我编的程序如下turtles-own [energy]- G( v2 c, }% m: ^6 e* [4 n
to setup
4 B/ Q3 n( w! Q6 z7 }" F) L clear-all7 I4 v5 m; K6 j3 J
setup-patches
( _! l; Y, P4 X0 }7 D create-turtles 100
; {8 C$ V' X( |# D do-plots+ y" g1 Q( [0 v" H; {
ask turtles [ setxy random-xcor random-ycor ]
# Q. x& ] K! \1 Yend
n& \# _9 K* Nto go- x' O4 b' F* k/ [ q; ^9 n& a' @* u
move-turtles
l5 H# K. Z: _0 e0 d1 s eat-grass
, H- K3 X) _- w: Q6 E( k( k, ` reproduce% n! J( j! g# p5 Y6 n
check-death) V" `6 U. H( }
regrow-grass6 p4 M$ _. x6 m S3 `/ n; c
do-plots
; D& y `" k0 b: J' u. ` Cend* A, U2 G, f% }
to move-turtles
. Z+ P, t/ o- C ask turtles [
+ `. N: B' ~2 \" K9 a! r0 n2 I+ r right random 360' Y0 @2 o6 z5 ^3 T+ D
forward 1 c% b: z+ W U; j
set energy energy - 1
- r4 e9 n: a( P" u1 U* P. X0 X" ^ ]) ^: W+ X$ W, R, U+ |# s) E. S
end7 t7 e# z7 `& {5 s, y4 m+ \$ _
to setup-patches
; r( g/ D& U8 u3 T a( h. E ask patches [ set pcolor green ]
9 l# x3 ?; h2 d' _end
( T1 v" m. C! D) _5 k! Bto setup-turtles$ f6 u- X- g( h) C: ~' e, i! Z
create-turtles 100# E; Q, {$ `* ^3 |
ask turtles [ setxy random-xcor random-ycor ]; p7 q$ e+ ]& y. M
end
3 Z; a6 |% l( ?$ I5 I8 A0 }/ Kto eat-grass6 i( \* s' t! W
ask turtles [% g6 G8 ^! E, m$ o
if pcolor = green [
, J6 {* R9 U5 @# Q3 G set pcolor black; N. u" ^/ k/ F9 M6 s
set energy (energy + 10)
9 B4 n4 c6 o" w' n& I ]
% x4 a# o' o6 k& a9 c5 f+ e ifelse show-energy?% t4 U3 r* S" ~" u3 @: f
[ set label energy ]- f9 N) K" c- V- Q7 a& X7 }
[ set label "" ]+ t, d3 q& Q# |% }- C
]
& c; h. l& Z1 i% O+ f2 _end$ c3 @% [' [ ~9 T8 H
to reproduce
/ @, W4 j/ P! l5 W1 P ask turtles [4 M+ v/ \7 y3 _4 P- q: O$ U& M
if energy > 50 [
$ @$ {% \' ?$ @3 G ?9 x set energy energy - 505 E" R; t+ `6 R' d- l
hatch 1 [ set energy 50 ]
: z0 ]! V3 o8 g4 ~4 v( l3 a& Y8 Q ]3 B# g) Q3 N# m8 ?. ` `
]$ ~; g0 e8 w% `/ S# {; v$ |( f
end
* C4 x+ y- v+ c7 k5 A/ Jto check-death! J" o2 ^) N! \ w- j$ l
ask turtles [
9 e$ |- A0 \3 K3 G( q if energy <= 0 [ die ]
" x+ z& D6 c. t8 s$ A6 u& y ]
4 T( F6 B/ ]7 nend
0 I: m- K9 z( `) B q- l) \to regrow-grass: F7 r, n1 r" G" Y' g2 d2 i8 `( ~
ask patches [# @- v; ^. B$ Q' `, l4 ~9 C
if random 100 < 3 [ set pcolor green ]" N7 Q7 {3 b6 a5 f. k
]3 k% Q# ~5 ~6 n, }
end
4 E: E* l- T K+ z8 W2 E, a) _to do-plots
9 O f k+ s7 c6 v set-current-plot "Totals"& n6 {5 j; h4 J# j; l
set-current-plot-pen "turtles" U. f; y9 m! V4 }2 ` b1 B
plot count turtles8 r* u! u# P" i( p
set-current-plot-pen "grass"
4 s0 {! Y9 O- ^& I plot count patches with [pcolor = green]2 x% a) X Y1 m6 v5 W4 Y
end
Z2 _2 V0 M& ~4 G- `可是运行时提示no such plot: "Totals"
% h6 |9 T% N8 V$ g7 d( [1 yerror while observer running SET-CURRENT-PLOT
! u- {; q/ D2 _, K: ?6 [4 p* | called by procedure DO-PLOTS
t. ~5 `' m& G! F! ^! D+ I called by procedure SETUP# `7 R4 ^6 Y5 {' b$ p _+ h
called by 按钮 'setup'* s+ v+ h$ `8 H9 J( C
求大神解答啊 |