我编的程序如下turtles-own [energy]) V% \* S* r6 Y: \" y3 d" S
to setup
e5 q3 o, @8 v- Q4 A+ ~ clear-all, v5 `" m+ ]8 ~2 L% F- U5 n
setup-patches
q' N( Q! S8 t! g create-turtles 100: d7 k5 \ S) K
do-plots
( b6 z' p: N+ ~5 u4 q: q/ B4 x ask turtles [ setxy random-xcor random-ycor ]4 u$ v/ \* v- _. P: z$ N
end# b: K; w% J0 n
to go* Z% ?1 g0 ?6 s+ t; g" q B* m; J
move-turtles
% b+ u* K" |7 ~ eat-grass) k. P2 t! A5 \3 x
reproduce1 Y1 _, Z* w; E5 a: J
check-death
; R/ W+ k0 k. j1 Y regrow-grass U4 m H' h+ V( k
do-plots' j# L4 g* N3 R( u4 a* l+ w
end
$ z) k$ v, [6 B; P8 K' [0 bto move-turtles# L( b9 S0 }! ^' X, {# B
ask turtles [' c4 n% g" y& a4 ^2 y/ p9 j
right random 360
) A& b' O8 E# n6 {) N; w forward 1
: q: ?# d) U$ X/ g set energy energy - 1
8 ~5 }9 \! t7 x; r ]
9 p( d2 U2 r3 C2 G- r& e3 i) y9 {end
& o( d0 R% b7 V% O# {4 @9 L# Wto setup-patches5 R% G6 o# u3 o2 G/ J
ask patches [ set pcolor green ]6 V. I6 C! Z4 X0 _
end
1 D0 U& y" _- {5 \to setup-turtles+ w* e* o6 d+ L9 o# T% ` w/ \8 |
create-turtles 100, s6 R6 c4 R; `* B. d% D8 F& s$ z
ask turtles [ setxy random-xcor random-ycor ]
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to eat-grass
) z; d }& {7 {% m7 b: k ask turtles [
1 |+ t) g& b, w; F; V; n# O if pcolor = green [
, `+ J2 W4 y( c set pcolor black
1 @! P6 `! k8 } set energy (energy + 10)
/ R2 Q2 C' A, [$ [" X ]
; j r) t) J4 G2 C6 {3 J+ v X% N ifelse show-energy?% H+ |- i. ?- ?0 I. E0 c3 u+ s* X
[ set label energy ]0 l ?, N3 x- @
[ set label "" ]: U+ l: {6 a' W( h7 c
]* @+ q' q T; b z2 s5 \
end4 w: J$ z* y# }, }
to reproduce0 E$ m2 F: N$ F2 f |/ p" L6 k# [
ask turtles [9 J. b9 _4 V ~0 g0 j" I' b
if energy > 50 [3 `2 J. P+ ~# O; |/ [7 t6 q; R
set energy energy - 509 Z/ V% \# ?/ h2 l7 b4 P
hatch 1 [ set energy 50 ]; c7 ~: @* E1 d6 k, N3 M
]
3 n# v' _6 w1 f6 Z/ V$ A2 Q ]
" N) C8 E. o/ p2 J% cend2 C7 d: S3 ?1 f+ ]
to check-death. `0 K0 S% J# u' k* q1 ~
ask turtles [
, K/ l4 {7 S# A7 \5 N1 m if energy <= 0 [ die ]6 i- b5 r# e0 c
], L0 J4 s$ F+ J9 F
end
! ^! r+ ?! g* I4 vto regrow-grass' [, G, D) w0 z- O
ask patches [5 t0 C+ L4 _ n8 Q# {+ t3 I* G
if random 100 < 3 [ set pcolor green ]
, f8 p7 }8 c1 }0 |! Q X) W ]' Z" R* _: v5 u+ o0 X7 m
end
% }9 G' B M) x+ Sto do-plots: m* _9 u$ y& @( o, D9 _( u* w
set-current-plot "Totals"
0 v" n Q6 @" Q, [% f6 x H, \ set-current-plot-pen "turtles"+ X3 V9 s' G, C0 p+ i9 M
plot count turtles% }$ Q( I6 q0 r; z2 ~ h
set-current-plot-pen "grass"
! B4 n6 z# b, _& i- r# Q plot count patches with [pcolor = green]5 k$ q% R4 ^1 \
end" Q: D4 |! j! G4 j0 n
可是运行时提示no such plot: "Totals"- E) A# d4 P1 B% h5 S5 Q+ u1 d3 y
error while observer running SET-CURRENT-PLOT, `% A- i/ q5 b! k5 w& I
called by procedure DO-PLOTS) U+ {, U9 B" P* @
called by procedure SETUP
1 M G& x; h8 {# | called by 按钮 'setup'8 R/ U c6 M) F* q
求大神解答啊 |