我编的程序如下turtles-own [energy]$ \) l1 ], x# P- o5 Q" a# D
to setup
( q/ v- h9 O) d& e# \8 e# S clear-all7 Y- l, k4 `6 B5 v: m
setup-patches
1 ?9 p3 U' i$ r create-turtles 100- d8 ]& b, v; M3 q6 l
do-plots
. b. y4 a0 r+ N" M" j( }( ? ask turtles [ setxy random-xcor random-ycor ]
5 L1 d2 t6 {5 z3 e" g# Qend
- S% E/ y; G( _9 Uto go& c8 p! u; P! _: C2 s+ m2 C
move-turtles( l' H# } t+ i, d+ p; v) C4 Y6 ]
eat-grass I( v, J+ ]4 V- e, `# ~
reproduce+ D9 P, @( J6 }7 W5 g
check-death
- W, a$ i: o( d9 R. p regrow-grass2 q/ v) I" ^% E; P
do-plots
- b/ {4 o% _6 Y) R6 \end
$ Y6 q5 f1 F$ w; vto move-turtles, l' Q) P# Y% k0 ^# u
ask turtles [7 w- \2 I, I* m! ^* ]
right random 360
" D1 B& C8 a' | P forward 1
- j% @' d X, a* `# d f1 C& @7 B G set energy energy - 1
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end
; X: Z. C5 S2 |7 t( i" v, R/ L" Eto setup-patches
6 v, A H' G9 \" V ask patches [ set pcolor green ]1 h; y; F2 R5 d0 ?/ }$ R
end% D/ N: Q5 E( j5 B5 W
to setup-turtles g( ]7 t1 V9 c1 U! z+ x
create-turtles 100
) ^8 Q8 F W2 j4 a- m* h ask turtles [ setxy random-xcor random-ycor ]
" f4 D8 [+ O" ]* T; t( wend
( _" J* ~. V6 j3 D# i2 O% rto eat-grass
5 z$ m. A+ a) j4 h! h ask turtles [
' O- }7 Y/ u. B1 U if pcolor = green [$ }2 G' ]* h- \0 [
set pcolor black
# h; E3 W% ~3 Y# `( R8 ` set energy (energy + 10)
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ifelse show-energy?
' k# W9 y9 ^8 c$ ?0 s [ set label energy ]7 M+ I* q* R+ `
[ set label "" ]
# e! j0 u1 Z. A ]
9 u+ ^: o9 V) U- vend
4 z4 U, J7 R8 [. nto reproduce
- l+ e, `- T1 O) X ask turtles [
* k7 ~# D! N8 L+ [- a& x if energy > 50 [
# `4 W0 P/ w4 } set energy energy - 500 _& J5 C( ~0 R+ K
hatch 1 [ set energy 50 ]- l: v7 H4 j- r' {9 m/ |9 O/ h6 X
]
/ K4 U- l4 W" }3 y ]
. q U H8 b5 F |% D0 A" f3 p4 B1 Mend
6 j: K- e0 e; ?0 Yto check-death
% {7 {3 O1 H- H/ a4 z ask turtles [
3 ~# n: L8 e- I if energy <= 0 [ die ]
, c" t5 ~5 G# o1 P0 x, b1 b0 P ]
/ {5 T2 Q' F' { s! A/ wend
" _ J5 |2 U4 V$ y0 C% w1 d9 M3 ?to regrow-grass2 F7 r' c# G" H+ W/ s8 J1 }7 j
ask patches [; G7 j: F& f3 J- q
if random 100 < 3 [ set pcolor green ]+ B+ i s0 Q" d+ S
]- |# i7 t3 ^% |
end
4 y W" _+ \% A9 V X5 @9 p. u# tto do-plots
& h5 H7 \' S) h& {' D6 ~! }9 c set-current-plot "Totals") `2 d* W: K1 s# w. W3 ]& O9 z
set-current-plot-pen "turtles"
& o$ n+ g' I6 ^/ d plot count turtles
3 h% R" c$ Y9 W8 D set-current-plot-pen "grass"
4 ^. L; o2 y( y5 W plot count patches with [pcolor = green]% d2 l% V2 O' F3 D$ E" l
end. l6 Q- u+ `$ D) T( T7 k% I6 A
可是运行时提示no such plot: "Totals"
/ b" ^' y$ ^9 y, U3 x! [& Xerror while observer running SET-CURRENT-PLOT
5 {1 a2 z: J. N8 \' ~/ R called by procedure DO-PLOTS
6 [4 y% d' }$ W5 I* y4 i$ t0 ]0 E called by procedure SETUP* d. B, D1 Y4 g3 a+ r
called by 按钮 'setup'
0 f+ G9 ]3 ?$ a: q. e求大神解答啊 |