我编的程序如下turtles-own [energy]4 r6 H, I# ^; N8 M) \2 y
to setup: m$ f$ o( I8 r' b, C4 h- f
clear-all+ b4 |% p, l0 v" ]5 m' h
setup-patches
9 A/ j H) X9 ] create-turtles 100
4 Y$ [1 y7 s7 _& Q4 c8 F9 c g" I, @ do-plots+ ]( C: \$ V( G7 o- V; O
ask turtles [ setxy random-xcor random-ycor ]. x! t8 E: I9 N! `& U6 J* Y. k
end
5 J8 B9 U P2 q9 Rto go4 g( e; F9 ?/ ~/ U: |' y
move-turtles6 B" p- v3 q' C: _- k$ p/ Y
eat-grass4 |1 D8 @% O+ Y- q) N
reproduce# O; M% a# A" l6 _6 ^# ^9 c) Y D
check-death/ a: C+ l( ~3 w% n
regrow-grass7 {5 ]+ D( I: x. e H) ~
do-plots) l4 s$ Z4 t Q: K
end
1 f) { V! r% v; ato move-turtles* x" W# N% _' l: P' v& W9 }3 M
ask turtles [
( i! M, y1 |- Q right random 3607 A" K: ^- }1 }* `$ J% S
forward 1
+ R4 t% N! Q6 g, W& j set energy energy - 16 n: ^3 ]3 P) ?1 O1 Y; X, i
]& f9 X9 F4 c( J$ {& \( B* G
end
3 F( g4 w. Y% [% e4 d. ]9 a- ~to setup-patches
. \/ h' e; u4 L/ a/ j. P3 V. S ask patches [ set pcolor green ]
8 I7 @; C# g S3 kend
- N& |1 \/ h# d, A) a+ Y5 y3 _. j3 sto setup-turtles1 a! {: ]* z2 g' `% R( T" {
create-turtles 1008 L! V) L1 p& m: }9 @
ask turtles [ setxy random-xcor random-ycor ]
$ |2 M5 f: e" C) T6 Oend
2 P0 G+ s, L8 A$ o+ r8 ^2 D1 Mto eat-grass
& M" D6 m" h. ~- P" a ask turtles [% f6 g% v# N: a& x3 P$ F5 [$ D
if pcolor = green [" t7 V/ M W' ~2 g
set pcolor black
) B1 B) E" W8 \- V/ } set energy (energy + 10)+ J8 l* T; ?# J/ ^' A
]' P* n5 ?9 i. N7 n! [# M
ifelse show-energy?
6 ^! _; e( [! T! T! q( z- O! ^ [ set label energy ]
4 q& ] g. D' [! u l [ set label "" ]
6 l9 j/ {, E/ Z7 x' \ ]7 H7 ?$ f8 D4 j
end) a) ^; s0 U) y- d$ \: L8 C
to reproduce
* u& W9 Y. T( a* `9 Y7 @ ask turtles [
6 c) n' @1 z- A: i if energy > 50 [
; B8 M( F) _4 @& H$ Z5 @3 r set energy energy - 50" V3 X `9 \& T. ^: R1 r! [. n
hatch 1 [ set energy 50 ]
6 j3 D. p3 }- T v5 Q* n ]
' X; S- Y( S% S& B2 [- p$ a% m0 ?0 @ ]5 O2 I. k3 E% B+ B( x
end3 S9 T' M: i& c4 H" ^
to check-death; x$ g& A; F$ p1 j6 S9 W% D
ask turtles [
' T0 @: {% [1 |0 x% w' v! X: D if energy <= 0 [ die ]4 H& f* ]) Y2 q5 ^; J
]
+ N6 j1 y$ W2 P+ L; ]7 Xend
( d D/ y a- r1 G1 r2 t3 P8 xto regrow-grass) P/ N( V. R, Z) V$ J1 ^
ask patches [
7 ]8 |% H" |; D7 ]- U# t if random 100 < 3 [ set pcolor green ]
1 Z- ]/ s: P4 F7 _+ `( t, q ]" q1 M S9 f1 G) j) S
end1 n' U3 G# ~; f
to do-plots# E& ^) m% _4 [# X
set-current-plot "Totals"" J! j' Z; s* F: K i
set-current-plot-pen "turtles"
- W' O8 w6 o! h plot count turtles
& u* @3 O: z' p6 Q X/ @5 [ set-current-plot-pen "grass"
* g @/ r/ F/ L9 @ plot count patches with [pcolor = green]6 U0 H' z P% U& v- H p3 c
end
+ d4 b. a5 d& ?& y3 a+ O5 h3 r) ^可是运行时提示no such plot: "Totals"1 l: A' v- z/ j) I" I# O1 w
error while observer running SET-CURRENT-PLOT
9 g5 c* i2 V# A called by procedure DO-PLOTS: N+ P) k4 e/ T
called by procedure SETUP
7 V2 [- @5 f% z called by 按钮 'setup'
! W; j: Z) h3 b求大神解答啊 |