我编的程序如下turtles-own [energy]- n( L& J( [# D. ^# C$ A7 [
to setup
8 b" |3 i+ F0 C1 B" Y' u- R; y4 n) E clear-all
% v- j. r( u$ T setup-patches% b3 Z/ ^& [$ X+ }8 N0 }4 }7 z$ d
create-turtles 100- H' b2 T7 O0 i) D, P" S. b) I/ F' }% d
do-plots( @2 g! y0 \0 u9 n* Z' X
ask turtles [ setxy random-xcor random-ycor ]
6 a8 g* N. i( s8 s$ z3 K# I i% ?end
( k) \6 u" [; c+ M' N. v; U* Vto go
' M: s) k n5 v$ q* G6 C move-turtles
' P$ z' D7 x/ Q& i eat-grass
; o- @4 M+ ~ z% C$ z2 q reproduce" S0 P( l" ?- l2 N6 q W( v! k6 r
check-death" O9 V% U5 B6 ^% h4 K6 B* V0 {
regrow-grass
+ @) Q$ O0 o3 d' O" E8 z- _6 X8 U do-plots
! Z4 l+ U- X+ C: J4 }end @2 @* r+ \/ k) G- H
to move-turtles
( Y0 \: @7 _3 h4 d5 O" z5 O/ H ask turtles [
3 T* q$ `% I. P right random 360, q }1 R: p6 ~# T( E) {
forward 1$ J4 r- H7 O+ e$ s6 X" K% K
set energy energy - 1: R7 m* d+ \+ ]. Q) D% X# h1 v
]- J' ~( W1 p0 N# d b
end
8 v6 _& L" T, F6 v* b; E7 Sto setup-patches
( G% k- e9 n% h' O- y: I! I' v ask patches [ set pcolor green ]
7 } s- D. M$ x9 e. G2 Oend" x. w0 l: n5 e# d! A6 @
to setup-turtles
. b ]2 x' f- N6 W! C- N create-turtles 1003 d5 l& N2 X& B% z: G4 L. c
ask turtles [ setxy random-xcor random-ycor ]
& a; R% S& I9 [" U8 V5 cend
8 X5 G2 O& u% h. k- Ato eat-grass* p5 A& w8 O6 @9 c6 @3 v) b
ask turtles [( \5 P4 i! z0 {% a/ @
if pcolor = green [8 K1 D* I; H) s0 X' E2 v+ [
set pcolor black e+ [5 ?- C9 a6 ]; v$ s9 Q
set energy (energy + 10)
$ \; J4 d* {- M ]
3 d @0 n- Q g/ `% d' M7 D# d( y: o ifelse show-energy?& U. ~) N( M0 z( d3 W7 q$ } ?
[ set label energy ]
& L" |! F4 L. F) } [ set label "" ]2 V% l6 [- _/ G. r6 B- c+ S
]8 b# X- U% ~9 ?5 p* Z) H4 t
end! [# o8 s2 d6 W! u, y: R! B
to reproduce5 w; a2 |4 e) N- c9 B+ n% U+ S4 k
ask turtles [5 R/ A C3 p+ ^5 \
if energy > 50 [
5 i: z# s8 H$ {7 w set energy energy - 50/ ^9 B5 Y# m- D8 C3 L
hatch 1 [ set energy 50 ]! [9 d" |( f6 k f" a7 M! ~
]' z2 y& A. ]2 J8 s/ I2 F! z/ l
]
6 d: w1 G/ p# k; Dend
* `/ q, P) c4 yto check-death
: k2 R: z, P7 d w0 a5 {3 \ ask turtles [5 l% @! z2 c( r1 J
if energy <= 0 [ die ]
2 F9 `0 R0 i# t1 I- X& K1 j( R ]% b8 |" O$ @: n }% w: R/ q
end
{5 s% s4 q* j4 k0 _" j9 u" jto regrow-grass
9 v. i9 Q4 Y" \# y$ j ask patches [
9 n0 @: K4 d6 L V" } if random 100 < 3 [ set pcolor green ]
3 T* p1 b% g1 q3 H) T3 D( J& i ]
* I1 F$ F, t1 Q1 I# [0 D' {5 J8 kend6 _; h% _# g9 f5 ~% g% _6 c, [
to do-plots
7 |3 Z+ v4 h/ z set-current-plot "Totals"( [4 F; p: L: g1 y$ u8 t8 z" E( s
set-current-plot-pen "turtles"; D3 e: I& S1 E0 V. M# @
plot count turtles) e$ B p& c3 Y" M! x
set-current-plot-pen "grass"( T. A/ ]: k! U/ s; x6 R
plot count patches with [pcolor = green]
( p5 b/ y* Y6 G, C( t7 Cend: l4 Y9 P+ \1 ~& n% G2 r4 F8 x/ ~
可是运行时提示no such plot: "Totals"
4 e; d% |- ?+ X9 n Cerror while observer running SET-CURRENT-PLOT
! U% F: z' } z# {! o; f called by procedure DO-PLOTS
$ J9 s& n' ]/ O called by procedure SETUP$ t' N& B& N/ Y: y: z
called by 按钮 'setup'& y4 P2 D; T! W% p! t! E
求大神解答啊 |