我编的程序如下turtles-own [energy]& l% c4 j1 t$ G, U9 z3 N" w; L, A
to setup
- }1 h, p* Y- ~3 P- s clear-all: P2 d+ p: j4 S! S
setup-patches* H2 g0 R1 y+ w, |5 u
create-turtles 100
$ V! K$ E6 O; l- [- x5 f/ _ do-plots X, A9 \2 _& Y! O' b7 u
ask turtles [ setxy random-xcor random-ycor ]2 @: A& K$ x) F7 {. i' }
end; n9 m( h( A3 Y
to go
! p+ Z; l, v; Q8 G j) F X8 ] move-turtles! i3 q3 d7 }$ R/ v' Q& [
eat-grass
7 B+ v2 t8 t$ F1 W1 i reproduce* E; ^( p8 H, t9 q% `1 d' y, ?
check-death
3 @8 m# H; H2 F, L8 @+ |7 N9 o) e regrow-grass; S4 _+ X8 P' t' C' x
do-plots
% }/ e% N$ g( l/ T5 \+ p y$ O+ q; g. bend) c+ T% O: [! M# k; e& X0 `
to move-turtles
- A9 b2 p$ }8 f9 s4 _, P- k ask turtles [
2 W6 }3 T/ L3 ` right random 3602 [3 S. h r* q' [
forward 1
* v( } {$ u: W9 Z' s/ Q" v3 g set energy energy - 1; Y# X8 C, X; E3 D; e
]# V" i. t& B' e k/ Y( h$ f A
end/ o$ h( j% k- b0 j* t4 [1 r
to setup-patches
, I' {, E' K, N ask patches [ set pcolor green ]6 Q$ F$ Q+ V' z) J0 \
end! @0 \3 ~. k% A v
to setup-turtles
( o( u9 W1 D$ w: M: v5 L2 l create-turtles 100" X! N u$ F* d) s' z3 Y6 v* t
ask turtles [ setxy random-xcor random-ycor ]
. [# L7 b! x* o: g5 Vend
( m, v5 E) N+ ^2 v$ M9 Jto eat-grass
& t6 v# Q- V# D' ]/ o1 w ask turtles [
" P9 t! z; P/ s" h+ F if pcolor = green [' x0 F& G, m$ Y6 n+ Z' a' o. Q
set pcolor black
1 l8 l0 W7 x+ o set energy (energy + 10)
" c m" V8 k' ^4 f7 [ ]& s5 a) B: [4 e0 q
ifelse show-energy?
3 j: Q; x! a) u6 h: n& g [ set label energy ]# x# M2 P- v* D! C
[ set label "" ]6 W _6 M" {. t8 }$ b
]5 {% I. K; S$ m$ h
end3 z0 f* F2 t7 N3 ~: T2 m% |
to reproduce
5 j5 C" ~; Y. R- y$ ^8 A ask turtles [! v+ ? z8 D9 ~8 Z+ M
if energy > 50 [9 J$ x/ L2 h' V8 ]1 ~; a
set energy energy - 50! s* n4 `3 @9 j! c* R& P' V6 k x
hatch 1 [ set energy 50 ]# ]# \# y; ~1 c. Y# I6 V; I
]6 h2 H6 @; k* U/ @5 m
]
% c; A4 T1 O* }. j8 S! nend) e B8 [& F; V: K
to check-death
5 l- P# v7 t9 b! ?/ \1 n, `/ E ask turtles [5 K* j" n) V8 n# _8 f
if energy <= 0 [ die ]
0 \% a/ `# I: K+ U ]
+ w' r6 o* g2 `8 }+ t i3 r9 zend- l: B# l* s5 V( e4 U/ t
to regrow-grass
2 C2 D1 b- a" ^5 l; ?) ?3 m ask patches [
4 O& i3 m, N7 s \! ?* B9 E if random 100 < 3 [ set pcolor green ]
' y1 Q/ V W# h; j/ ~" | ]1 `4 A9 h& M n
end0 G! v- f7 ]% e" j- K" k7 J
to do-plots
& w1 b. w9 \3 j% e set-current-plot "Totals"7 ~8 F S9 \9 n
set-current-plot-pen "turtles"8 A+ o/ K- [( `/ ]/ ^
plot count turtles, |+ D! ]) e! ^* }2 a, X0 T; w
set-current-plot-pen "grass"0 q# Y% x7 E( j. D
plot count patches with [pcolor = green]: M) x9 y# c: @& i; r8 |: O; J
end6 z5 S7 U( y. f# S9 ]
可是运行时提示no such plot: "Totals"
j Y# [4 R9 J6 y2 Y ^error while observer running SET-CURRENT-PLOT
) O5 l" a2 q& z. K( G" D called by procedure DO-PLOTS4 f/ @, l" A/ _4 K, e4 m6 V" G
called by procedure SETUP5 d& b5 x" y& A) M. _8 ~" M: v
called by 按钮 'setup'
6 D+ ?' x, a2 `; ] S求大神解答啊 |