我编的程序如下turtles-own [energy]
% l, i0 z( K3 _7 qto setup
8 U9 r9 e& c1 O. B1 K9 W clear-all
4 {7 ~; l; U6 n5 h setup-patches
$ N/ m7 }4 a2 ` b3 A8 S/ a create-turtles 100' V: j, R7 S9 y: d
do-plots
' l* Z- n+ k+ R2 a ^+ g; p ask turtles [ setxy random-xcor random-ycor ]- e) b( E Q& c( k
end: h0 x v2 h! S4 a7 ]' D9 f
to go6 m$ r5 e- B& V) t3 ]! N! X
move-turtles' g+ p% d! I, \7 }
eat-grass' G- O4 A0 @* \7 e
reproduce& X4 ~8 K7 ~. u' b2 T, I
check-death
& g/ E+ J) W; X9 c5 q regrow-grass% u1 a$ [6 B7 P- V L+ I/ Q1 ]
do-plots
+ f3 i' |" L7 Uend, l# N, ]$ E3 B6 J# D# o) @( Q$ s
to move-turtles/ {( f) @" S7 `8 o3 L) s$ a
ask turtles [* g- F! S: K/ T; E
right random 360
, A( N1 n8 e( h+ {+ B) v1 ] forward 1$ D* S7 N; N: [+ \ I$ }
set energy energy - 13 K% p I- f. F0 }& c, ^
]
6 N! U8 K# j0 b6 y0 ?0 N. iend- w6 ?. K+ o$ |" @" e
to setup-patches' y p" m; `# [% J5 Y! S
ask patches [ set pcolor green ]; O( E' \7 _' {" U( G% I
end
& w: @0 y' j. \, pto setup-turtles# y2 j- f- \9 f8 U
create-turtles 100
/ n+ g o( }3 |2 r ask turtles [ setxy random-xcor random-ycor ]
% p7 ~ F3 ?$ d G+ _end
- _. U* E6 R! Q3 I; k( @* Xto eat-grass
- F1 r% l: }: g' ]( N1 ?2 G0 y; O% I ask turtles [5 j E' G* y7 T$ q6 }- q
if pcolor = green [
) M. \$ H; @. l M( j1 U Z set pcolor black
! s1 r- L2 E- N: R2 \1 J, M set energy (energy + 10)
( O. x' Z! P/ j2 X$ z" l* z* ~) N* E ]
5 R3 y1 d( L) E: m9 P9 J ifelse show-energy?, T2 |: z" O: Z% C6 x4 l' c' w
[ set label energy ]
5 s7 @5 z8 _' ] [ set label "" ]8 G; a! n" @7 ]2 B
]/ V. R- L. `7 c) R' A
end0 B7 [- r: t( r$ a; |7 H
to reproduce, l8 W" O! e7 h6 d4 ^8 N
ask turtles [
0 s$ S+ z7 q, N if energy > 50 [0 N6 G; ~2 c; p
set energy energy - 50& u3 a4 e' X3 k; S4 u# q
hatch 1 [ set energy 50 ]! l$ F& l/ H+ l4 S9 A
]
! x+ b _7 K( W1 H ]
2 t1 w) J( f% V e, O3 j0 wend
. m/ I- R, p$ K2 A1 l2 Q- t6 J1 N' bto check-death
0 z* g- E2 n9 E9 E, I4 g ask turtles [
) \0 R3 |# R% w if energy <= 0 [ die ]& l0 d8 Y4 b' N
]
n2 [5 B" p% ^# V- T( kend
* {8 c' ~( h n: a A8 tto regrow-grass
, E% Z5 d7 b' H: t: f/ N) S ask patches [4 t: u- `9 f2 C' o* M
if random 100 < 3 [ set pcolor green ]& J4 G, k$ [9 \: t8 L! B2 K
]/ X$ D; |) ~: S! z5 N: q! r' K
end0 a* ]3 R+ j% I' G/ P& d
to do-plots
3 D3 Q0 w, Q+ P, l set-current-plot "Totals"
' D, h% k% ^% E* l. `# Q) n) Q set-current-plot-pen "turtles"
% z0 A X+ |$ F* p0 K9 v plot count turtles2 y$ T6 N. z8 z
set-current-plot-pen "grass"
3 j8 L! R6 d8 _2 c& Q plot count patches with [pcolor = green]
+ l8 N( p5 `, `: T0 u& A5 U4 Uend/ f; _. j# T" ^4 U) j2 Y+ I
可是运行时提示no such plot: "Totals"1 N: S/ D. g+ C0 e9 x
error while observer running SET-CURRENT-PLOT
- A) I. y: x5 s! n& u' R called by procedure DO-PLOTS+ Q! n. V' x1 m" }1 Q F
called by procedure SETUP
, m* b' T( n" c% @ called by 按钮 'setup'" H" E/ W5 A% Q0 v* y9 B9 n+ P7 ~
求大神解答啊 |