我编的程序如下turtles-own [energy]8 |* P( j7 F7 e# @
to setup
3 U' N% Z/ S+ j) Y; N" o clear-all
9 J) T$ b7 Q" C( X1 }7 I& i) e7 O setup-patches0 p* x) m- Y- u( g6 D
create-turtles 100
8 ^% p4 u6 w# p' `3 i do-plots$ q, V2 _/ D/ g) O' ?
ask turtles [ setxy random-xcor random-ycor ] Z% ?) H, n+ P% T4 |. q5 {. } [
end! g( q+ t- T) a% o* ^+ S6 B
to go Y( E3 t% K: Z" M l0 i; }9 U( l' s
move-turtles, R( B. }. C1 E$ P) W3 [( g
eat-grass
! O% F" O+ x V2 j+ D reproduce( l# r; m, @. g* z4 v
check-death
% ^, Q, {5 ^4 q+ A1 N regrow-grass
! _7 U( [* j: [- H/ C- q0 H do-plots+ B! B- N! `3 c$ R1 S
end9 ~6 O* ?5 v/ F4 K/ q/ W4 ]. M
to move-turtles
; N7 S' o; j+ z, N/ a' U! P; j+ R ask turtles [
% t" f( f$ o; L right random 360
5 }9 h1 b; X2 G$ s! W+ i7 i forward 1! j) \$ f* \& x6 @ K& A2 M4 @9 f9 E H
set energy energy - 1# b R7 {9 u( s7 ~" R& V
]
$ b1 j' K4 A0 d! l0 gend X4 t6 Z% P, P
to setup-patches. R5 @9 p2 T/ \$ s3 m$ B
ask patches [ set pcolor green ]7 ~, | l# L* p1 x8 \! K3 P
end" G' O! y! w* |& A
to setup-turtles: c/ B7 [! d, W' Z0 d# _) d7 w l+ |
create-turtles 100
. L& }" Q) y4 Y4 r8 c$ b ask turtles [ setxy random-xcor random-ycor ]
: y4 v+ m4 ?, `2 d9 g' oend
/ D3 D. t8 X5 Y& _3 n! ?* wto eat-grass
# D+ X, `+ }9 v; R4 M ask turtles [5 _" w2 a5 _( L \- U
if pcolor = green [: a5 c; L2 ~' v+ S/ A+ o
set pcolor black
! c' K/ F: N. A set energy (energy + 10)! g- B8 T! z% r! J3 Y9 o9 J
]
. L. `- @ ^. ]- S0 K7 c ifelse show-energy?
/ s( W- K! ~3 O" T) e2 g( C5 }8 J [ set label energy ]' O$ K) Y1 @0 |5 q8 q( y+ {0 J5 x
[ set label "" ]
2 @! y1 Q8 L. x ]! c( D! J1 C; b
end' ^. T, ]! Q( c" q
to reproduce
9 l" q$ ]9 m3 H7 \9 J, K4 n ask turtles [, O) [1 l! n, h
if energy > 50 [0 d0 _; j' ]4 [
set energy energy - 50
2 B- d& d) ]1 H' F" @8 T+ m7 M hatch 1 [ set energy 50 ]( @8 @+ D& f$ q
]
" K+ O- V8 b& f# A' H ]
. M6 P0 @4 \: A4 Y/ v1 e5 q" Rend
0 }( m k8 [. _to check-death
) `5 J2 N" ?" m; n5 P( I: D ask turtles [# e' v9 p2 Q m
if energy <= 0 [ die ]$ r7 N, @$ @" q
]; ~* C. T S8 d/ S$ x
end
: {( T5 P, W+ `! H' Z! N( Y5 vto regrow-grass
3 g6 s' J; J% Q) a( e ask patches [
& s3 W# I- u. \) ? if random 100 < 3 [ set pcolor green ]
# _3 O5 W' f# j! N: y2 T+ @2 ~ ]' H, S$ l" L6 L; L, p
end$ I7 G! I3 q' ?4 F$ }
to do-plots: g3 i0 x- W7 s' g/ y5 z9 e
set-current-plot "Totals"
+ S; O$ y0 o# o$ E$ B; r set-current-plot-pen "turtles"
9 u3 k" I! d8 ^) j0 B6 H9 n plot count turtles
; d+ l5 j# l' j: U E+ C set-current-plot-pen "grass"; b3 w* Q* k) W% x
plot count patches with [pcolor = green]
2 p2 i6 I" F# y) r/ hend
5 o0 _) n9 f2 d" j' Q4 `; r可是运行时提示no such plot: "Totals"$ | C2 E( |* c# r7 ^: S
error while observer running SET-CURRENT-PLOT7 c* W, u3 b& q- \
called by procedure DO-PLOTS
, W: {) }9 ~8 p" q2 r called by procedure SETUP
% G- B+ C6 p3 ]" k9 b9 k* l( s called by 按钮 'setup' `# y/ _0 v5 n& }4 j: c# [! W
求大神解答啊 |