我编的程序如下turtles-own [energy]) \. H; i" f( E; i
to setup
. S9 Q% K9 o; N/ g1 [ clear-all
& }, R h1 X0 s setup-patches
: V* `' W2 ]; q6 N( I create-turtles 100
1 n) P4 w q, o do-plots
5 Q/ E! o8 V( n; F ask turtles [ setxy random-xcor random-ycor ]( t- s. Q1 M8 V. z' C+ {4 e, B
end2 d3 A, V, }" f! s
to go
. S1 F I; i& b/ x3 N" `: x7 a4 h move-turtles
' g" K1 V R3 K- e& a eat-grass
/ I( b0 d, t1 J" W7 p+ t/ _ reproduce
+ U% N& t; [( f* }5 R) c check-death
3 \/ Y. D/ j3 ~ q regrow-grass
2 p- L# y5 ?0 V do-plots* r- @, x% G$ u. W
end
2 _9 D$ C8 k4 P* g6 Lto move-turtles
( G3 }1 w6 t$ m; g7 A; q8 s ask turtles [
6 w0 Z! O0 O& }) v& a7 l right random 3605 A4 }/ c; M& p4 V) ?
forward 1
( x8 a( E8 R0 l# a5 W set energy energy - 1
O% G% Y% C( t/ z( \) B5 K ]
& M" r5 Y, `2 c6 n$ v1 J6 z- U; Wend
, W# ^0 E8 g" hto setup-patches- q4 [: u+ @- [
ask patches [ set pcolor green ]
8 U. P: ~4 x7 S$ m/ b" Rend% b( Q9 }( F, C! `
to setup-turtles, S3 M1 t! E8 }5 k& O
create-turtles 1008 H4 U5 v/ i0 j' ^% A0 i. u, v+ v( Y
ask turtles [ setxy random-xcor random-ycor ]$ a; U: c" i8 u7 x# g! @6 U2 ^
end
1 u& J4 E& ]! E: N3 Dto eat-grass
* u: b6 T$ |# m/ f' w ask turtles [
% f; _5 A2 Y8 t$ D if pcolor = green [: B# V2 ^* T6 V) Z# C
set pcolor black
6 T6 M( Q! {' n7 }! Y set energy (energy + 10)
2 x" C3 D/ W8 N; Q: K ]' h% z: i/ G0 x
ifelse show-energy?
: V0 v, H' i! G$ L0 d8 w [ set label energy ]
8 x4 b- u: N+ a! }( I1 C0 \7 {. l [ set label "" ]# O5 H0 T( o0 h9 T2 M
]
* O( J4 A% U5 R* \5 ]" O( Aend
0 m( u+ L8 G2 g5 h4 q* U; P6 e- h6 Lto reproduce9 q+ E- K8 I9 p6 Q6 _/ v8 N. S
ask turtles [
) c% ?) j, U* `! X/ N9 N if energy > 50 [
8 m' w0 L! e2 U: X# u% I% o9 \+ c$ @ m" y set energy energy - 50) q( z! }0 g" U, e
hatch 1 [ set energy 50 ]
1 b3 ], ^& x: ?- V ]
* R( Y z/ v3 j6 p/ { ]+ ?8 Y; [& S) q: d. G
end
& ?& T8 M2 ~5 c4 u0 Kto check-death/ T8 G! q2 Q4 J+ J H
ask turtles [: F& C" G8 g1 \- ~+ T0 Y
if energy <= 0 [ die ]
4 A e9 i: m, B/ _4 \ ]
2 B7 L6 D+ |+ Q6 g; D5 Vend, {9 z d3 J4 D; b
to regrow-grass1 f' e) I5 K) `. t+ w/ q! B8 G! ]6 E
ask patches [$ H8 h/ F2 O1 q1 _# @
if random 100 < 3 [ set pcolor green ]5 O7 ~9 X. m b7 I& B" a
]
" h, W/ X1 S5 `$ m8 j5 `% o1 fend$ R' S' B% M4 s7 H
to do-plots, H: u# U. C5 H: @
set-current-plot "Totals"
& t2 n' R- Q" N# s1 P3 w3 i set-current-plot-pen "turtles"- |0 q7 g1 N l% a
plot count turtles
. J5 |8 b3 \8 ]) j3 N set-current-plot-pen "grass"4 J2 z; T ]7 ~( I* H
plot count patches with [pcolor = green]3 q/ k, d+ w5 a
end0 p6 l- S5 O ~8 v
可是运行时提示no such plot: "Totals": p$ B! \, |) J9 v4 f
error while observer running SET-CURRENT-PLOT3 X# P& u/ d( [/ [
called by procedure DO-PLOTS4 i0 [) ?, W( O# T- `
called by procedure SETUP7 ?& \5 z' l' ^9 x7 D, g' `
called by 按钮 'setup'
; v5 B8 W# F. U T/ W求大神解答啊 |