我编的程序如下turtles-own [energy]# n6 g2 k& Y1 d5 F, i' K" ?
to setup
2 K$ d Y% H( M4 b6 F clear-all
: N7 B) j7 C5 I& x setup-patches. F! y2 k2 M; T% y+ o$ E
create-turtles 100
$ H @& a: l2 ^. L& y% s do-plots& c) B' r% p: t+ e3 i. o
ask turtles [ setxy random-xcor random-ycor ]
) \. v2 D. y+ p% Z/ Lend
) U4 u. N, g/ C5 Lto go& E' I2 J3 u) k( }$ r: d; z
move-turtles$ ]7 l+ T w% A2 _
eat-grass
& e) c u, S9 l6 q, U: | reproduce$ {% K2 X; U0 `+ {, J6 L
check-death
8 V, q1 o5 o: Y, d regrow-grass5 n/ Z3 x3 r7 F) p6 j- |
do-plots
. E8 B' o4 C. E$ T5 `& ?end
2 b! |6 x0 }3 r4 ~- C) wto move-turtles3 | S5 |; U6 Y5 Q
ask turtles [1 i& k" _* E: U5 }4 T$ o# {0 v
right random 360! a5 Z. x C) g6 Q8 |& E
forward 1
3 ^$ \; V. C* f f8 r! G set energy energy - 1
: R+ [# l/ U2 L* x ]( K8 D4 p+ I5 ] V
end
" q3 y+ w3 {1 s5 O3 @ q8 kto setup-patches0 ~( ^; J. y5 e Y& G% g9 X- T
ask patches [ set pcolor green ]
- a+ R$ I* t; S/ y; Pend: i2 U @1 h! _( e! S
to setup-turtles
. e1 P) S* ~( H: e0 J* E/ p/ \9 c; m create-turtles 100% H; g# d. S, c6 a3 c
ask turtles [ setxy random-xcor random-ycor ]
/ z6 D0 a9 r/ ?; N$ P7 m5 v" Lend3 L/ Q) P2 @2 ^& n6 T7 W6 X& j7 d
to eat-grass
+ @5 d6 C, i$ b. v6 t7 w( } ask turtles [
; w! z7 u7 d4 O( s# Q2 [ if pcolor = green [
# P/ d% }0 I6 Y4 i+ O- E set pcolor black- V6 p. Y# q i
set energy (energy + 10)
' {4 D8 A8 b% [. Z ]/ n; O4 R$ [$ I
ifelse show-energy?
0 Y! V! X" [; [4 g [ set label energy ]6 I( ^8 T" a% }/ E0 C6 o) _
[ set label "" ]
) k6 ~1 {# _1 @) q+ J, {4 _ ]
6 f$ I6 T* _* Y9 s. }1 m1 Zend8 o, q$ y$ M8 w9 h0 g5 b4 Z
to reproduce
5 v9 ]8 i8 V% J4 Y0 v0 A ask turtles [4 O r* \, t' x/ q
if energy > 50 [
. B" N2 Y: y: l/ i/ [; K) @) d4 } set energy energy - 50
9 B w' F/ T, a, V1 \5 P ` hatch 1 [ set energy 50 ]
, \) N0 }) l' S; N9 R( x! X ]
3 r" a8 k0 a8 O0 l8 B X' f! | m ]
2 q: A9 \; d9 b3 nend X3 s7 h m( ?" G2 q
to check-death( z9 ~4 }1 @; M2 b! o# C9 S
ask turtles [
0 `8 X0 @& u2 f* Q) v3 g) m0 B if energy <= 0 [ die ]7 V; O; F+ C7 O9 e1 M+ F
]) |0 e' _8 y. s f5 w) H
end z$ I4 b" I2 |0 e8 e; S1 e
to regrow-grass5 R/ l B1 ]; Q) ?( [
ask patches [" X) \( K8 u2 ^. G8 E1 o. e& K
if random 100 < 3 [ set pcolor green ]4 }! Y2 j- w; }( y' H# O
]5 \9 d' Z- c1 l6 h' g+ h8 l/ x
end/ D; c! ^" f4 e A0 Y6 E- m) L9 q
to do-plots
" _2 Y6 w0 X* W9 s set-current-plot "Totals"
$ C1 \, {$ d/ H5 f+ t set-current-plot-pen "turtles"+ \2 m4 `, P% y
plot count turtles
; U, z" `. u4 N8 m set-current-plot-pen "grass"4 r y0 [2 ^% f( E4 w3 T
plot count patches with [pcolor = green]6 Y: o6 j4 T9 L$ v9 w% v
end8 B8 }; i6 p y' @: {
可是运行时提示no such plot: "Totals"+ W9 ]. S) t' n! g# w
error while observer running SET-CURRENT-PLOT
w, C# b" Z6 ^, t$ U called by procedure DO-PLOTS
3 _, M m+ j' x0 M% B3 e& m( ] called by procedure SETUP
% q2 p( R, b9 V3 [3 `% k% O2 P called by 按钮 'setup'/ i; j3 U+ R9 S- g4 N" F
求大神解答啊 |