我编的程序如下turtles-own [energy]: a r' E K- u, R8 ?4 L) L @
to setup
7 m2 t+ z$ l9 o& E, ?& u6 M clear-all$ M6 ^: \* {* b# d$ s1 e v4 h
setup-patches, n4 @5 y: l; n# j
create-turtles 100
; j# b k) B+ I9 m% ]3 S( r5 u do-plots
2 h/ D, N1 x: | ask turtles [ setxy random-xcor random-ycor ]
" Q0 }5 j$ R! Y& \$ T) D/ K; Aend* Z! a5 u; M* G* Q% M: [9 Z# j
to go
% `2 M1 i4 h+ s: A! \% [) \ move-turtles
# f: O: Z* O0 K, V( I8 V& K. v! p5 { eat-grass. v! \+ c6 {1 o( z( }, b
reproduce( Z/ s( ?" Q8 n3 {: E
check-death
* }2 b: ]9 F3 u# i% V, S regrow-grass
4 C+ A5 I3 J/ G, G, g do-plots P4 p' M) K1 F( z% @- `% R
end: _0 J8 l8 X2 |+ l* l5 b
to move-turtles
: T- R$ `" M/ A3 X) H ask turtles [
4 H" G8 i9 z; ?+ g. h4 Y( G7 y right random 360& B: C4 ^) x) K3 F c8 w g
forward 1! k* H; h) y3 T4 h. A9 l! e
set energy energy - 1
2 @4 v5 b2 N0 }) U; Z5 d. u8 ] ]8 X2 J/ j/ N* s! |
end
& H& a( `& M: l/ gto setup-patches% S9 z( @4 Y o2 _
ask patches [ set pcolor green ]
. d. i0 i4 E, y' `0 D1 [0 R+ @end6 q3 _2 |$ W# U# p" i U7 M1 y
to setup-turtles
: b q2 w( ~ B9 z& w create-turtles 100, I/ }8 A: w: }1 ~- u
ask turtles [ setxy random-xcor random-ycor ]
, [9 F' B9 A/ A; ^' rend
0 `1 k" J3 A9 t0 x3 i7 Nto eat-grass+ N) D* x7 g6 {7 ^+ x1 |
ask turtles [
% g2 P) Q& k9 F if pcolor = green [2 D# ~" N* o/ r; l) ` v
set pcolor black
+ m& l. b/ j9 C8 e set energy (energy + 10)
; j. P1 g6 `" J ]9 S4 U$ i/ S6 p; S
ifelse show-energy?4 M7 q: F" _4 z" y8 ?8 i. T
[ set label energy ]
. a! u. P$ d- f. u4 i# g. V [ set label "" ]; T2 A0 j( K( s- C4 U
]/ y- U5 ?( W; P* y
end
0 [) ?: g; |# b$ Jto reproduce& G7 M5 V* b0 v5 y, W
ask turtles [
; p+ {$ ~+ U& M1 Y' n. Q% \ if energy > 50 [
) |. p. X- E2 t/ h& \ set energy energy - 50
9 w. N2 U5 g6 G* ?2 g- ^, | hatch 1 [ set energy 50 ]0 R+ x7 I1 ^% [: U' T. t' \& R
]' r0 v5 p& n! _
], \4 A% i2 Q/ F
end
8 ]( o, }' d2 i" G! h6 Z; h. Uto check-death& z8 n9 d2 X" M/ D
ask turtles [% c- q8 K' m% [; e9 S5 @
if energy <= 0 [ die ]8 B% |' d }6 G& D* z& j3 J
]- a0 x3 Y* L8 }; ~
end3 ]1 a7 F, Y0 o- }. a j$ v# s
to regrow-grass
' ^( b1 d/ O% o+ a4 A$ K& w$ @ ask patches [
1 ^0 w: {6 m; Z7 h if random 100 < 3 [ set pcolor green ]
' x' c# @* {" u6 ^) b$ u% T( x ]
3 k% _, N) D7 s- h7 U7 G. gend
: e* a& }6 F6 ?8 n( R! Ato do-plots. c, ]" K0 k! g
set-current-plot "Totals"" s- U7 q! _0 n% k' P
set-current-plot-pen "turtles"
6 z/ n& M1 N" p$ _! @ b6 ] plot count turtles
. y* f) m* x4 ]/ v3 h set-current-plot-pen "grass"1 |% x4 \% u* I5 w4 {4 q' a
plot count patches with [pcolor = green]. p! ~3 Y; K( ^( T! _
end/ D# d3 [$ z: ?$ Y
可是运行时提示no such plot: "Totals"$ ? Y" V! L) E; w
error while observer running SET-CURRENT-PLOT& o8 Z' x6 O& ^2 q
called by procedure DO-PLOTS
- p! A6 o+ M- H9 i: e4 ^& t6 A called by procedure SETUP! `. Q7 E# @( N1 c4 q. g: T8 i" V
called by 按钮 'setup'7 P- {- V* i- I3 D- _5 h7 K9 W
求大神解答啊 |