我编的程序如下turtles-own [energy]
5 {6 J9 l$ Y, f! W& `6 Rto setup& V7 h; k" j/ F; q7 }) o& l d/ x
clear-all
. C. {2 F) H0 O- u" `( ] setup-patches
) x2 `0 j. D) o: P create-turtles 100) }/ r: R" M' E4 Q5 f9 k8 A! i' a
do-plots3 c$ B* h$ W: ]
ask turtles [ setxy random-xcor random-ycor ]* B% }# I) o. w; C1 u. I
end
5 t9 N; X. L/ g9 J+ I' yto go
7 Z" F' L4 N7 B, v) e6 W0 S move-turtles+ m' w# v; Q. b- B
eat-grass6 m( D( s/ I6 T/ ?
reproduce$ K* _+ a- a' s3 B; q6 }" o) S
check-death
+ h* I% w6 i- _' r: S5 | regrow-grass. j' `. d m' n
do-plots
- y E0 k# J8 q$ v( j: u/ ]1 i P$ qend
$ I5 X, Z" C. h c" G/ D A3 K; V; cto move-turtles$ r4 |, b B) M- g2 |
ask turtles [5 w7 P9 k. N, p1 k. h
right random 360/ u- g7 S" U: e, F ^/ Z
forward 16 A) ?! H6 b- ~# I; t6 N4 N8 x' v; ]
set energy energy - 1- }! r! r. }% m
]
7 C6 K' F- |! W$ u+ f$ Iend2 j H5 A( @ `& O( Z5 O
to setup-patches
; T- @) }8 P& k, e ask patches [ set pcolor green ]' C8 ^) e$ y& s
end
! T0 o* X6 V0 L) t7 u9 Qto setup-turtles
, x3 h1 s# n W create-turtles 100
( f4 y9 S0 e7 i# ? ask turtles [ setxy random-xcor random-ycor ]
- g( C n; ]1 g$ eend" i1 o7 M$ ]! D7 q8 a9 j+ D. c
to eat-grass
$ Y% j5 H6 Q& ]7 k f ask turtles [- k5 Y8 d& T5 {& C" z4 h2 P4 [2 [5 ]
if pcolor = green [! A, t" ?9 L; J h" R3 k- {
set pcolor black2 [2 a) L6 z- b. N7 z1 ~
set energy (energy + 10)$ v3 u, i! Q2 H6 H T+ M
]4 a" j6 d A( \. @4 K0 A+ m
ifelse show-energy?
! D- B! i1 L& H$ t1 Y6 G; b8 ] [ set label energy ]. W. |2 Z" ^! ^: ]5 h5 {; o
[ set label "" ]
* U5 k0 H$ ?2 \ ]
5 |* X. A6 W! \end
7 s2 W) D; T9 c3 {9 }& S+ I# Tto reproduce
/ e/ Q( f* F3 o, Z2 c ask turtles [2 U/ l( w& L) n0 z. W2 R
if energy > 50 [& z$ i" Z0 r+ h; P+ _
set energy energy - 50
7 r) l' B7 @/ R hatch 1 [ set energy 50 ]
( o9 J. o: A% [) ^. O: j ]
6 J% {8 K x2 ]. c- S+ f ]2 P! v7 B% |0 Q9 G0 \1 F
end* ^, ^# ?4 S0 n$ L( ]. Z3 `9 X
to check-death
" \- f x% [% C7 P* A [9 P ask turtles [
, B1 ~$ h6 d9 O9 y6 c if energy <= 0 [ die ]
8 z7 R$ m/ B% r2 D ]$ h2 u( U& `6 J* r$ v" D" G9 Z
end% K- F/ f0 E! R `; B* k' K/ D& Q
to regrow-grass# {& n+ Q1 X3 g$ [: v* @5 z; G* E
ask patches [5 ?2 c3 E; M+ M: k `5 ?2 a
if random 100 < 3 [ set pcolor green ]! @5 J6 l& n- ?; g4 P8 O5 f
]$ E9 l- V- M9 `2 K1 I
end
$ G& \1 U# G) U& M6 a% R6 Xto do-plots" X% ~3 C- S% E5 ?8 V; m C
set-current-plot "Totals"5 c( V8 v) e' \! c: ?3 q) V
set-current-plot-pen "turtles"
- E+ E: N; i8 C+ X7 v6 C; V- h plot count turtles
2 {2 D' w& A2 @; ` k set-current-plot-pen "grass" N: {( }! T$ f) R4 B, P ~" h& {: V3 d
plot count patches with [pcolor = green]; u( h2 U E; \3 |- Z1 F
end: x4 _* p3 _0 i/ K6 K( P" P3 n
可是运行时提示no such plot: "Totals"( U1 ~( I7 ^7 Q5 D
error while observer running SET-CURRENT-PLOT0 P0 d9 W8 E: }5 I- i
called by procedure DO-PLOTS
d; t0 v) d i( A3 V* d* ]3 g called by procedure SETUP
! s& Q: v" Z# W8 A! o% O. A& `' _ called by 按钮 'setup'
& K2 ]9 f$ H9 P3 m* ]8 A8 T' c求大神解答啊 |