我编的程序如下turtles-own [energy]( m0 P+ _2 M+ Q* x8 D; B0 u
to setup
B6 U3 e; b5 W6 Q clear-all# y1 d9 c- B) Y+ s( I3 O1 t! e; q; T( n; o
setup-patches6 f& I! O6 j0 y# q+ ?8 R
create-turtles 100
$ r& x q9 z/ G do-plots
; O& i( W4 G/ U$ w/ f ~2 d8 L ask turtles [ setxy random-xcor random-ycor ]7 f8 s& U0 Y \% x4 ] c& l
end
1 c3 o1 l% F0 d5 C2 Jto go: V$ _1 ]. {, U, S! }, l# H
move-turtles# j& O3 J8 R8 A6 I! k! Q1 ~; Z% K
eat-grass
7 y) c: |. S% c& c" w Z, ^: d reproduce4 _- W: K4 O( c
check-death. u, B, [2 O$ P6 M. d# M5 x. ?
regrow-grass
8 t t" f2 w% v6 z" V7 M6 R do-plots
/ a. u5 { s: q6 L! T, `( Rend
% \ m2 C: k( {# r2 f9 nto move-turtles
: j7 W/ p( N2 ]; ~7 c6 r) A- M ask turtles [7 h" K: G) n; ~ ?" S% q& e/ x
right random 360
8 L5 g6 d% g8 M+ W; \" r forward 1
$ }& {) ^% H1 D set energy energy - 1; p% }8 r7 }- E* [, ?# m2 v
]
1 @! ?+ h# f0 m: y: xend; }+ _- b/ C& i" l, W [8 U" J* F
to setup-patches! x: K+ e$ C5 D- O: F
ask patches [ set pcolor green ]6 z- P7 d x, n. r
end
" E' T; J$ A) ~$ O, ^: _to setup-turtles
+ i- ^: m1 m' M7 g& B7 Z create-turtles 100+ a5 M: L! @; R* g; r2 }7 X" ?! g( g
ask turtles [ setxy random-xcor random-ycor ]; q' \2 C# C$ f: c8 V
end4 ?. V* s D$ V7 f( f
to eat-grass
, e; F4 J/ b5 a/ H) A ask turtles [ s$ a+ O# T0 O$ T
if pcolor = green [/ f1 U. ]6 a" V8 r9 `; |
set pcolor black- O. M, L/ R" @# i1 j! n% P
set energy (energy + 10). N4 z' R8 W9 L# N& [9 ]7 p
] a. d/ }$ r( g( }6 g$ ^8 q; W/ t
ifelse show-energy?$ ?9 H4 w. j! P8 d" V2 l
[ set label energy ]4 P( W3 Q% E7 {; d* y- @6 X7 V
[ set label "" ]
K! b/ F0 x- b& l7 x ]
+ I. z) N. _! ?$ I T" G- z) zend
) A" X/ e1 l, z. U, X* cto reproduce% J& n% k( Y1 I; e4 h
ask turtles [& ]5 H% e8 A/ [3 [3 |
if energy > 50 [
" r" E1 \' ]. D0 S7 }' L! C! c set energy energy - 502 V0 w/ ?8 M# E
hatch 1 [ set energy 50 ]$ g3 O1 h( q" k# o" z# Q! V" d+ d
]
. C3 I3 G3 r$ Y U( t4 h ]
7 v/ ? A; S! Z; \3 u2 N8 x1 d; hend
1 r+ s `9 \* h6 T6 nto check-death! _" L9 n( K% f) W" \* i
ask turtles [
' i0 g- A5 Y2 o$ J6 j if energy <= 0 [ die ]
( h0 W- }+ g: }3 B* P% k2 L- I) V ] @- \4 O9 m6 p) }( t
end6 v% o5 L$ I; S' G% s: Z
to regrow-grass, K% }5 J5 Q' t3 s# |& m
ask patches [
) [% D4 f$ t* r! M/ P, K if random 100 < 3 [ set pcolor green ]
3 ]/ L2 K, ?# h ]
5 W# V6 [; J2 ~) Z( x! Y) eend
# w4 z3 [, j; P1 ~to do-plots
q7 J$ u, q1 w; u3 u4 m set-current-plot "Totals"
3 L7 F; E7 r7 D1 y0 d* g0 Z set-current-plot-pen "turtles" f) x& R. |: H& d0 [
plot count turtles
0 Q# f- d! X$ T w& E/ I9 } b3 k set-current-plot-pen "grass"
. W9 N% ^9 a% e plot count patches with [pcolor = green]9 R0 F0 Q% `+ f L1 u! l
end. Q ^% ~% l: ~2 N/ G4 s
可是运行时提示no such plot: "Totals"3 r5 d! b4 U+ i5 W- T& `
error while observer running SET-CURRENT-PLOT+ i0 M3 C, u( m( p* ?3 g6 p9 O
called by procedure DO-PLOTS9 N2 L+ s& f# P( X/ m$ f* r
called by procedure SETUP' i! i8 H2 s( \1 O* t
called by 按钮 'setup'
* X z& a3 P9 V# t- I求大神解答啊 |