我编的程序如下turtles-own [energy]6 x3 E: x, ~( q* R( [- w' @; P
to setup
! r ^2 E& j# H! z; X/ c3 s3 o clear-all& U5 u' F! K% l7 r# Q
setup-patches! p, P: }/ E( J
create-turtles 1007 { Y9 g1 b2 J+ i* |# x$ A
do-plots
* J0 O$ S! y( i% C ask turtles [ setxy random-xcor random-ycor ]% ~# `! p7 K# _
end
7 E8 |& `5 i t# j& eto go
2 a/ f0 v& A; D3 }' @ move-turtles
' h( y" X3 {# p: s1 ^, l2 B eat-grass
+ m- ~% K l% s1 t# u2 p. z reproduce
& @+ R1 V. I/ g% r% R check-death/ \# A4 z& O5 \+ B, T- g& {9 Y
regrow-grass
) o3 F3 I6 r0 @ i9 z do-plots
4 _6 L1 S+ m" y' q2 @end
! w4 K7 T- O& u5 Q Bto move-turtles% p' p" W# |2 j0 U9 E) Q" z( _ I
ask turtles [
. {* P; [% C& O6 B) ]1 n0 y right random 360
. Y; I1 L+ q, _ forward 1% {" T0 d- R: U0 V( M
set energy energy - 1
2 ^% r2 o3 U' R$ v+ Q1 m- ? ], J" z. `6 }8 V
end. Y) _5 k O4 t2 P) O
to setup-patches
6 d. l3 r/ y- F/ F9 E. J" k ask patches [ set pcolor green ]
8 N- p' Y; n' Lend1 T% a# V4 V0 K& |9 O8 D" ^1 F
to setup-turtles
3 C+ m' Y% t' P3 W3 y create-turtles 100# P2 t, F8 s3 L. N- E; A9 `
ask turtles [ setxy random-xcor random-ycor ]+ C+ v. w2 {/ |( O; ]/ o. X/ @
end
" |/ c) g5 l% B$ uto eat-grass
' ?: c5 x& S$ n- x9 j( O, k ask turtles [
2 K) n' _. r0 B( Y3 w$ G if pcolor = green [
, \& [) P1 r' j1 d* ~; S& ? set pcolor black, i) y P( H/ j) d8 M* X8 z! o
set energy (energy + 10) [1 w9 L2 m0 Z7 M
]
/ f9 c: K% g8 R9 m ifelse show-energy?# b; J* l i( ]8 u/ |1 W+ A
[ set label energy ]8 }( Z5 R1 {4 N9 S) l
[ set label "" ]8 ^3 I4 e1 E$ P8 z* j
]! B$ e p4 A! K" ^. C
end
& H% ^) a3 y! Y- W/ }to reproduce
5 H3 D3 B% E8 N$ j ask turtles [8 n: O7 B/ O/ F
if energy > 50 [
" q( M Z7 s4 C. u' _- @$ F5 A \ set energy energy - 50% U1 \5 @, S+ a
hatch 1 [ set energy 50 ]
# g4 t) S8 `. h& w) T. u1 R ]) _( R( v6 e9 V7 }! ?& O- q% n
]2 w, W n3 o! @0 y9 U8 l
end. o/ L; c6 U/ a) L/ h
to check-death
! P0 g# B- ~2 X' O) ~' |/ ?. ~/ ] ask turtles [% J4 h: ]( l4 B5 E; y
if energy <= 0 [ die ]9 e' _$ z4 [+ h* |! D) r
]. S: t( f) V# {
end
- r+ r5 J6 Q: v9 F# Z/ }5 qto regrow-grass( z+ M$ d( k A2 {
ask patches [
- q1 p0 h& A* i if random 100 < 3 [ set pcolor green ]; ]) v: |2 k' s3 r( Y
]
# n5 {0 s. v- |. d# M8 oend. e' w5 I" `# J9 o v j
to do-plots
0 d! Q/ E7 J) B0 G. L. S) j8 k set-current-plot "Totals"5 j- {0 m1 p: `+ N- Q
set-current-plot-pen "turtles"! H. J, {2 F) X3 `, i; v! G( Z
plot count turtles6 B% t# Q/ F. N7 C2 `" g. S7 h8 A
set-current-plot-pen "grass"
0 ^/ y5 |' r. x plot count patches with [pcolor = green]
$ c9 @; I( B- _9 x( eend# Z- A) j$ b$ C, h; z W
可是运行时提示no such plot: "Totals"
! J7 P# s8 M5 B# Jerror while observer running SET-CURRENT-PLOT
& W8 ^7 V+ c; I2 {, j+ v& K called by procedure DO-PLOTS
% v: c' {: d% |4 k9 F; ]' I4 n called by procedure SETUP* f; q3 q/ x. L8 Z
called by 按钮 'setup'+ k) w4 Y0 d- F$ J0 _: y1 q
求大神解答啊 |