我编的程序如下turtles-own [energy]
9 ?* {9 u$ H1 K4 vto setup( Y8 i5 G, w% A: Q
clear-all
0 z7 C4 j7 D& e setup-patches4 P2 e& M, F; r4 f- a8 i) s
create-turtles 100
4 w5 ^3 ?6 P1 h8 D+ c* [ H B3 { do-plots- h1 G1 L# H' }8 ?) m) Z
ask turtles [ setxy random-xcor random-ycor ]# N' f/ g$ _: K2 A1 O
end% B, G0 Q- [9 H
to go
2 b1 P8 R# d& I2 o1 J move-turtles6 Y/ @/ G. M, i8 ]5 ]; Z( V8 Q
eat-grass
+ Z4 s* P" J9 B& g) ] reproduce
" M/ i$ C6 x7 k1 Q, l8 V4 g8 q6 _) i2 F check-death
: E, Z4 x! `* J' @ regrow-grass
& T1 G1 }2 o: u( A2 A do-plots
6 V" b9 ~6 r5 r. r4 i/ i* p- [. ?end
5 v0 S) a2 D5 h# k9 U6 b2 N# ^to move-turtles
# }' L4 h7 P: ] ask turtles [
9 o" X/ ~) D6 Y: ? right random 360' C, s1 A$ z+ ?8 c
forward 1
" A, S- z3 _* M; t9 Y, M% p set energy energy - 1
& {8 K% o h& ]5 Z ]
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to setup-patches! D K- f( a/ q8 G( ~
ask patches [ set pcolor green ]! U, g' u. N! t
end0 A' E8 _: Q; t. \2 k% T
to setup-turtles
* n7 V* a; [* [" b4 J1 r# Z/ n: r7 C create-turtles 100
7 o# ^* q! c! d ask turtles [ setxy random-xcor random-ycor ]
3 P5 f2 V! c1 x/ q3 S J5 [5 Oend1 c$ b, `/ }. f2 q4 L
to eat-grass3 }+ E0 ?. R% w" q0 }
ask turtles [' S8 w3 O# d v; U# m+ D$ l. j
if pcolor = green [* Z6 a& N6 p5 u6 x4 q: f. u
set pcolor black0 Z! f( p% e2 _0 ^! E3 X" x
set energy (energy + 10)
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" R2 I3 h) o6 f! s9 }: Z& m ifelse show-energy?
; _ p: a* c$ F' r+ F, i% j [ set label energy ]- P, |3 Y7 {5 v' Z0 Z
[ set label "" ]9 `; Z- e$ q0 I; a2 a+ _
]" p9 @; R9 S& P; n6 R6 \
end
4 L! Q" G# Q% ]2 q# o% Vto reproduce" \" v7 L# ~' B' ~) B
ask turtles [4 T5 n) f& n" e4 v
if energy > 50 [9 E+ E& H+ ], x7 E& S1 q+ G+ S
set energy energy - 50; `4 B1 p7 O4 {2 m
hatch 1 [ set energy 50 ]
" s7 c6 v, d) |/ m7 a ]
2 ^5 a6 p- U/ I, {% W z ]/ }& L3 F! B; Z' I+ ?8 u3 y8 M
end1 D) P1 F5 J8 \% t# T
to check-death) R: \/ D( e/ H
ask turtles [) b; W$ e2 `8 u1 w1 s5 j4 ?
if energy <= 0 [ die ]( D1 d$ C+ ^% ~8 ?5 y- E
]
& z4 ~% r4 v. mend
: }6 Z4 F5 m. X; b, s/ dto regrow-grass
: E1 ]) B# |6 k ask patches [; c, L. d; |% M7 S6 q
if random 100 < 3 [ set pcolor green ]
% E* Y8 e' r+ w0 E% L& W- u ]
/ u! g( d5 t$ X# ]* Vend
0 _9 d* N; [$ A/ @+ s. q4 Y% ?to do-plots+ `. }( _9 q* ~7 L, h+ f# N
set-current-plot "Totals"
9 D" Q4 E' l) V/ ] S8 K set-current-plot-pen "turtles"
+ z; w# V) D! t, I+ { plot count turtles
# U ^+ c7 D, _% l) e set-current-plot-pen "grass"
, V5 F2 n- a! _5 _! ~0 u& U+ L plot count patches with [pcolor = green]
G4 u8 d: C2 B* Xend5 b$ x! ~7 D6 Y u8 }/ B: a; g
可是运行时提示no such plot: "Totals"% [9 C2 u# n* V$ {( [: u
error while observer running SET-CURRENT-PLOT
& I+ z J) j0 R" d/ l called by procedure DO-PLOTS/ L7 e" l$ W. B$ I/ f% |0 b+ R
called by procedure SETUP4 M% i" ~. G$ D% g4 T1 ^* X! B1 o
called by 按钮 'setup'; z3 h" a4 V. P. c! t/ e
求大神解答啊 |