我编的程序如下turtles-own [energy]
$ ?6 Y6 k7 y- v( \0 M3 `to setup7 s1 Q! _0 y- z$ J5 f+ Y
clear-all
! e" H* F3 a, a+ B2 T9 @% z setup-patches, f( ?4 N0 H( m$ N/ R
create-turtles 100
, z9 B7 d9 K3 U2 T* V do-plots
/ r3 G: |) r5 t) d+ ? ask turtles [ setxy random-xcor random-ycor ]) y& H" ^% f0 K" v C- Q
end5 P% p7 I7 b1 x+ `, q
to go
0 Q6 h! w: {8 g* L7 L move-turtles
8 ~3 b3 f; F( ]2 a8 `3 J; e eat-grass
2 n0 g# H0 _! J2 ]2 p) r reproduce2 j+ Q* f1 @0 E, s! `% A
check-death6 O. _6 s# `2 o9 R% b @& f
regrow-grass
( u( U; Y& q5 e do-plots
- F8 t1 U3 A( W2 y! gend
. u9 {8 G7 Z) s. Y5 `) zto move-turtles
@% y; p' ^4 Q1 T% }% t/ m ask turtles [* \4 O; P4 W6 O# g Z3 g
right random 360' v% k) T% P% j# N
forward 17 ]; |4 O: g- M' N6 N6 q/ o) L4 q
set energy energy - 1/ v9 r) X0 M0 C1 W, ^6 c+ i# B
]9 V1 y' m" _/ a
end
% i- p# K( G7 Gto setup-patches
$ y/ O' P4 r7 p ask patches [ set pcolor green ]
* c; k7 c* t5 u8 t, i6 i( E* Gend4 J; y* |% L* ^( n S; M9 k t
to setup-turtles
* j6 `: a/ ?& A8 C create-turtles 1001 P8 {' {: D+ @/ E
ask turtles [ setxy random-xcor random-ycor ]$ ~( v4 X; ~3 X ~6 V) B- o. n
end
5 k7 H' ?; b$ j ]5 j" i% Cto eat-grass* E* N) Q J' |4 Y3 `9 g* N
ask turtles [
6 [- M2 x, h& X% k1 u, S; ?9 Z if pcolor = green [
9 \+ J5 p) v( b" q+ I set pcolor black9 m" A& N0 l9 S+ n7 U* o
set energy (energy + 10)2 h' C* b5 G+ u) A1 Q& ]& P2 X
]2 U6 T/ M' R0 \9 _! w( x" P% T
ifelse show-energy?, {! x+ @+ E/ u0 O" K' x
[ set label energy ]0 ^- g# {& s1 F+ l# b
[ set label "" ]
: z4 n8 Y$ j* X0 C q! P ]. L$ E4 Q9 F, _4 n
end
5 @* E7 D; \$ S$ w) T6 f& Q6 M2 Wto reproduce
0 L) s: a1 b3 v7 i' \/ R! d ask turtles [
- M- a" b3 F$ e0 D, g% e+ [; m: s; J if energy > 50 [
8 p9 b& g2 j2 T6 ~% }5 p f set energy energy - 50
1 M' M G2 B3 R( C. H% X hatch 1 [ set energy 50 ]
) t% y, {! M( Z' `- m/ h$ R0 t ]9 |5 V7 E& l6 n7 \& W$ X
]
; V, e- N& t$ K/ D+ S: }end
. M" k% r2 i4 K( V7 ^* Pto check-death2 J! R& P* D- E% s; U x
ask turtles [; j4 i5 w7 S! A! s9 K$ B' f' o
if energy <= 0 [ die ]
: M! H/ G$ ^! ], ~5 M+ O H4 l ]
2 V: n6 e1 o* _; ?6 J( N1 C& Dend: L# q( b* `' H: I) J
to regrow-grass
5 I$ T# \8 F7 g' } ask patches [
( T& g, g7 o( @. O1 J; ?# y) V/ M if random 100 < 3 [ set pcolor green ]. D) ^; c9 |% E) r
]2 C1 Z: v. P3 l! j( K7 c. ?1 {0 Y8 x
end
- ^% l; q! J* w6 Vto do-plots% G1 {* l" @ a0 p$ d0 c5 _3 p
set-current-plot "Totals"
1 `) D+ k5 `; B" | set-current-plot-pen "turtles"
6 {3 y! P1 a- @ plot count turtles* E* v1 Z6 ]) x; F1 r! N/ ]
set-current-plot-pen "grass"
0 D s$ D6 Y3 B4 B' f9 ` plot count patches with [pcolor = green]
" }- I( [1 `3 H/ O3 R/ ?end5 q; G s1 n8 P4 r" Z# w. J/ n7 i
可是运行时提示no such plot: "Totals"4 V5 O5 M" ]# Y% L% d
error while observer running SET-CURRENT-PLOT
6 ^& I! g1 p0 G) H& F called by procedure DO-PLOTS0 h. R+ X f9 q& f
called by procedure SETUP
2 `! f$ V% b* q( Y7 `1 n2 ?8 u called by 按钮 'setup'" V6 L8 E8 ^0 d* m# d8 P( C
求大神解答啊 |