我编的程序如下turtles-own [energy]
) t6 c5 k4 E+ d0 r3 z7 W" M- k: e- ~; Wto setup
% s$ _/ ]9 N* X clear-all0 f! z" J, A& g* U4 L+ S) p
setup-patches
) L3 E4 Z( {& n7 |. G2 O7 L create-turtles 100
4 ?# e9 w, ]! m( B$ I; ]& k7 U! V8 a do-plots4 r% c3 k5 S. I+ Z0 q
ask turtles [ setxy random-xcor random-ycor ]; @6 Y F, j# ]
end2 g2 E7 ^ B+ g* r; F1 i2 N/ s* l
to go2 _) J; X( s% e4 w" C' K' C. y. x
move-turtles. k" D0 ?& ]; B. e' b/ M. \3 L
eat-grass
/ ^9 j3 l( m* y* u" P! V reproduce
5 J6 ]# J$ B! s. C) h check-death
& u1 \! u* m! `! O9 p regrow-grass0 i- \# {& w& U7 r1 C
do-plots. \% S+ F; c. {
end
7 ]- `2 ~) I6 @5 c8 |to move-turtles* }! V4 g- R, D# N$ |' H
ask turtles [3 a, X# v( h9 K+ V
right random 360- W1 p; D0 O6 N. t; d
forward 1
# C9 r, D' ^" g3 K set energy energy - 1* i4 Y& p' N, N. i% S; f* G! G) _
]
# u5 O+ Y$ c8 m/ {& L7 M. Y# xend
( n) R* j: A6 ]3 ?to setup-patches
J& u" V) U- Z4 w. m ask patches [ set pcolor green ]
( D- t( g+ e# V4 ?end
5 ]8 u0 f7 ~/ O$ xto setup-turtles0 V0 ?2 Q( ^& ^! D2 c+ B
create-turtles 100+ [0 C8 z. a1 K1 s! f
ask turtles [ setxy random-xcor random-ycor ] ?, p- D- _ c8 V0 ^
end! Y8 u5 g2 S6 n2 \1 w( W& v
to eat-grass
( d2 [2 Q4 }3 o ask turtles [/ S+ H/ C5 j4 i
if pcolor = green [
6 b& o3 Z$ \' g, P# c$ _0 F set pcolor black
* Z0 J. @" \- g. j3 K set energy (energy + 10)
( y6 z8 d3 R: f! Z, M ]1 R, l0 q4 C* r% g
ifelse show-energy?* `/ t5 s2 U3 G5 J/ }0 E0 a
[ set label energy ]" H; H0 H* }, @
[ set label "" ]
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end
( L" x2 g3 a: _" O8 Zto reproduce
. m' F2 |. u" s. _& \5 M4 D6 N ask turtles [# b7 ~! @5 x* n# j6 b' G% E
if energy > 50 [+ k: ]- S; r" V
set energy energy - 50( [& v4 G% m, W& R' y4 m$ Y: d
hatch 1 [ set energy 50 ]2 L* `2 r4 Z. A0 D9 N0 Y, C
]9 J) c; ~( ~5 D; ^+ Q9 c- l. {1 c
]
" Y/ S+ r& Q4 _( z3 R" R( Bend
6 Z3 {( R( R) N9 b0 w* v! vto check-death
. T8 D6 ]7 c( L3 [) M ask turtles [
! M! v9 o# t. s& ? if energy <= 0 [ die ]1 L F K+ K/ N8 i; k& ^
]
9 R0 b0 L5 s+ `end
- G, b; o' U$ t f6 Qto regrow-grass
8 |6 \0 ^2 I( E' v' ]" H, X ask patches [; w# B! _+ w: q0 o4 a: a, K
if random 100 < 3 [ set pcolor green ]3 ~; s+ T3 c9 W0 o' j
]' G2 ]' q- y: ^5 q
end
' i6 I) P' y( ?9 D5 x" Dto do-plots
2 {! Z W1 P' _7 f! V0 E1 `8 X set-current-plot "Totals"" @' t& t' S9 a, H. J' N( Q
set-current-plot-pen "turtles"
$ d* F. A! l! P* `9 N plot count turtles& g/ W* d2 Z0 L1 G9 ~
set-current-plot-pen "grass"; Y2 x, o* p; @' I; i3 C
plot count patches with [pcolor = green]
9 W: v( R4 O2 Hend3 J* ^3 {, J& ?5 U
可是运行时提示no such plot: "Totals"0 h: _: J' g$ y$ n- t( c
error while observer running SET-CURRENT-PLOT
7 s/ |* |( S- ~/ \2 S' }* G/ a called by procedure DO-PLOTS
" b" t. d* Y1 d% {" m0 Z# W4 a& ? called by procedure SETUP4 a* a H. } a9 G/ ~' z J
called by 按钮 'setup') ~" L3 R) t; C
求大神解答啊 |