我编的程序如下turtles-own [energy]. C' _5 v' R1 Y9 q6 R. M% A3 F
to setup
! P8 |# S) ?. w! l clear-all5 C: {# o' g8 X" y8 m6 x! G
setup-patches: E% q3 ]7 ]4 H X7 L. S' {
create-turtles 1001 Q9 U* A3 N3 E* h
do-plots
) T; G5 w0 m' `# f) r1 H ask turtles [ setxy random-xcor random-ycor ]
4 T% r+ r, n3 |) uend4 V c5 O- b3 _- |
to go
$ E& Q; q( J6 W5 Y& w* r8 o move-turtles
& B, y, ?' q$ r& ] eat-grass
3 V6 ^8 q5 }" ]* f7 a; E* a reproduce4 M* {- j* ~1 _; H
check-death$ V( v# p% d2 c" S7 r- R
regrow-grass
5 y H& {6 d/ ?. E) _ do-plots7 k# ^/ \, j2 O6 |' Z8 q2 b
end! X2 H5 _4 q& m( o$ l
to move-turtles
; ]& |6 @' s' P$ y: n4 B) ^5 |4 r ask turtles [7 K% I! d1 \8 t
right random 360
5 G3 C! q& j& q/ y- {5 n forward 13 u4 X, U! R) v
set energy energy - 14 q) F/ }- R5 O( u7 W, ^
]
) Q( r( O( L4 u/ [) Eend
6 _7 b2 J) t! H: Dto setup-patches
1 j- m# b& a6 ~ ask patches [ set pcolor green ]7 O6 {$ i+ x: Y% Q% X
end" o3 Y6 I# D3 e# J( w
to setup-turtles
. |9 q. x- l" u. H( f create-turtles 100
& e$ q: G! V+ W; [7 t/ G9 [! X. j ask turtles [ setxy random-xcor random-ycor ]5 c; v$ c0 p7 x J1 O1 S6 \- Y
end
% ` \0 {- c( A7 pto eat-grass
% g! i) e4 K, {$ J) {3 l" ] ask turtles [2 h( O3 ?; R% ?" F
if pcolor = green [4 X& K; M3 r/ N/ z. ~$ Y& Q6 M+ c. ?
set pcolor black# q0 }6 V+ V! p9 M {* {8 b
set energy (energy + 10)9 F1 ^/ E4 a, v2 g; D! G
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ifelse show-energy?4 N& O5 {3 n* M( [6 ]
[ set label energy ]
: _/ F& W3 ~$ }+ N7 \) h; Z, L! ~# L [ set label "" ]# X. j" x. y+ N# Q& x+ R
]
0 Y" g+ V% V4 b3 f! \! J9 E$ ]end
, H' d, |6 O' G9 a+ [! C5 ]4 r$ Jto reproduce
7 d+ w( }9 W/ J* K! r9 C ask turtles [ m9 v& q5 e' w2 _3 |( P& W3 H9 @
if energy > 50 [
+ T8 y# s% Q# _ set energy energy - 500 A) M& B m! t9 e" R& [
hatch 1 [ set energy 50 ]6 I% e; g$ S x0 B) [" A+ a
]
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' N# k B1 v+ u9 X% pend) m3 J+ h$ ], }( ]$ b! b- `
to check-death# ^# d S$ z3 t U& |
ask turtles [
$ E8 A, \, H/ z. w- t if energy <= 0 [ die ]
9 e. X2 B+ Y" u0 k3 j ]
~$ r8 ?/ e" m! T8 S+ \end+ p( M6 [; e8 I! w, O
to regrow-grass
# y/ ?& _( x9 p. Z! P8 l9 b2 y ask patches [8 y, D7 Y- j) e/ l' v
if random 100 < 3 [ set pcolor green ]. t( i" I. ?. |% Z F1 B
]. p/ Z, `0 r! z8 G* S
end
) @* ]8 q D' \0 O% Hto do-plots
; ]" @9 y+ f" c# Y' y) X0 ^ set-current-plot "Totals". ~( W4 O5 L9 y9 X- j6 c6 o
set-current-plot-pen "turtles"- K. U7 Y: m5 I. ]
plot count turtles b3 @" j! x2 c$ G O: A# m
set-current-plot-pen "grass"
; a% a8 U0 t, `+ n! k+ Y plot count patches with [pcolor = green]
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可是运行时提示no such plot: "Totals"
3 O5 g8 N6 v. [2 N7 y$ h1 Nerror while observer running SET-CURRENT-PLOT
$ D4 d+ V5 d7 j& | called by procedure DO-PLOTS$ F4 }4 [1 n A. u3 s/ w+ V
called by procedure SETUP, M' n. a5 @$ d
called by 按钮 'setup'1 D3 S+ y y' o; I
求大神解答啊 |