我编的程序如下turtles-own [energy]
l/ b# ^: |$ q' ^0 Rto setup
; W7 X0 a! d' u5 K clear-all" X, W( K% J7 x
setup-patches g9 b! {8 c8 A+ p# `$ U `
create-turtles 100
- t4 ?/ O" {) j1 Y0 e do-plots
: i" ]; y* K& {; R# a j) U ask turtles [ setxy random-xcor random-ycor ]2 K% n5 y9 ~% o
end
8 V6 J8 c+ g {0 r5 E0 sto go1 _4 {- W; \" ~' [; X- {
move-turtles% V; k- `4 z; x& x8 o5 Z
eat-grass
( b0 m' [( D: s+ t5 ? reproduce, Z9 H2 @* E2 f: h
check-death0 z1 Y6 w3 ]( i7 s0 M6 F7 j1 e
regrow-grass% h/ C2 `9 c5 D H$ B: f
do-plots- t$ w9 V6 T! Z& e! N/ w3 c/ k/ E
end- _6 \, W; _) Q1 F" k& w
to move-turtles @: A2 u X r( k5 w
ask turtles [
& e1 t8 E2 g7 N* V$ e4 ?" K right random 360
. Y; _0 y2 O# Q+ J1 k3 L9 ^4 F forward 1% m6 f& x) p' I. A, g
set energy energy - 1& Z+ G% X( q# l. @' w: a
]/ D7 c7 Z6 E7 n! \) l
end
4 e3 u/ o0 J/ _# y3 Nto setup-patches) }/ u2 v2 d5 A9 h7 T8 c
ask patches [ set pcolor green ]0 @& m/ H- D4 i4 d% A
end
- q2 u6 J' r1 tto setup-turtles
2 R" I! } \0 o# M& d create-turtles 1004 t1 q9 n+ O4 o
ask turtles [ setxy random-xcor random-ycor ]
# O. z6 x5 G5 G* |+ i$ {end/ y: I8 \" O$ c3 _! e
to eat-grass! D6 M# x. g2 r/ T3 u
ask turtles [
8 g/ J' g4 V& C4 S: E if pcolor = green [
D' }0 p% o$ K# [+ `0 }: M set pcolor black
H3 l) @! o0 `8 j" s# `( c/ l8 m set energy (energy + 10)' d$ B- R( G, ^. k. R. L/ m
]
c/ V( o# ^: ?5 k* D ifelse show-energy?
& M& z- d, j* M [ set label energy ], J& V9 m; [: e* G, }
[ set label "" ]
% ^1 h/ K' E* s5 @/ {, P6 p ]* {1 {* n7 ?1 Y/ g$ ?
end' c/ ~1 u8 H% D8 Q% B! X% M) q9 @1 i
to reproduce
* ^ I& W6 x" Y: D2 Y1 m( @/ u* { ask turtles [9 J- {# {+ @( `1 j& b1 h8 j$ @
if energy > 50 [
$ g8 G$ l8 ]+ Z( j1 [: H set energy energy - 50/ Q7 w5 y, j9 ?$ k4 h
hatch 1 [ set energy 50 ]) B5 A& ?' a/ V. J
]
1 ^1 H/ q" U. {% D8 N4 z$ R ]$ e; u' E1 |3 R# Z7 i# W& j3 `. m
end
! p; q/ @2 a5 O2 Xto check-death$ g5 s% a1 F, u) v
ask turtles [
" N$ g( A4 g; g! ^1 g; ~ if energy <= 0 [ die ]
. l* t( P9 Y; o* J/ Y ]* F! C% X1 o0 p7 G% r' p
end
- I; C$ q4 I& i$ uto regrow-grass
$ G* `0 ^2 Q5 p7 w: j ask patches [
2 `( D1 |3 d3 ^! z" [! u if random 100 < 3 [ set pcolor green ]
3 [( P+ f% m8 L) r5 a" B ]4 T/ r) e" L7 x7 w
end) x. z8 Z" r# W ]% Q8 {
to do-plots$ r7 a- Y7 k1 w; V! D: k, U1 A
set-current-plot "Totals"
7 z9 S, x: n+ _9 v1 z set-current-plot-pen "turtles"
" w. z8 c% d# c, }% m! j1 V* f plot count turtles
2 S/ U1 W# I! X7 ?. J& E" H7 R# o set-current-plot-pen "grass"
; V) N. L& y7 r8 T8 S' E plot count patches with [pcolor = green]$ p' r6 b) A6 K5 k" X* F7 R K) K
end* e2 j. }$ U- f/ e8 @
可是运行时提示no such plot: "Totals"$ G. k1 q7 q( F/ w5 |4 s3 X2 ]
error while observer running SET-CURRENT-PLOT4 K2 G8 M( z! J# F7 d4 q
called by procedure DO-PLOTS
$ J8 F G' p8 @" R( T0 y called by procedure SETUP
) v; X+ }- g' u1 x9 O; k% o' C7 d8 k called by 按钮 'setup': J, ?4 W( R( N6 e7 o5 p7 G
求大神解答啊 |