我编的程序如下turtles-own [energy]9 e; c. N8 L: N/ r
to setup1 }& U- v0 { ^) R2 Z
clear-all
5 _% U% u' W/ {; t setup-patches5 R; c' {' y# K1 }
create-turtles 100' ?, D( m- y) |+ K" {; n
do-plots7 q& I' v: t% W, S3 \+ \* R
ask turtles [ setxy random-xcor random-ycor ]9 Q1 y) `* @" C }' o9 D0 G9 G
end9 M/ T( `% g6 s: e
to go
( q% P3 m! I8 A move-turtles
) J2 Y8 i# N7 J eat-grass: K+ D% X: N& l
reproduce$ V K* a0 D4 F9 g+ N: {0 Z4 Z0 A5 g
check-death
2 \! m9 j; X6 x/ j( w regrow-grass* a; P( F7 b! w7 F m
do-plots+ h4 F8 {) y, N3 d4 Z2 e6 [8 _
end
9 X2 V. U4 ^& \+ v, Eto move-turtles
5 I6 K8 |8 X! z6 Y* |9 W ask turtles [
4 v% b# [6 c; ]$ W, K5 A right random 360
- j O; X, |& ]( K forward 1
8 F. y& O& A9 z- G3 I9 K set energy energy - 1
& f" k# P1 y: h, h8 Q2 g ]( ]' t( u% X& @
end
: L# ^( `" N( mto setup-patches" O: g' ?) k1 \% [
ask patches [ set pcolor green ]' O, d% m( F6 t/ e; {7 H+ H0 w
end
" L0 y& X/ C( S3 g9 f$ V, Pto setup-turtles
. T) q7 G# M4 r create-turtles 100* t* s1 ^3 h$ H, h$ w
ask turtles [ setxy random-xcor random-ycor ]8 `$ W+ q- ]+ y/ C0 E
end# _1 P9 _- j) \& \2 y% { n; i3 V
to eat-grass5 S9 L" k; B5 y! a& B
ask turtles [; ^ a; a4 g( e- g( o9 t+ M
if pcolor = green [
C# e; s/ j5 O0 q set pcolor black, X0 q6 A4 f0 D* {. N9 X2 G
set energy (energy + 10)5 e* C9 \1 v$ Z" L: ]& M m" ]1 E/ Q
]0 B& T$ P. A/ T3 q) w& `; H
ifelse show-energy?
" U1 m( C3 k( k2 i- V Y% U [ set label energy ]2 P3 G1 D) X# l$ q& ~% L) f/ K0 h
[ set label "" ]# ^% R" N6 n Q/ O
]
+ i k1 p: j; u# G2 D) N5 \end4 d1 r9 G; G: W
to reproduce
, B9 y: S5 v# a2 @! y ask turtles [
$ e2 g* F8 @4 e& J. d if energy > 50 [
" b/ b6 n. u6 {" K+ g; P set energy energy - 507 j& x3 |) Y+ ]' b8 L( r* u( P
hatch 1 [ set energy 50 ]2 n% t0 p: b; `
]& h8 p r1 q1 C" V; B2 ?2 N- i* M# E
]
/ e) \6 s! X( b# Nend; _: {$ x+ f: @1 C& f: q
to check-death
+ S3 s" S$ z3 ~4 L$ {9 l* C ask turtles [: |# i0 E1 ^8 o+ u6 V
if energy <= 0 [ die ]9 F3 w. _4 y7 I' n
]8 k# C9 B& `- Q# F
end
) m1 v% t, L6 y' g7 |# u, Pto regrow-grass
1 M) Y/ D8 }$ u" b+ Z" K ask patches [( ?1 B/ X' _$ C7 `3 [) ?
if random 100 < 3 [ set pcolor green ]
7 N. i6 l, k! H( s0 j8 i ]
- e+ m& C9 Z" i) l+ n( |; ^" f7 Kend* ]/ s' W# x' ~' j0 E
to do-plots0 N: S' _1 E* J0 B2 z8 u( z
set-current-plot "Totals") w( B/ G1 c: ]
set-current-plot-pen "turtles"
0 m! h* j0 @" ~8 n/ s plot count turtles
3 C+ n T! s2 H/ ?" i( w: D3 b set-current-plot-pen "grass"
% z/ [7 Q6 _7 b9 F. \ plot count patches with [pcolor = green]
/ u; k- A6 d1 _9 j( Iend7 y. X; j( U% z# F* [
可是运行时提示no such plot: "Totals"2 V4 y; q) L) Q+ A: a( D0 g
error while observer running SET-CURRENT-PLOT9 m' V% `8 ?( ?6 V8 u9 W8 P. n% I* {
called by procedure DO-PLOTS
/ {. K) G9 ^1 G0 N called by procedure SETUP
9 z) j3 q: u% D+ L: Q called by 按钮 'setup'
" X. h- p: S$ M3 W2 |* K5 N! `求大神解答啊 |