我编的程序如下turtles-own [energy]5 P$ r2 n7 {5 U" Z! R: e6 @
to setup
: K6 e! a' I1 v' t/ y clear-all
: R5 c$ r# [$ y- g' D setup-patches+ r1 C! P8 b% ]2 l: t
create-turtles 1007 ^. y# p2 j1 p( v
do-plots
- Z: q- ?% ~0 s% j- J, n8 J7 t ask turtles [ setxy random-xcor random-ycor ]7 c' N5 K1 M/ a" M
end
: U1 u+ ?! }) {: U1 m' E- C/ Jto go3 j+ K1 p- K3 h! P( a1 R3 ^3 D$ T
move-turtles
3 E+ t% Z( M. V5 _) @" M0 s0 b eat-grass
8 [4 r, i2 {3 W4 h reproduce; R' F R* J% {0 u M
check-death
2 p, U. K1 u. Q x4 W# | regrow-grass
- A3 U. H T* \+ V+ T! n* m5 L( ` do-plots
2 i7 g6 @1 a0 \, H4 e' K7 fend
% W' Z0 t9 L: @to move-turtles
0 e. T) V; W* ?0 W4 V ask turtles [
/ v3 h* ~) F5 R7 X3 n right random 360
7 N) o( ~, K2 w/ s0 g6 ~0 K) P, x forward 1% y) c' n) h$ P. n& W. L
set energy energy - 1
1 q. u" T) @8 v ]
2 S7 F9 I9 b: r0 v7 m4 rend. [8 p' b! ~0 @# v0 ^2 \, [
to setup-patches2 K3 M+ `# V- P$ Z8 I5 s" Z
ask patches [ set pcolor green ]
" ], V0 B0 H4 j, t9 zend! Q! t7 k6 e5 d8 D9 D' _, T
to setup-turtles
2 I6 g- \4 `$ L9 n1 h2 a create-turtles 100
2 D$ M8 F3 I& ~; I$ O! }, ? ask turtles [ setxy random-xcor random-ycor ]. |0 g/ C) I# L/ t/ t! @8 B+ k, f" }
end
$ F+ A. g0 ?4 E6 a9 Nto eat-grass
; y G* Z+ G7 v2 E ask turtles [& \1 e0 p. F0 ^! J6 y- }0 z- e
if pcolor = green [
! K- v1 N- l; \$ @4 q set pcolor black
s/ f+ X" Q6 A set energy (energy + 10); Q4 S0 H" _$ @, l2 n
]0 Y: Z+ U+ I n( W
ifelse show-energy?
$ C' B% g. E% _ [ set label energy ]- g& a3 Z. I8 r6 ]4 k
[ set label "" ]- F, [$ X, ^" ?9 I6 ?
]
1 d# I& l; c2 f* B. Z+ F0 A9 Iend
6 e4 B4 E5 v% A1 ]& qto reproduce
# N) _7 C2 c! B. F0 u ask turtles [/ t* F! s* H, Z: C3 Z5 j
if energy > 50 [
- s6 z- J* a" ^7 E! V5 L( B set energy energy - 50
1 n' U2 o3 k3 e0 g% X1 G hatch 1 [ set energy 50 ]
% h% X6 l( ?, h, i: c; R G c ]
2 @8 t5 _( T& V; f5 _ ]
5 [- b( t. b$ Z& Aend C0 t! ?: c! L7 C$ k( \
to check-death
. p p$ a9 m. e: D2 k$ i m ask turtles [# d9 G( K: w' M0 O7 G
if energy <= 0 [ die ]
7 k' j J: o' Q h+ k5 K' Y5 V3 H ]- j V1 V! a, t# n' p
end2 B* T# C. U0 _* x
to regrow-grass
" X% L; i& B4 g, f! N) { ask patches [5 k4 P2 P, w% ^: x
if random 100 < 3 [ set pcolor green ]
W# k" j8 ?# B I" c ]
b, n; v L" Nend0 W8 Z8 F/ e9 L: D6 @3 l/ X' m
to do-plots
+ j2 m2 T9 E& x K, z A# Z/ S/ N7 ?$ o( ] set-current-plot "Totals", D3 S9 J8 w& y; j2 y
set-current-plot-pen "turtles"$ ~( |$ ~8 O G. ^" p- `2 v9 @ T; {
plot count turtles
" N& U m/ T. Y6 | set-current-plot-pen "grass": ^0 A0 e2 ?9 u; Q# e5 w% Y
plot count patches with [pcolor = green]2 T# @/ x8 q3 X/ V7 l5 q6 b( d+ M/ ?
end
! p3 [- @& I" t. o可是运行时提示no such plot: "Totals"! }! h: _4 F( z9 L% ]
error while observer running SET-CURRENT-PLOT3 [1 ?4 ]- x! I
called by procedure DO-PLOTS
' {: I1 d& [: k1 E" [ called by procedure SETUP
5 E' j8 b8 m$ o! m" u/ [3 v9 ] called by 按钮 'setup'! H1 L H. ^' ]& g) c7 R) ]: [
求大神解答啊 |