我编的程序如下turtles-own [energy]
* A! M Z6 I. H( [' `6 @to setup
6 R- t; v+ B& d w; N7 C# O1 M4 v clear-all: z4 Q' O8 Y+ I
setup-patches
) b4 t0 G) L: M5 n create-turtles 100
2 }! p! n$ F6 p: P! _1 K do-plots6 [: l4 t0 G2 Z% S" `% y
ask turtles [ setxy random-xcor random-ycor ]' o3 w8 e% o( |% u6 o9 T" Y/ c
end
6 f7 ^1 B; v% n9 y9 ^+ O1 ^to go
6 r7 w3 A# Z- p& q# ] move-turtles
) X" w# b( }; L# s( i, e eat-grass
: A4 l" E. D" @. C: }. R) h reproduce
6 F( c. b3 @9 C' i; i check-death
- [5 P$ ]3 _1 S0 Q D1 [6 t4 \ regrow-grass
9 D, L6 ^, m2 m, o( n do-plots
; p d8 |1 D8 O6 ~( hend T+ f! t4 b7 V) A5 ~- K. M" F
to move-turtles- d* n" g6 u X8 j4 H
ask turtles [& s) [, p3 j( P3 y! v
right random 360
; S/ T6 u1 h1 v0 x5 \+ @. S% | forward 1
1 g/ |. ~% i- x+ i2 | set energy energy - 1! X7 a$ {& h$ ~2 Y# m1 D+ |- g Q
]; t+ @/ T% d0 w2 D' S0 u
end8 Z2 l9 p# M1 D/ y6 u: K
to setup-patches
" N z* \$ ]( C ask patches [ set pcolor green ]
1 ~' n( `, L. o; b" J# v8 Tend
6 I4 D" d7 V2 jto setup-turtles
: K% g& s) [' ~% Z& J; F! o. J# U$ v create-turtles 100
+ n: N/ {3 |; s% ~$ ] ask turtles [ setxy random-xcor random-ycor ]! E: e O0 w5 C/ c6 o; U: }
end8 {: l& z: ^1 ?1 F8 d8 R7 H& K
to eat-grass: I- f8 m& k) @
ask turtles [1 K* A1 {3 E4 |! U
if pcolor = green [" X4 _7 \8 d1 r: B
set pcolor black
; v) M# ^' e- l set energy (energy + 10)
! v+ o. O# Y. T# ? ]
" f+ ? i& g( f: B X& m" [. Q ifelse show-energy?
, h$ A, S2 p$ I$ Z* {) {6 v8 @8 U% h5 A [ set label energy ]
6 w( }" m- Y9 K( b9 J" n- V' i3 ~ [ set label "" ]
; H( k' f" } N5 E* O) t( v ]: U3 j! A$ P# P! F! g
end. v; |( W# c" J
to reproduce
+ e# U/ `+ Q, \5 @ ask turtles [
9 R8 p* S9 }! ?4 W$ Q if energy > 50 [) i8 C' ]2 q5 D5 I
set energy energy - 50' d: e- C' t. p$ p% S
hatch 1 [ set energy 50 ]1 L- ~; j8 X* \' T+ _1 B8 G
]
5 g6 M2 ]- u% l3 s3 Q- t5 v ]0 Z0 a! m+ o7 _
end
. _' W5 d2 ]+ W% n4 b7 V# mto check-death
% y, b: L9 Y2 J7 z# A) B8 p ask turtles [
1 k! R0 `: G" Q2 J5 ~ if energy <= 0 [ die ]
: v* L, }2 P; X8 d6 I ], X; i0 g# ~( T
end' E* f+ w. f% a( s3 ?9 u
to regrow-grass8 B& c3 V0 U8 Q
ask patches [
) z$ F, _2 [% q* j if random 100 < 3 [ set pcolor green ]
' l2 ~7 _3 c8 H ]% I* v) }9 O5 g
end
p h, @6 B- T$ I! dto do-plots% B4 T2 I3 B9 d" p
set-current-plot "Totals"$ `9 V2 ?( z. J- s8 n/ @ l" Q
set-current-plot-pen "turtles"
+ c; o8 A/ b* [- Z; _ plot count turtles4 u+ G; ]; J9 l0 k
set-current-plot-pen "grass"
4 i0 O b: `3 m7 P0 ] plot count patches with [pcolor = green]: U7 t S1 ~9 w: @6 C/ A% B' J' F, ]
end
* j+ m U7 `: q可是运行时提示no such plot: "Totals"0 D; G; @; R9 b0 f0 E
error while observer running SET-CURRENT-PLOT
% W0 N9 n9 \+ x called by procedure DO-PLOTS
0 N) B9 c, W$ a! L' G called by procedure SETUP
; c' Z2 I) G, Q7 ^- q0 l: N called by 按钮 'setup'
$ J8 [/ n. e8 l) ?- c! {* V求大神解答啊 |