我编的程序如下turtles-own [energy]
: _* L+ Y3 o$ O7 uto setup
' s! e, H* B1 Q+ O clear-all; Z' A1 W v" i* P7 I8 {
setup-patches
+ X; @( q$ |, a- p) B, Y create-turtles 100
& l% [8 o j- E7 A do-plots
' ?/ c& Q U% k2 o ask turtles [ setxy random-xcor random-ycor ]+ ~, q. D `" \/ }; S4 s, L7 j
end4 u _( P6 C$ n/ g& W) j: \- x, A
to go
! a- F2 F7 O! `( {8 U move-turtles: R& p% u' q( V8 h1 `7 H
eat-grass
! }; u; Q! H; C reproduce
3 @ ]) |" S' ]" ?; N0 Q check-death
% C3 c; Y4 T0 n, v7 [/ q0 ] regrow-grass' N6 n" {- L! q. f h% ]/ a
do-plots4 B+ E5 o* y5 ]* E* T
end
8 Z: d5 {8 ^ ^5 S$ ^9 v0 vto move-turtles
) T3 y6 ?3 V1 v( e" g ask turtles [
( f. d! t& R+ m& _ right random 3606 @* _1 ^, s! V9 N* o
forward 1
$ w$ \( m8 N0 y/ L) R set energy energy - 1
" ~" W( T" T: [ ]& A1 Y% P) m! g% f3 n
end( x* q8 I& f2 T% [% _' S
to setup-patches
8 q& g; S, k7 l) U- y) ?' T9 q0 c S ask patches [ set pcolor green ]: X% b; b) b# N# l3 x
end9 O9 l, g) y; s7 k0 p( [- { j
to setup-turtles# |) N6 f9 M0 ^$ L& v# H+ e
create-turtles 100
8 r& s7 R: `! k& v1 _8 e, R2 } ask turtles [ setxy random-xcor random-ycor ]1 r& X! b; O5 K' g
end
2 @0 @4 C3 S: d8 o$ Y7 K) @- Xto eat-grass
# G! p$ o1 ?! x5 z- K ask turtles [
# \& K, L2 c( {& {1 j if pcolor = green [
7 v0 W" U) j/ T set pcolor black
2 ~8 Y# W: l5 N, B( c) P set energy (energy + 10)& A7 j+ \; d# T! _: [: v
]% h/ Z/ D& u& U. u
ifelse show-energy?
+ }/ n* |9 Z1 h: ^6 h4 E1 l0 ^4 Q [ set label energy ]
8 c0 z1 ]# b/ s) W. w9 F [ set label "" ]
w& k5 e6 z/ x9 h* u3 h ]4 V% Q& d+ A) F) Z6 X
end. n4 \( g' d$ t( A. v
to reproduce$ w6 N' L8 D2 Z c# I
ask turtles [0 }2 q% z( _8 ^$ n
if energy > 50 [+ g: Y0 Q0 |) ]
set energy energy - 50
' u9 J+ B+ ^% k } hatch 1 [ set energy 50 ]7 _; r z1 x$ ?$ s7 m. ]
]
, K% f g+ @: U ]# V: Y4 j& D. f
end4 G6 q5 a5 Q8 n* c0 L3 {6 M. M
to check-death
' e6 I& c2 L2 o* z+ f8 m ` ask turtles [
% Z/ E5 x, G O6 M- n3 F+ l if energy <= 0 [ die ]$ f3 T! C1 q8 B0 e
]
7 ^* z" l% r2 }& k/ u8 [end0 i0 T* o, ~/ X9 i. c( A- K$ S
to regrow-grass
# n! l2 O7 e! l* I ask patches [+ c d% r1 ~* ^: f" G
if random 100 < 3 [ set pcolor green ]
3 z" b8 J/ r( R ]3 ~# F8 V6 Z2 Y9 P* A5 c3 \# g
end
3 r2 \+ w$ `8 Hto do-plots6 N9 B" q+ i h2 a' r( i- ?
set-current-plot "Totals"1 _/ t$ W5 N( P" V4 |) f( K3 J# q5 b
set-current-plot-pen "turtles", K% P' g# s: Y" ?& R6 o
plot count turtles
1 j3 L: L3 T+ ^ set-current-plot-pen "grass"
2 Y a) Q2 j6 B/ a% z plot count patches with [pcolor = green]
" `% y$ O h2 Mend4 i2 p: Q+ R: n5 S0 @
可是运行时提示no such plot: "Totals"9 m' [% H# I+ Z- u( ]
error while observer running SET-CURRENT-PLOT# f% v; ?7 k O& ]; H3 e Z
called by procedure DO-PLOTS
4 j, a' x: Q/ M4 K* ? called by procedure SETUP
7 y9 E- \2 @( F9 V called by 按钮 'setup' @4 _9 G2 x& Z) ^3 G# S% d+ X* y
求大神解答啊 |