我编的程序如下turtles-own [energy]# c7 ^+ s$ f0 \$ _9 X; x3 j
to setup
, t: A4 f1 O: ], J# ]. j J clear-all
6 G1 T9 K3 r2 u$ @; ?9 Y setup-patches
: Y& ]& x8 h5 i) S create-turtles 100
$ N" D P8 m! A0 h; L9 t do-plots4 L: i0 K; \ S
ask turtles [ setxy random-xcor random-ycor ]
9 p# T+ K' d+ M) M- u' s6 Xend
8 f }3 P3 p, g. _# j# f6 G* vto go
: g- a1 v( G9 f; f! m' Z move-turtles
# j t6 m u& D5 @& s# ~$ { eat-grass$ R r* u+ I8 P4 U* ~4 |1 c
reproduce4 Z( Q% a% @3 b
check-death
& ]( k2 ~! |: Z; g4 n regrow-grass
' `3 z8 j% [$ F& ~ do-plots
8 k" f$ A) Z3 ~0 gend
, y8 ?! M9 \& v" T4 v8 H! Xto move-turtles
) k5 r& W) |9 Q V4 {3 N& [6 t2 T | ask turtles [
5 ~7 x2 L% q1 U) E6 c6 Q& d7 k right random 360 r! Y: k- ^( b* S7 ^1 f0 A
forward 1( V N4 q) X' {5 {! g
set energy energy - 1
3 I8 o* h; d" q' O1 y! f, N ]
5 v7 I [" }/ D) x h# Z/ ~* tend- d1 c: E( G1 m5 M1 \( q7 w- e
to setup-patches
( M: z, @- i' j ask patches [ set pcolor green ]/ X7 d, G" |- _' V% M" X
end
3 @0 P) o2 Y* ~% U- \4 v7 o' Xto setup-turtles
. q9 L2 H( E, K: M: u create-turtles 100$ `" A5 k4 ~6 ~7 T$ v1 J
ask turtles [ setxy random-xcor random-ycor ]& k- v+ S5 d9 V+ P( ?4 y5 R
end6 y5 j+ V6 G1 t5 a; A
to eat-grass- u4 @5 A [! p p. n% [
ask turtles [; q" Q5 H. N. k1 j, J. E8 D0 ~
if pcolor = green [* ]3 J- i# n% h8 J3 y
set pcolor black
: q' F- S1 Z8 P# g% R9 d1 b set energy (energy + 10)( }/ p* [* i* }: v* @4 I* t
]
- Q7 R! `7 U! E4 G4 p- S3 y$ a ifelse show-energy?
3 s1 Q$ r' ^3 |1 L) i2 Y8 v- a$ \4 X [ set label energy ]7 K5 [9 T/ V- L/ ?
[ set label "" ]
; \* b) T2 \+ {0 X: w ]
" |( B. b3 [: E# s. i' n6 pend
. q$ N+ m- p! g+ Dto reproduce- K! G2 o; I0 E2 Q' H" H" n5 c
ask turtles [
0 D9 g, I7 A: W& h( q if energy > 50 [
( h! |0 w) j8 U: O set energy energy - 50/ S& X H( G, ~3 X* m! [; I
hatch 1 [ set energy 50 ]
# m1 R3 g& V& m" E ]
0 q+ \. }* I9 d) b ]; O* Z$ ?' X0 q* f# H2 o6 s. d
end, F' R, @" A" Z, \- Z
to check-death- b. h9 Y% g1 N: W2 m* E
ask turtles [# u& L" [, N3 h3 J: ]) s# R9 S4 i
if energy <= 0 [ die ]
; i7 C; n" @: @7 d9 \4 _0 b' S ]
& @6 Y! F( f3 wend
( x- M8 q- @% D3 [1 gto regrow-grass
8 Y0 f) } t* W& } ask patches [
% j% E z& ] ^ if random 100 < 3 [ set pcolor green ]* l/ A0 P& S( v- z [6 Z
]8 t* u J8 b* r3 Z3 k
end
* A: h2 b9 k" }# Jto do-plots/ [& P+ a5 I6 B% E* M) q2 F
set-current-plot "Totals"
. u; A% I( V( H7 i5 q# Z0 W; r% O: I set-current-plot-pen "turtles"
& I- W5 S5 F- ~7 c x( C1 r0 w6 n# f plot count turtles
: Y% L* G! G: Y ]0 Y' b set-current-plot-pen "grass"
" x j( H: c2 ?, I& V5 j# Q+ b' ` plot count patches with [pcolor = green]- Q. V$ ~1 `# |/ Z* G6 W |
end( C7 d+ P' n. p& z, H) M
可是运行时提示no such plot: "Totals"
: f: _' t' b1 z; b, c# j+ G; xerror while observer running SET-CURRENT-PLOT6 G# u' E8 g& @! e8 x$ l, D& p
called by procedure DO-PLOTS
; X/ ^8 f8 S0 D$ f9 T called by procedure SETUP! e1 @0 g2 v g# G" z6 h
called by 按钮 'setup'/ J( D7 u- e' f3 b1 S& s8 T
求大神解答啊 |