我编的程序如下turtles-own [energy]
2 A& X% D E- Q f# h( R; Y- ]& Rto setup
9 ` X$ Z4 t" C; i3 v: Q, f0 Q1 C7 D clear-all1 @$ r6 l9 O9 z( K
setup-patches
2 r; q7 B8 F4 S2 Y6 P# f create-turtles 100( o; {9 u! p0 V6 j; b1 C
do-plots" F$ U' [$ r( T' S
ask turtles [ setxy random-xcor random-ycor ]
, ?6 h; E, Z" mend% Q) C. B5 S: E$ M H
to go
* z# d" |7 H9 c U4 G# R( S6 H move-turtles
: l0 n( D) W: m' |8 F eat-grass, S( Q4 s/ j5 z6 J' `! M
reproduce
5 ^. T5 X# s# P N: S9 U check-death- _8 O5 [2 \8 K
regrow-grass9 t8 d1 z2 y5 y, u) V) Y) T% ~/ H
do-plots9 z) E% f$ I# Y8 C% y2 O
end0 E* @6 s3 K2 @, s8 g5 o5 [
to move-turtles% j7 R1 c: T% u2 `# G5 r& |$ w) Q
ask turtles [
. U9 d, H1 v. b# \# ` right random 3606 `( K$ W3 z+ f+ l. V1 ?
forward 1$ K, b z/ |4 H3 R% d U6 n/ q
set energy energy - 1
/ m5 U8 f9 J8 K- _& e7 y- { ]) c/ t% j8 e. J) q
end, E; M- L$ d z" W: y) Q+ i
to setup-patches
0 R d% b2 F- P# [8 J+ Y" q! h ask patches [ set pcolor green ]
# r1 }# B( @ O# M: t4 Q8 fend' d) a7 W) @, d% h+ k
to setup-turtles
( N: Z' i4 _ {# w8 @ create-turtles 100% b: j: J# y( D4 K) D4 F9 W
ask turtles [ setxy random-xcor random-ycor ]
4 A( | m4 k# \$ @end, D( D8 I, x+ A0 K8 I
to eat-grass6 R/ b h8 \- x/ J7 l+ l# J
ask turtles [
% i# F9 `% u! m e' D# ` if pcolor = green [
8 a" _+ M2 a- \4 u set pcolor black
1 b- @; ~: J. h \ y( S set energy (energy + 10)
' ]* z8 [* ^* Z" x3 F; S4 F ]8 ]6 K! s6 V5 p
ifelse show-energy?* K- b+ A* e3 C5 I# X- O
[ set label energy ]8 {( y4 ~# R4 S2 s
[ set label "" ]6 Z) W* _! Q; @8 c$ m
]( |, I% A3 i) w* o# X
end6 d0 N, m8 k u0 _% \( R; R+ h
to reproduce
9 e9 _3 p1 |0 i+ b$ P ask turtles [
- @1 b8 r, B- ~, e if energy > 50 [* }+ n2 D/ W- [2 \ K; l
set energy energy - 504 v$ `; f2 |* Z7 ~9 D* J
hatch 1 [ set energy 50 ]
3 y( f8 g& @, d' O$ |+ u ]
- h4 u1 ~/ O5 J; A, \+ a ]0 w* w4 ^+ r: j
end
3 X g' Q* N- P. gto check-death* T6 _. J/ e; g2 s% Z: A
ask turtles [
, x1 d2 h- K& m2 {/ @- Q1 V! n if energy <= 0 [ die ] T) {+ r7 o( i. ^, Q7 `9 J& I
]3 ]! z0 ~1 S a2 I& b1 Q
end, |4 p' s. S7 L5 K" |
to regrow-grass, u9 b/ F5 X+ G F) I) e! U0 r
ask patches [5 R3 q1 t2 l1 ] Z
if random 100 < 3 [ set pcolor green ]+ v3 L0 z4 \; o$ L x7 \8 B
]
( v8 z# k) A& `: [end
8 S7 s/ c. `3 S/ N3 Y) z3 Q) |to do-plots5 W, F; U8 n f4 F
set-current-plot "Totals"
1 Z+ o. o- t: o" G; |" ? set-current-plot-pen "turtles"* z. h* g! w3 i/ _" D3 k7 @
plot count turtles# Q( d5 y2 d3 d% u( Z3 p) t6 a
set-current-plot-pen "grass": ^# x9 l- e n" z% D& v
plot count patches with [pcolor = green]+ [- J& N3 Z9 X0 m+ m
end
3 p- G, R; K1 `& j4 n; l& l$ |可是运行时提示no such plot: "Totals"; G7 ^( t, d" x0 z% c8 M
error while observer running SET-CURRENT-PLOT
) n& H+ Z- h$ V) K called by procedure DO-PLOTS
* _! j- V6 H& O! w% N0 ~7 l, N/ f# V called by procedure SETUP
I; Q% o! p1 U called by 按钮 'setup'- [+ S! z8 C& ~1 D, p, E
求大神解答啊 |