我编的程序如下turtles-own [energy]9 ], {8 {9 a7 k
to setup0 e1 l0 T* E# d6 p
clear-all1 b6 z' y' d! {7 W$ |
setup-patches0 O4 }; j8 c( {0 `
create-turtles 100
y: R6 ^1 a6 t0 |- X do-plots
3 ~+ n' I' _& K) n& Q ask turtles [ setxy random-xcor random-ycor ]
- z. }1 k9 q" v- ` X: bend
6 B: P, v: `# c* X/ Sto go
% y" K1 W( o: p/ @2 Y move-turtles, O! ~" o% g' v: \* \
eat-grass
& ^- L+ ~$ ^* W" F' ?, ^0 x2 D reproduce
% @# }+ f" A5 J. w check-death% z( H7 d$ | r4 _5 o
regrow-grass
/ b# M% q4 K6 @* b& }' E z do-plots* {$ z: [& x' _# o* \
end
0 D1 P; [9 Z9 o7 S2 o2 r0 }to move-turtles
/ F9 Z/ h7 u$ B% R: G8 l ask turtles [; G1 \) W w8 C) g$ u+ v f6 p
right random 3606 f3 A* E; s/ U* P" m1 S' L
forward 1
0 l g% l- C8 A( a% { set energy energy - 1
% ^& l" @" a h; T0 m% B0 [ ]
" v# w6 u1 ~" d: X8 h ], g2 M$ {. qend
" N- r( i0 w* r/ R/ x1 A, eto setup-patches% ?7 N2 F& W- T
ask patches [ set pcolor green ]
- ?+ W; u8 w6 Z+ |! f! x& vend
" C6 f6 m2 d% B$ U5 V) z9 m3 t" yto setup-turtles
]# J0 {# K- G create-turtles 100! d+ D) ]; h C+ |
ask turtles [ setxy random-xcor random-ycor ]3 h/ @. _. X: a: P
end
; s5 T! a k0 p: O/ g/ g* ?8 [7 K9 mto eat-grass. G' ]+ R R* S$ \4 w2 T% v
ask turtles [9 e* a" D3 A7 X6 C6 n- |
if pcolor = green [
$ S( E1 \) m6 H4 E, ?/ P7 h- @ set pcolor black3 U2 o6 J& t) t7 y- j5 a
set energy (energy + 10): C6 A, O D$ D V) a1 {
]
( J& |2 V3 c3 K m. c9 L! F$ _" } ifelse show-energy?0 C. I9 i9 O, x8 F
[ set label energy ]
; b0 z) U' x9 }; h! F9 Q- j [ set label "" ]" S# h8 ~- G4 o: A+ P2 S
]% o0 w4 [7 |/ D! s# p
end3 k% d. F$ d. Y/ i! A, F
to reproduce
& c# W$ ?9 h4 n% J7 G% L$ ? ask turtles [
0 I6 z2 I8 S* V2 V s if energy > 50 [
4 ]9 B+ h+ t+ g! Y& [ set energy energy - 50
' x5 l/ `, U) r hatch 1 [ set energy 50 ]
W$ j8 C5 {9 L ]
& O% |+ F- d. ^ ]2 H6 ]6 }# J* g
end
0 I/ q& e& y0 U9 W1 i, {to check-death
5 w" v$ b, p6 v ask turtles [% S% y( i6 n7 g% V( S( Q' y$ R. ~
if energy <= 0 [ die ]0 s: c3 b* p& C- j
]
! W3 I( q; H: n9 Zend7 y6 B! U' p, U
to regrow-grass
' D+ s q2 f% ?* Q- y# c ask patches [0 e( f7 z1 a( f2 w9 |, v
if random 100 < 3 [ set pcolor green ]& W. T9 h5 K5 N `$ J
]" n- Q+ E3 J' c% d
end+ ]7 o& v- H7 G! D
to do-plots
% u6 l" P- q! ` set-current-plot "Totals"
2 W3 s- ?1 [+ x! W set-current-plot-pen "turtles"1 I2 k$ z$ q) g7 }' ?
plot count turtles
! F( l$ u1 z. k$ @# S set-current-plot-pen "grass"$ c* f; C- [3 t1 Y: Q+ C- E+ L
plot count patches with [pcolor = green]5 K! f: {, S+ {+ Y
end
) M$ t* N7 y" P9 l3 K [可是运行时提示no such plot: "Totals"# R0 D& t% Z0 Z4 A) `
error while observer running SET-CURRENT-PLOT6 V; W0 M; k' P, w. h
called by procedure DO-PLOTS
' ?6 R0 W$ {8 `1 n% j. L/ D called by procedure SETUP
4 S& U" R( w+ ]1 C2 `3 I. D called by 按钮 'setup', s! _9 D7 w3 v# i4 k
求大神解答啊 |