~5 p) o# X
called by procedure DO-PLOTS
; r7 J8 [7 z) }; k6 T$ M" R! q called by procedure SETUP
( S" H6 H1 `$ q4 L4 I; s3 S2 w& }6 d called by 按钮 'setup'2 J. i+ k* t1 Z5 z. k
求大神解答啊 |