我编的程序如下turtles-own [energy]( U! u' L' \1 [# h. w
to setup3 K" ^& C |2 O5 T. ]% w% b: E
clear-all5 K6 j% |1 u4 e- ^# O- t
setup-patches1 ?6 d5 S2 B5 [/ Z z- n7 a
create-turtles 100
# a3 u, O- H( S. b2 d do-plots: R/ ~5 T! `/ g$ u: f9 m) W4 \
ask turtles [ setxy random-xcor random-ycor ]8 ?0 a5 C6 a; v5 ^6 D8 y
end; r6 L' k8 ]* [6 a1 ?- y; w3 c% C) Q
to go
, V K/ z$ l: s move-turtles. C& g5 o0 F" V( X, V4 `6 e& v+ c; U
eat-grass
0 L/ t0 A' }, y* R reproduce
& R/ ` z& ?1 W# }3 E% o3 ?0 q8 Q/ a5 P check-death
: O/ O0 B0 T/ _2 d regrow-grass
$ z8 ^/ b; Y/ `& B do-plots
" l' r: z. W( q: O: I1 q4 q' L/ T$ Nend
4 @ s: H$ k$ H) F* y, ]to move-turtles( ~5 w1 _ C J1 K0 U
ask turtles [+ Q# H) @7 ~3 S. N/ u/ G) m! D) e
right random 360
8 n) v, E; R) b forward 1
8 G0 c1 P1 T7 W6 T6 I" _9 b" q) @, f set energy energy - 1
( l, J. m& ?; a$ k% k ]8 Z- E6 p @; }
end& H! w! e ]# a% E
to setup-patches
4 d; M; O3 g% k, | ask patches [ set pcolor green ]
8 t+ J5 ^2 i& q: f7 R9 R; z( hend# ] N8 X3 [& R; Y3 r6 I+ t
to setup-turtles5 N | T1 @$ z7 G! d# }6 w( [
create-turtles 100$ H4 w' Z' i: q! I! ?6 V
ask turtles [ setxy random-xcor random-ycor ]
2 ?% @/ O* q) W4 Kend
7 I, {7 X/ ?8 `1 Cto eat-grass
. @% q; `" X( \ ask turtles [
+ t( J1 G' t/ X7 H if pcolor = green [
% e8 K( R) t9 J1 q( |( ]7 M' ] set pcolor black& X& I7 v. p* E! e. L' ?# ^
set energy (energy + 10)+ [0 F4 _+ a% s/ Q( `; {3 P
]. @7 t, Q; k" y8 J) o# K' {; j' a
ifelse show-energy?5 e6 c# j& C- R6 V; x
[ set label energy ]
* l2 @* M8 s" L% E7 k [ set label "" ]) H9 P, ^: Y# \7 E% o
]! c* J! x+ a& g2 k& A
end P! G5 I" c0 a& D/ n5 Q
to reproduce5 z& p* p2 p$ T+ b
ask turtles [# ?, _6 p7 a- u% f+ w
if energy > 50 [
, O }3 t( m& b/ ^- |7 w0 T set energy energy - 50
: x! O( w8 s1 {% ]' v hatch 1 [ set energy 50 ]
1 m# L- Y, s, ]0 L ]& I) {! J& f. w/ s) r V
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end
/ w1 ^2 D! Z- d- q* n" m B8 \to check-death
) ~' r$ A- B# r$ c, W6 i ask turtles [+ n. U! ^4 M$ ^# ^. E( W0 A
if energy <= 0 [ die ]# p. |$ H% C4 I) G( Z
]% M4 V# u7 u$ }7 K* G9 w. q3 e
end
2 J% [5 H7 t2 m- [7 J- K* D0 s% a( Ato regrow-grass
$ K/ A$ f) V8 \/ T4 v" Y- G/ j ask patches [
1 w7 s* X7 F3 n5 k if random 100 < 3 [ set pcolor green ]
0 y- s) P, {; y4 d: r; t$ `! O( } w ]4 j1 p6 e4 i: M
end
/ `! S$ n- ?$ g- r1 V& K" xto do-plots
) y4 G5 U5 D! l* W set-current-plot "Totals"0 o( z3 W$ w1 `7 A0 I
set-current-plot-pen "turtles"! L' @4 y% q L/ p) {
plot count turtles2 H# |1 x) a* b' L, C" N
set-current-plot-pen "grass"
7 Y X4 E7 D+ x0 L. Z. H( ] plot count patches with [pcolor = green]1 D( E* z( C, Y( @! I
end; \' ^" U8 G2 k, L- P
可是运行时提示no such plot: "Totals"' X" q- j# M$ g. w& V% e
error while observer running SET-CURRENT-PLOT5 z5 a8 `- Z/ L. c* N
called by procedure DO-PLOTS
% H! L9 J% [* G2 @/ N8 w5 ~: ]0 m called by procedure SETUP( G6 b1 s4 e P0 @7 l0 Q0 @# I! `" ]
called by 按钮 'setup'& O9 f! C3 N7 }/ f; ]% @; o) q
求大神解答啊 |