我编的程序如下turtles-own [energy]! J9 z1 i! h r8 C+ _1 F: N
to setup
/ x0 ^5 Q. @5 a$ Z- f clear-all
3 m% w0 \" @/ n! G8 z X setup-patches
1 d; \) e/ ]) w create-turtles 100* `! Q! L$ J: q8 n3 j7 g8 @
do-plots
# |$ H: t0 h! u ask turtles [ setxy random-xcor random-ycor ]2 z! E, s* t0 e) `
end
7 }/ z+ U& K8 B1 ~to go1 t9 B6 V! O$ C Y. P
move-turtles& H r5 y$ Z4 t
eat-grass
& g+ L2 O$ h' w% F9 b# B9 r/ L( r4 K reproduce
0 k! u, }. M$ u, L check-death4 u. N# j5 Q" h- f9 P) x
regrow-grass5 p% U8 q- x4 K! L
do-plots
% k, F6 `7 N) W9 Q4 Z3 Q0 C2 h. Fend+ i# \/ X# T! E& ]4 f: s0 t
to move-turtles
. Z3 [' Q+ g: o! G ask turtles [9 t1 m% i# D. A' S
right random 360+ m) J' Q3 q) }) r% l
forward 1% X; x$ e' x" v( K
set energy energy - 1
$ m! M$ i2 M1 T+ ~6 e6 z7 p ]
5 }9 N1 p6 g" W2 j1 I$ tend* K$ H% l; E+ B& ~. x& {6 v
to setup-patches
+ y1 l5 N" i( V1 Q! ]7 m ask patches [ set pcolor green ]
b7 l) M/ X0 Q- j( d5 `end
% j) l/ ?, O: N: b+ k( g2 l% ^to setup-turtles1 H/ g5 ? t( v& ]' F
create-turtles 1003 m. Q$ Q U- ]; B% V6 z, k4 f% X
ask turtles [ setxy random-xcor random-ycor ]
* Z1 E) Z7 `2 @# ^/ Y! j( fend
% J P9 {' |; X+ n% r1 n% d5 nto eat-grass
3 t7 B. X8 ]+ q1 c- h ask turtles [4 ?+ y8 |: D( D
if pcolor = green [9 j- V" l' q/ b* R% Q& k
set pcolor black
, V- O j2 E+ A set energy (energy + 10)
2 _; ]+ e* q5 }, y; ^# } ]# }$ K; \1 n# [$ `
ifelse show-energy?
5 \5 a. t8 ?4 h" Q* m# P# k [ set label energy ]
6 t3 P. ]- w1 u; w [ set label "" ]7 w5 f6 [& a8 m& ]2 I5 X- W
]
+ n& i$ S" |* Q& S* w- Iend6 i/ U* R' k) e l9 t0 P. E, W
to reproduce
0 S2 G( J5 G2 C ask turtles [
2 G$ E- U# M3 b' E, u8 V B5 P& Q0 k if energy > 50 [
, x4 X* _1 o: y2 z set energy energy - 50+ S( Y, k0 f$ z9 D; G$ ^0 v% ~
hatch 1 [ set energy 50 ]/ z: ~, E2 ]( x
]( o2 @2 U% E0 N _$ D6 K
]
3 F/ E( {/ J( p6 lend' f8 b! Y1 ^! E8 f* Y
to check-death
$ F* K( v+ B' b7 E( b4 p ask turtles [
1 I% I% {% i1 M1 K/ f1 S0 s if energy <= 0 [ die ]& w: `* A3 c' ?& Z+ {- ?
]- ]1 _2 o# B! ~9 `, i, v
end$ C J! c1 d1 M( D5 { w3 ^9 x
to regrow-grass
' h! t* o% {+ Q( }" X1 a& } ask patches [
; q: b5 Q/ y" `. S% s+ | if random 100 < 3 [ set pcolor green ]
5 S9 p; y' W& \1 U ]
: _3 p6 b, ~5 f j% `end2 j* I6 ^4 n8 ^" {% Q
to do-plots& I- ^. X% B z/ R) k& H
set-current-plot "Totals"
2 g" p- u2 E$ y' o$ H set-current-plot-pen "turtles"' A; f, S/ f3 I! a- V
plot count turtles
$ u; y' ~8 b0 z- l% ]. ]4 e set-current-plot-pen "grass"
. U. G7 A. x# F! D' D3 n% m plot count patches with [pcolor = green]
" y/ E, ^4 T. b# I1 m1 j, Z$ v# [end6 d: y: x' C) v8 V! _% ?# J
可是运行时提示no such plot: "Totals"4 r3 Q6 P1 {/ X7 ^# {: Y0 {
error while observer running SET-CURRENT-PLOT
% {: f. p9 ?2 y h/ H* n+ b$ X/ v called by procedure DO-PLOTS
# i& r S# L' W" q$ ]- N- O called by procedure SETUP7 x6 k3 H" P" g
called by 按钮 'setup' N& C3 P8 O7 w* k0 F7 ?. J( s+ g
求大神解答啊 |