我编的程序如下turtles-own [energy]$ W5 [7 V9 M1 w7 l7 I+ x q/ A
to setup! r( F3 O s* S4 @6 @1 l
clear-all, h6 Y+ S( A) k7 S# P) p8 H( B
setup-patches" y5 ?& w- a9 [8 _ g
create-turtles 100
* c5 y+ f; m: G( V( d3 F do-plots+ c& N& A4 l( O$ f
ask turtles [ setxy random-xcor random-ycor ]6 k6 s7 o" V& W' O- T) w7 s3 D
end F; x5 q8 A* F6 B- l! h
to go
2 c$ v3 [( o6 W, e: B. }6 s move-turtles
% `6 f' k" Y$ C eat-grass
& w5 V6 N8 \! @" x! D reproduce% u! p6 F+ ?9 r4 l4 [
check-death
. _7 D: C9 m8 p; G% } regrow-grass; g1 ~; P5 v r* L1 [' L2 V
do-plots
" d: G( t# m4 K0 I$ qend. O6 @& Z! Y+ E" d4 ^, ^6 Q
to move-turtles
( t, b% F/ q0 G* e$ b8 u2 o! K: I ask turtles [1 |* |7 e) c- A" _! l" K, S
right random 360
2 c# Y }9 E1 | forward 14 W* }: _0 L* d! O7 d9 e+ K
set energy energy - 1( b* n. G% `" X$ `7 S6 ^' y
]
# P* j4 U5 k$ R* Jend
) H, `' ^$ Y* }9 s3 g( mto setup-patches
( z& x) f `/ v" G) W ask patches [ set pcolor green ]) y1 s% x6 ]: C: L1 c
end
# f& x, L4 @0 Q, nto setup-turtles8 e/ ?. w) J- |5 w# `! A! l' n
create-turtles 1000 O9 `+ |/ C" N7 R
ask turtles [ setxy random-xcor random-ycor ]
/ Z8 i% z, {5 s& z- rend- L0 f9 L$ }" C$ g* s5 H
to eat-grass5 x9 R1 P7 E. s' A) l; o
ask turtles [: ?! y8 i% z7 y+ ? v, C
if pcolor = green [
( z0 b& x* m; X- r. `$ Y7 O9 S- |! N set pcolor black
' t2 x+ L/ {9 |7 t3 t0 C4 e# w set energy (energy + 10)6 M" [# C; h& b2 z, E
]
6 r( [, D5 W; l9 C* E: \! Q ifelse show-energy?
; l2 G! n: n2 | [ set label energy ]
- R! ]7 s: H+ ` [ set label "" ]
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end
3 A4 v- Y# j0 V( rto reproduce
1 M v5 l7 L- w, d ask turtles [ ^# V5 V, s7 n h7 U. D+ n9 A' T
if energy > 50 [1 B) d$ k3 v( F( o
set energy energy - 50
- x# O0 F4 ? t5 Z H$ u2 F8 l hatch 1 [ set energy 50 ]9 M' A) B% E7 |+ l9 t
]
) [4 m2 ]+ w1 m3 f ]
; k/ z. N7 A3 pend3 h+ s5 L$ M/ M9 ^5 j' S9 }4 O% z
to check-death+ o- _3 Q2 G3 s% h
ask turtles [0 g; {4 t/ V3 `
if energy <= 0 [ die ]
% g; M3 d% B. X* n- B ]7 F& q5 v2 U* v# o$ W
end
& ]1 j6 M/ M/ C5 F0 K0 E0 Q+ Sto regrow-grass
3 P( k1 }6 z! U# k) l p ask patches [
L8 x' K5 e- i if random 100 < 3 [ set pcolor green ]" o! M* w, T- F4 K R& D# Y
]
, }/ f( U0 H; Pend1 _+ Q4 s( N% b9 X1 V; s5 W- z
to do-plots# T! [( `& d* Y# Z2 V
set-current-plot "Totals"
) s" g7 c6 B: t+ n' x- F" a1 z } set-current-plot-pen "turtles"' j: {8 j& d+ c- k
plot count turtles" W/ ]/ |0 K4 j6 f3 r+ d- D2 t
set-current-plot-pen "grass"6 x/ J. ^. M! @+ e
plot count patches with [pcolor = green]
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可是运行时提示no such plot: "Totals"5 ?/ ~5 W! \/ Z
error while observer running SET-CURRENT-PLOT
7 F/ \! q# I6 Q) A) N called by procedure DO-PLOTS
! V% A1 O* u! P; M4 ^* B called by procedure SETUP
$ ?5 e0 d( P: ?6 R) A called by 按钮 'setup'
$ ]& d9 N) F$ `# ?: N) p求大神解答啊 |