我编的程序如下turtles-own [energy]( B$ b' A. t8 I+ u6 u( R& k! Y
to setup
9 M; b$ R" p" {1 @" W clear-all5 ~ l4 `6 J) w: ~& p7 w, _1 P
setup-patches
% C l J& P! T6 Y2 p7 b5 ^ create-turtles 1008 J. I: U0 M: c
do-plots
- A* t1 Z0 @& J* J! c7 [8 _ ask turtles [ setxy random-xcor random-ycor ]
9 D. d, S0 W4 Hend
! [, c" V1 E1 Kto go9 D) l' T g- q* x9 V0 |+ V
move-turtles4 D( m# W$ A% }9 J/ U# h
eat-grass! u, O# B" k, s
reproduce$ z& R- r0 Z% R0 [; B5 Y. h) Q
check-death! d3 c1 @2 W/ q8 n+ I
regrow-grass
/ e9 M7 _4 m* x* [ do-plots
0 p; C3 N# }4 v# O0 N: ?( `& R6 Y5 send3 \+ _( p( Q7 }# e. P. o
to move-turtles
8 Q, i! _& F3 n- F7 [) K ask turtles [" p2 G3 {( X- M( X1 x7 f: C2 A
right random 360, u% g4 [& K- d9 c4 B; F; U
forward 1
5 {3 P3 K' O* Q1 h2 V set energy energy - 1( E+ p! M: p6 x- i7 k
]
' K% n, E7 p6 ~! P. dend
8 o, k: l- i$ j! E N5 S( tto setup-patches6 |+ f2 J4 q. m) n$ s
ask patches [ set pcolor green ]: ?) _3 h ~' b4 y7 O
end
: c! B0 C3 Z( e2 T" Yto setup-turtles
' }# \/ P5 L, K& ]" | create-turtles 100
+ _4 W. D$ F$ ?, @: _6 ~ ask turtles [ setxy random-xcor random-ycor ]" s8 }6 A7 r: i- v3 P6 a) Z$ P
end5 J) C* ^2 h6 T# k9 I; g
to eat-grass
4 y( ~$ q- U$ b5 Q9 l ask turtles [
0 T3 a: M& `4 ?% I- P" C/ w* C if pcolor = green [+ p# Q/ v8 p9 V" v/ d$ _
set pcolor black
) M: J+ `8 L! a$ q0 K& I set energy (energy + 10)
% D% }$ v8 J7 E0 h9 t& o ]
$ q1 i! V! {6 a! e P ifelse show-energy?
5 v. k' v% m: `' c [ set label energy ]; E' c1 K# p6 k9 t/ e7 ^5 c
[ set label "" ]# Z4 V- r* o9 T q( O" b. o
]& p6 [1 ^+ }! L; O
end3 v7 r% U8 A* u0 j" P
to reproduce/ {6 x' E q) W& G. s
ask turtles [
& G6 \7 v1 }. B if energy > 50 [
' U$ e/ W2 U ~+ P0 [9 ?, n9 I set energy energy - 504 i3 W) X9 g" C- {% V
hatch 1 [ set energy 50 ], a2 \. F9 T4 f8 B$ k* K) J1 N
]
3 ]+ B4 m9 ^ i ]
' O! s. t* ~) y* N0 @end9 Q( s( p8 n: r
to check-death$ K" G9 Z1 D! g- V8 W
ask turtles [ N- G" l/ _' k2 l' r
if energy <= 0 [ die ]( o, g' @6 a4 Y
]
" P# R8 R3 i& t7 q9 hend
' Z4 p0 U: e9 k W4 l5 e' Mto regrow-grass
: ~" p, I' |, B ask patches [( p% w! `- K9 P
if random 100 < 3 [ set pcolor green ]
4 L) y$ K& {- ?; [ ]
- R4 n& P% B& u: q) l9 F( uend
* S4 Y1 d7 F. {to do-plots: P+ P% ~9 M4 g7 t b
set-current-plot "Totals"7 l& r- A1 d1 O& H Y' m& y6 ^
set-current-plot-pen "turtles"
x: L! `. J7 j: { plot count turtles
; E# v" K6 ^5 v+ A2 u& B set-current-plot-pen "grass"
, F' [2 u* U. J/ A plot count patches with [pcolor = green], X" @4 t! X' v: K
end6 r, o( w7 k; z4 \0 F9 I% E- O% V
可是运行时提示no such plot: "Totals"
8 a! C1 K$ m" s R+ {. ierror while observer running SET-CURRENT-PLOT& l8 O2 z* ~7 ~( y% i7 z1 S
called by procedure DO-PLOTS1 F( f: Y# T! G8 }. i& b3 r
called by procedure SETUP/ ~" [# y Q0 T) `! f2 x
called by 按钮 'setup', q7 g# K" R: [% J8 q5 g1 W/ E1 \
求大神解答啊 |