我编的程序如下turtles-own [energy]; c/ ~( k4 v# J) Z J
to setup9 D, u; W6 R" b. g+ E+ k
clear-all- P* o5 k+ Z- H: o! o
setup-patches
$ C, Q6 d% d" D9 o create-turtles 100
2 n' M8 y, A$ k& j6 [0 D do-plots
5 C2 y9 J/ P3 E4 r ask turtles [ setxy random-xcor random-ycor ], T9 v5 l& [6 M1 r6 w A
end2 h/ Z! K: s9 c; c0 S4 F
to go
/ R) J/ R4 p6 O; K1 U* e X* F move-turtles
3 X# \; t( I7 U( o, R/ ?7 o eat-grass
0 A, u( l2 Y, i" [9 ]% V reproduce" A7 O# s$ x& {4 S! Q
check-death
3 ?) J+ p. J) m5 I regrow-grass
' L; _ P1 a7 v5 d0 D) Z do-plots
; g8 m, \5 K6 I. fend2 t4 ~3 @9 ~- V4 H! m8 B
to move-turtles( v p d8 I7 T% U
ask turtles [
9 d1 I2 O% s! J7 Z$ h; K2 R( w right random 360
1 _ e" m* W& c: L( n4 _ forward 1
- f' P" b3 U# ~3 Z set energy energy - 14 _ j% T, y5 B( @# H; m0 A/ k
]' ]# M$ ]: k5 ^6 L. w+ q
end
5 V0 O# {1 v. _' fto setup-patches2 u% Z' D+ @$ U8 A
ask patches [ set pcolor green ]
. R7 s' Q4 k+ W& y3 ?5 Y/ bend4 o7 A8 E7 q$ |
to setup-turtles; E+ I- @6 H1 }9 R8 E# @
create-turtles 1003 h' E3 Z$ Y% V- e- x- {1 ?% f4 l, W
ask turtles [ setxy random-xcor random-ycor ]* i% t4 K# m9 W* }5 y. S
end. S, m0 d* ?& x' A
to eat-grass9 O" \; R, t3 T! F( h0 j0 y
ask turtles [2 L5 O* g1 r; K/ K) f
if pcolor = green [
1 o7 D" }/ C& P set pcolor black
& x+ X# H; N$ B! {2 n: n' i set energy (energy + 10)) `8 M( m/ U- [) B9 G! C8 v
]
3 {- U7 C3 h( X" E: N8 o ifelse show-energy?* W) }+ Z: n* ?+ m: J, x
[ set label energy ]9 ^# _; ^4 {, G% N2 f
[ set label "" ]. @+ z* d2 c2 w8 a5 |" W( U
]
, o0 w2 G8 M0 e2 U# oend
$ c+ h7 Y @8 F# ]/ v% K3 X2 tto reproduce
/ p# N0 O E2 }8 x+ w& e ask turtles [# z- \" `' @ i- G! Y. F
if energy > 50 [ ?4 p# M) m# i; P1 p
set energy energy - 50
2 p! d4 G- F2 ~. e hatch 1 [ set energy 50 ]
4 A- u/ D. [- }2 d ]5 J3 o+ U! o9 Z/ Q: ^; G
]
; j# o* f n% y3 ` B' z6 Oend1 u J, A, D2 z( R! ~" m
to check-death
7 t9 ^& B1 U: W; y; I6 E+ g# } ask turtles [
, k1 g" N# m# n' t: ^5 } if energy <= 0 [ die ]
! q3 y, W* i, n, q/ N" _+ m/ k! S ]
/ R% Z! p4 V+ i, g3 Nend1 ~ U# B' r# R1 U. M0 T
to regrow-grass
, G( w" M5 U' x ask patches [
/ z* |3 ?3 \' Z! V+ E2 _; T1 J) f5 g0 L if random 100 < 3 [ set pcolor green ]
/ Y2 z5 A9 D3 B3 a' X ]
) g' k8 ]4 t- V0 ]2 _3 a$ yend
f* N( d( P7 O1 }# E Pto do-plots
9 d: C6 {% z m- V# ~: l U4 B set-current-plot "Totals"7 K3 X# _/ F) ]6 r
set-current-plot-pen "turtles". @% j& h& l( `5 ]
plot count turtles
; L% w1 }& y! i) _$ f9 J set-current-plot-pen "grass"
7 l8 u, j6 }' _. k, [ plot count patches with [pcolor = green]
- |- m1 y3 P; T3 S- W7 }' rend1 ]% d7 q$ Y& [" ]3 C3 N8 W) a
可是运行时提示no such plot: "Totals") R5 x5 D: o& H1 l+ F* f
error while observer running SET-CURRENT-PLOT
. A1 r7 Z0 t D+ q called by procedure DO-PLOTS( {2 [& H. N# c" `# ]
called by procedure SETUP
+ B6 D( O# e& r( F' o+ r called by 按钮 'setup'
% d \% k6 r. ^3 M7 ^- B' t求大神解答啊 |