我编的程序如下turtles-own [energy]
" `+ _: t' @$ [$ Sto setup3 R9 v$ Y' N) F" a" e
clear-all/ Z1 K, J4 u0 ]6 d) F5 c1 ~
setup-patches
/ _* [; i1 H1 q) J create-turtles 100; r+ W, X! I# i8 R
do-plots
5 i; ?9 C- n& I+ d) M. S ask turtles [ setxy random-xcor random-ycor ]
! r( g/ N% Z- ?& q) c- Fend
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move-turtles- t) O* g; X/ R# M
eat-grass, ]: j% h0 U8 i
reproduce
1 `8 Q5 i" C+ ~6 t! \ check-death
, h: k8 [% }& g2 \( b; y# I regrow-grass
( A) |" u7 w5 W# M3 \3 r do-plots
4 f3 I4 k2 V; F6 rend4 r, h+ [' D9 z" _; O
to move-turtles* ]! R% ?) K6 j
ask turtles [9 S8 u2 z* G7 [# f5 A
right random 360+ z: Z$ N/ P, G4 ~" F
forward 1
' k0 g+ y5 ^/ B. ~$ }* g set energy energy - 1
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end7 n) y! }( m$ a! Y- K1 ^
to setup-patches
( P f& B1 K! K7 K& }7 R3 Z& T ask patches [ set pcolor green ]; u5 g" p% i E4 N+ V$ v
end
0 R! R; A7 ^: \$ x) _& ^to setup-turtles
- d% Y n, @' k4 X7 S f0 w create-turtles 100
4 C3 Q I0 g8 o( p ask turtles [ setxy random-xcor random-ycor ]( w4 i6 l, |. {+ A; r6 g( g
end1 h5 T, d7 K8 z4 a% _ b! x
to eat-grass3 K1 m" y' f4 a( S
ask turtles [6 W2 f {: _4 X" j1 [2 |
if pcolor = green [: K# \9 C' b3 w3 {; u& |( R8 l* V
set pcolor black
7 u" ~3 K5 m3 K" N set energy (energy + 10)) {5 h5 t5 P: @: e
]
; [& D( T$ ]! u4 L$ A ifelse show-energy?
~0 z* N K# y0 w [ set label energy ]1 _% T: n( ~+ y0 `( B
[ set label "" ]$ L9 v% C+ I; R1 Q t. A' U) s
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end$ n! H. ~5 A9 ^
to reproduce( [8 d7 n! o5 q/ c3 y
ask turtles [
; H; |! G$ d8 |- Z0 R9 G8 p, X if energy > 50 [2 N* c2 W9 @# o N/ O9 a5 I8 Q2 K
set energy energy - 50 x3 J8 h/ g6 X6 W8 x2 \" V7 |" H
hatch 1 [ set energy 50 ]. ]1 _' k3 Y3 U+ s& L9 @
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end7 }( C( C7 @: M7 U% c' `+ t2 P" e
to check-death
4 ]* l Y: L% r" M' e ask turtles [5 ? v$ k4 @4 r2 v
if energy <= 0 [ die ]
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7 s3 k2 |" D, I2 V. d% M; z& @end+ V! C- b2 W/ y4 c5 `1 J
to regrow-grass
1 Q2 ?$ ^9 B# ?0 W; {: p% ~7 b ask patches [9 P: E. G9 w# \8 E. L
if random 100 < 3 [ set pcolor green ]
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8 n) @5 r+ B% c. d$ T" W! @+ y' [: cend0 X/ y$ V1 u( ?3 h3 ~) N1 @3 Y
to do-plots
8 P6 j5 j, Z' o6 @& } set-current-plot "Totals"
' I1 I9 n6 r7 C set-current-plot-pen "turtles"
2 z; v' T! t3 s4 n' P5 { plot count turtles$ V( S+ o1 ^5 m: s4 i0 u/ y# F8 v
set-current-plot-pen "grass"
8 {% W4 S: ~& W, m& Y8 u$ @# X9 |; O) s plot count patches with [pcolor = green]( B# n. `1 `$ Y& c; d
end
% ], D, k- x! d: ^可是运行时提示no such plot: "Totals"
9 ]7 W4 h. r- h& h' w6 }5 jerror while observer running SET-CURRENT-PLOT
- |0 m% l& x& N' e0 L6 T5 c) R called by procedure DO-PLOTS
b+ |9 ^9 L7 j5 I8 E% z called by procedure SETUP$ [9 {7 l" |0 A+ }% V/ L1 n% a5 b+ N
called by 按钮 'setup'
; w% s" ?0 G3 V& T求大神解答啊 |