我编的程序如下turtles-own [energy]: s9 z9 N8 ^* G* f
to setup
+ n" i1 K' W% H clear-all7 c" i% ]! \0 A9 z8 V% `& A
setup-patches& h r. S- Q- i2 m) I
create-turtles 100
/ _: @6 Z3 B1 Q+ c do-plots7 }" z2 ?" g1 s; t" |6 b' k% h0 w
ask turtles [ setxy random-xcor random-ycor ]0 n1 @' I8 W. H: `9 [
end
3 D1 N! O! B! p. M! @7 `& E9 lto go
! _1 \: \& F% b* s move-turtles" W) U6 [) m+ Y, q7 s
eat-grass
5 i2 `$ T% j# S$ @! d reproduce
8 j2 j: N7 }2 a1 s0 f check-death
: R a. T, ? g- x$ u& G" E regrow-grass
, b- h: _; \# ]* |9 U3 ] do-plots
- W% O, e% i* Y8 |. ~0 kend) k. B0 [# Z9 e4 Q# I# x- m3 v c
to move-turtles" ]1 G9 y: C* S3 m- e/ Q
ask turtles [
# q) P/ X8 X+ C5 j$ s' [ right random 360, a9 M0 b7 r0 j+ Z% [( x4 B
forward 1! x# L9 ^2 W% _/ X3 h" v; C
set energy energy - 1
+ y7 {8 r* U0 Z4 p5 W. W; z ]
" u) k% Z5 S1 D% i! y% Z. bend- c) C2 s3 @3 V3 I% j- a* b
to setup-patches
/ j6 ~' I' Z% C W$ [, S% ?+ n ask patches [ set pcolor green ]
( P# O' i! }: m+ ~$ _, z8 u/ Wend
! N0 [+ |' H R9 Bto setup-turtles+ B, |% P) f) O/ O1 d
create-turtles 100- i) P, {; q" h1 n3 w2 Y
ask turtles [ setxy random-xcor random-ycor ]+ X2 Y' g. @, U- f
end
3 r8 i( S! M, x5 w& e! Kto eat-grass
$ A! X* A& z5 ]0 x ask turtles [
3 K# ]. _1 O( N! W* }7 g9 O8 d& [7 x; A if pcolor = green [! [6 f6 k0 J( a: O) m8 p8 \8 @
set pcolor black" P2 U2 U5 y0 a7 C
set energy (energy + 10)
3 p' X% v7 ~9 Q6 f1 t$ s ]
\. e- A$ X8 J( w2 W. v ifelse show-energy?6 D6 A2 h0 q! j0 `; W- D4 V$ h! q
[ set label energy ]
$ p2 u$ d* d( l g0 G! Z: w: A [ set label "" ], B0 N0 V7 F7 W% m7 _, [
]
" p5 V* L. p$ v; o3 dend. k% x. M- S& [ X& r% N
to reproduce
9 q- a& L/ s$ l ask turtles [! V: V3 I1 z0 \ s% E& N2 [
if energy > 50 [
5 P) x; F3 k, u/ N R0 g! _ set energy energy - 50( @7 M* N& \ } I
hatch 1 [ set energy 50 ]
2 S9 T% t& P: D* [3 h: d3 d ]
* g7 g6 I2 V, g5 g. f# f ]( m/ g0 O! H' F& n
end
7 [' F x0 w2 N" bto check-death
( s6 D# W: {; J# @ ask turtles [+ X3 s' c! L6 X1 C
if energy <= 0 [ die ]+ {& S: c8 |2 w( ]; Z
]% q5 s+ x7 m* y* N1 L% g
end0 [7 v. j0 H4 m' U E. R1 T4 ?
to regrow-grass
* U! Q' H' D! A4 O. B: _; z" u ask patches [
4 r* ^, A4 k8 F2 I- o6 k if random 100 < 3 [ set pcolor green ]
' F4 \/ Z- w( u, s; `0 y ]- E+ b+ I" E2 J9 x
end& h' F+ ? s; j, x
to do-plots
% r4 f0 V6 t2 c* e3 f. C3 y8 V* d4 h set-current-plot "Totals"
V1 C9 R3 B, R- j, r# l: t set-current-plot-pen "turtles"# c/ Q2 T2 w' E) Y2 |; e7 S
plot count turtles
6 [0 H+ R6 h I6 {& k set-current-plot-pen "grass"
0 ]# J/ ?9 h7 H' y plot count patches with [pcolor = green]7 c2 d1 ^7 f6 `) r" E
end2 J3 y- F: t* P
可是运行时提示no such plot: "Totals"- C+ Q- J6 T6 d+ k* B1 n! Y
error while observer running SET-CURRENT-PLOT) l: N% i3 V v' M0 ]
called by procedure DO-PLOTS
1 X2 V9 \7 o0 b1 Q+ A; @ called by procedure SETUP% Q9 q. {' X$ G) B* ^. v" ` r
called by 按钮 'setup'% u* y9 P* a9 t6 t
求大神解答啊 |