我编的程序如下turtles-own [energy]
R" _' z0 u9 ?" {+ N. W5 nto setup
5 _) W" D! ~: T1 R! F clear-all2 M( X3 Q% z: ]+ J7 v
setup-patches
8 y/ p( ^+ h# R; n9 h' b create-turtles 100
; X v5 s }# J+ {" o0 ` do-plots+ D: Y0 |1 D# m, W) i( {0 e9 \7 g3 i
ask turtles [ setxy random-xcor random-ycor ]% R1 A j: u, W
end: r& @- ^% u2 p4 C- L
to go) ]# E- W- a; r' v8 {
move-turtles; C6 X2 z2 g# P) d- Z1 R+ D
eat-grass
- d {" S, b( p; r4 G% d reproduce
6 Y; c' v8 F7 r( @/ K8 u check-death
2 ^! j7 T1 m& f% W4 I regrow-grass
& B0 Y/ j( e# U3 ~+ e' M do-plots
/ G8 p, k+ B% ]/ J* D3 ]) v* Yend1 y+ z. d; J6 l3 J/ ]# O
to move-turtles0 [5 l3 f# N% F7 v
ask turtles [: z. l% [! {! S# P1 O) G- p( a
right random 360
7 |# j+ z% }- {3 |3 R forward 1% ^! l- w+ r. R* B* v9 h
set energy energy - 1$ w& N' ]" L3 G8 A3 V8 I
]
9 k4 c' r$ A- Zend
' r \0 {: h, n( gto setup-patches
! k- e7 t; y& G% ~) C ask patches [ set pcolor green ]
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to setup-turtles c4 j, s4 [3 e! o, h% x0 {
create-turtles 100
Y0 w( m& `1 q* T/ D ask turtles [ setxy random-xcor random-ycor ]
1 o+ a4 c* m& Y& N. qend
1 N/ { J$ Q: ~4 hto eat-grass. t/ |2 B" V3 v7 h
ask turtles [
! ~0 c( n" T. b+ W* h0 s* d if pcolor = green [$ F: R+ D1 |; ~: u w
set pcolor black& F/ l. \2 v, t' ?5 a+ z; G* a" o" E
set energy (energy + 10)
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+ B( l: l* T) @; H( L( o ifelse show-energy?' t5 r3 j8 V3 Z: C6 \
[ set label energy ]% G% R% {$ R' ^4 H. w0 q8 d
[ set label "" ]
# q1 V9 Y. y) x0 I, z2 X ]
, P0 R1 Z/ g7 h V! Q oend
! n: g( D5 \! R% u0 Kto reproduce
: B9 v# Z2 Y" P: o/ \# t ask turtles [
5 Y; h. |' v' |, |% y if energy > 50 [
6 J% t+ k' m; i set energy energy - 50
/ i& r, Z# i* {! A7 {) b hatch 1 [ set energy 50 ]; q( Q2 C" F; J, q1 P
]# d; ` w. @1 l9 x! m! `
]
; I, D: r; H i; `4 t5 \1 xend
& l8 m% _5 Z# ~$ D! ~% A nto check-death
7 x8 G* q; k3 R0 U* m8 u. W0 v ask turtles [
9 B; q/ A8 D( v' ~ if energy <= 0 [ die ]
$ q- f4 ^6 n* Z ]
4 N0 h, a6 w( o; x; }end+ @1 l1 s/ X: T- x% B0 d d* T1 ?- s
to regrow-grass
' A% a* {; e) E7 C, L3 l; C ask patches [
! L8 z- W' h. Q% z" l if random 100 < 3 [ set pcolor green ]
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end
' Z# U+ Z+ r/ w; ^* N/ dto do-plots/ v; T: p7 A0 z. H$ G
set-current-plot "Totals"( I/ A! U! L( A
set-current-plot-pen "turtles"& Q. y0 V: | I" U# [: N
plot count turtles
+ ^! _+ c3 S. H' @; u4 H set-current-plot-pen "grass"" I8 v8 t5 r q, j8 B8 o/ E
plot count patches with [pcolor = green]
" v7 H0 ]& I$ _* N# Uend
4 r$ V! E6 @ V7 ~- |' d$ B+ M可是运行时提示no such plot: "Totals"3 A! r3 i& E* z
error while observer running SET-CURRENT-PLOT' C- ~0 C5 {1 c
called by procedure DO-PLOTS
# c2 O# b1 j5 j' N( a) y. a called by procedure SETUP1 G" }" Z9 e$ U( P
called by 按钮 'setup'- r6 b3 l) n0 ~7 m4 b4 `
求大神解答啊 |