我编的程序如下turtles-own [energy]
- B1 R" j' k, W" X1 [. f0 hto setup
( F$ t y" f) ` clear-all
' e9 H5 g1 M1 n setup-patches6 U0 j0 {1 v0 ~$ K2 x; r, N1 g
create-turtles 100. Y; f: _( S8 c
do-plots
6 T& H# c% O/ H( m/ a ask turtles [ setxy random-xcor random-ycor ]6 k5 z4 A" [% y: G
end; P: F3 b7 H- b9 B) U' a
to go
4 ~5 y7 A' Q( y9 n3 a8 F. P3 b move-turtles
) @% |- T8 u @! w eat-grass
3 Y# j/ S5 d6 z2 K$ { reproduce
: v) |- U5 f- U% L check-death* C- p: Q+ p! g* j: h) n; f7 U
regrow-grass
9 v% k B* [+ _9 E6 ? do-plots8 v9 v% w4 U: E* `0 v" e7 i
end) U+ F) d/ f! o `) X
to move-turtles
0 `2 { M2 c& t ask turtles [
. G$ w' k' M/ J' m: u; U right random 360
( K9 j' f! l4 F7 W" e forward 1
& g4 X" G% @4 _! L! u' ?. H8 o set energy energy - 1. z0 S: O$ v9 e9 P( e- e
]. a' B# K5 A' e
end
. W# z& Y' c8 t; bto setup-patches/ e3 k. L% q3 f" A+ b6 P5 |+ T* }
ask patches [ set pcolor green ]$ r0 Z( O: Q# j
end
+ q8 ^% ^; K6 n( Z+ u, @to setup-turtles
9 A1 ?2 z# |$ n! m- g9 P8 @- a7 A create-turtles 1009 Z) O+ I+ n$ V$ Z7 @( c
ask turtles [ setxy random-xcor random-ycor ]" @) U! I+ I/ U) j' D3 @) z
end; Q3 _9 ~ |" f. Q4 t z% S- I
to eat-grass
* K) H% h9 W! h5 S ask turtles [- {( M, k0 }3 n
if pcolor = green [
" j" v* x6 f% R' x set pcolor black5 ~- r2 _# ]9 J) s, W# A8 Q
set energy (energy + 10)5 O# E+ i& J: d8 p% |( b
]( Q4 d) p9 l) L: O( `# Q1 |: s b
ifelse show-energy?
/ A7 t k1 r- o0 o. M% G [ set label energy ]
5 X/ V2 `0 U8 J/ i% o; o* d [ set label "" ]
: U6 i$ S& L9 v! A% Y' s8 `5 O ]
8 W4 _; w A. _0 V: j9 C/ |end
: w1 `7 ^" a3 E& lto reproduce, s- r& f' c* U& E2 `7 o2 v
ask turtles [; @3 K" k) J- E) V t, C
if energy > 50 [5 u2 h0 N Q' S/ j m K2 ^" |
set energy energy - 506 a+ @6 ?- l2 Q
hatch 1 [ set energy 50 ]4 m) [' H% i' f
]
|4 ]/ z& n( _! t* H ]2 ~. R+ v5 Y. ] i7 d0 S' \
end
$ c x, o$ j [" D3 e% Jto check-death
& W6 R2 n( o* Y0 d: t, D# Y. a# } ask turtles [
2 Y7 h; V0 F, C+ W# N) m if energy <= 0 [ die ]
I, U1 ]# e4 c0 { ]
. o, _: [1 ` q# w& J* n* Hend
4 y- `. y6 A6 _to regrow-grass
3 f: B& F" j9 `9 j( b# |% D ask patches [* Q7 m0 s' D% F) j7 Q5 c
if random 100 < 3 [ set pcolor green ]. w: T7 W8 k+ ~/ b( q* ?& ~3 |! _
]* h K3 c5 z' w$ H# Z
end
6 k8 L y/ i* b( b& h: Kto do-plots7 S; K9 V! Y; X& W: Q# ?& O( i
set-current-plot "Totals"
8 ^$ ~' i) |7 C" B1 ^$ P5 S5 s set-current-plot-pen "turtles"5 `! f% M( b, X/ f# f
plot count turtles
% v, Y8 V j# D% Z% m set-current-plot-pen "grass"
% D- r. G1 O+ a. d& i8 h plot count patches with [pcolor = green]2 T! C+ F- ]+ S, F" g2 U
end- ]- o7 w0 d- a# J% l- i; x3 ?# V
可是运行时提示no such plot: "Totals". @- _" d) @. m v* r
error while observer running SET-CURRENT-PLOT+ R9 R+ o* h; u; ^
called by procedure DO-PLOTS4 y4 q6 m+ s: Q) e
called by procedure SETUP
2 W9 v# E! d: V) l, S called by 按钮 'setup'" S6 B" i1 n/ P3 x' f4 ?
求大神解答啊 |