我编的程序如下turtles-own [energy]1 I# l; I* H, [2 r2 W
to setup
& R& E: i: x p; [! v clear-all
! D0 s$ v) K v" C& Q* G setup-patches0 s9 P- o7 l3 t" N2 g ]
create-turtles 100: y. B1 k+ ?* q ~
do-plots2 ^. E8 N' o* D& Q0 y1 U7 |
ask turtles [ setxy random-xcor random-ycor ]' p L i) b' B4 o/ {7 S( ]
end" O- w* \; t h e z
to go
$ @3 {2 a8 [3 L0 [. q move-turtles7 M0 }: o6 R- z# g% D" w; v7 c
eat-grass
( N8 o4 i9 K+ V! ` Z reproduce
* ]) R2 k h, \0 d `5 B8 }: v( N$ W check-death, V' ~9 `! I p* g3 {
regrow-grass
" f5 Z# ` l8 Z6 _' N do-plots" q0 X1 m3 l W1 G
end
" A4 \( f. z& [7 N+ ?4 ato move-turtles, Z- L( I% f" M5 p: n
ask turtles [* x& I* \8 A" d/ Y# E# X
right random 360
5 x o! X9 e" |' ~ forward 1/ f1 r: u2 L; [: p
set energy energy - 1
2 j- T' u/ K: ~! p B. @ ]
0 o( e/ B% o6 G8 V8 w% tend
: f# I+ Y' s9 F2 I, ?1 \to setup-patches
- n: U2 ` C9 i! c' x" _ ask patches [ set pcolor green ]5 \0 w5 |% `6 T0 m: W- c" e @
end# j T% ~; b1 s% `
to setup-turtles
4 |1 t' Q4 o7 v, W6 l2 [$ Q& r create-turtles 100
4 V3 W1 ?: A0 j5 U" [3 \ ask turtles [ setxy random-xcor random-ycor ]
, ^& T) G+ \& @) G6 C" wend
( Q8 p2 {- }: [. e% M6 Q3 g0 gto eat-grass
. c" r1 f7 m4 M, f$ V8 r ask turtles [5 i! N5 K+ U4 f% y9 Q
if pcolor = green [
5 r% F1 y' a5 J" |9 f+ q2 g t% [. F set pcolor black- f' c5 H. q+ N; N
set energy (energy + 10)
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. j5 f1 ]5 a4 N1 b4 q ifelse show-energy?
. q0 v8 W' P( g- B" N/ z! v, S1 M [ set label energy ]
! I; w/ w9 M0 r" c" \1 u5 q6 s [ set label "" ]3 L2 |; G" q5 `) U5 R
]
5 h- y) z l, Q+ c8 }# Y$ Send
0 }3 U" y Z6 v% i' F ^: N" qto reproduce
2 O) m; m8 l1 j" k ask turtles [
; M3 T: P4 K; m$ n' P' S if energy > 50 [
/ g9 E- e2 t2 \' O% p/ g/ v set energy energy - 50. P* C6 \' d2 U0 [" b6 s0 f5 ~- w( Z' C
hatch 1 [ set energy 50 ]
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# ^4 S% |1 F, h5 N. b& k# B1 j ]
* T$ X, h* ~+ g3 g5 J$ pend5 d, X* y; T/ d# o3 Z
to check-death
4 O; ~9 d: v( U8 N( c1 o' I ask turtles [
2 f9 D# C9 a) M% m5 k* K if energy <= 0 [ die ]
. B c" P8 Q& x0 ? ]
u8 m2 h0 \$ pend# J7 `1 ]& K9 I0 B! a% U
to regrow-grass
: U# M T/ ~; Y4 y# y ask patches [ P& `& }. x$ C. e- {4 k
if random 100 < 3 [ set pcolor green ]
( R0 }! @& z+ k ]* h' v, s! f6 d( @8 a: P
end/ s; i+ q& B2 P m* R
to do-plots3 f. ]) V) l; h9 \+ t k" f( c
set-current-plot "Totals"1 J. d3 z- e4 x. T
set-current-plot-pen "turtles"
, o; q+ U* d2 T; T) f! f plot count turtles
% E s- N6 V }7 S8 \7 t1 @ set-current-plot-pen "grass"0 `5 l$ U. X ]* `1 L: U0 ?
plot count patches with [pcolor = green]0 A" f4 D8 ]( l" K% Z4 a5 r0 m' n
end! Z; F7 c+ M6 H! g( o: c
可是运行时提示no such plot: "Totals"8 E! i4 G* \/ r
error while observer running SET-CURRENT-PLOT
O( U% H. I: }' Y1 R called by procedure DO-PLOTS+ e' N& K. k, [" z1 b y! r) _
called by procedure SETUP! U H2 G# \/ `9 j* X2 m- X
called by 按钮 'setup'# b0 ]9 x# ]7 K; U0 N5 c' m
求大神解答啊 |