我编的程序如下turtles-own [energy]
' N+ @# s* c8 d9 g& h( C& T/ Mto setup
1 S' K. c! Z5 G4 N/ b clear-all
0 V8 z" c3 Q X; m5 s setup-patches
, @9 K7 l; Z! U6 s2 d) @ create-turtles 1000 U' f4 |' r5 C6 u( O9 D5 ?4 X
do-plots
3 v, p( f2 o# R- }; k/ M. \ ask turtles [ setxy random-xcor random-ycor ]) d2 S' C5 u2 l, v, g9 q" Z$ W! M
end# m# X ~2 j/ @
to go' ^9 n" t* g( k$ N- o
move-turtles( G% [1 i3 d8 q0 k7 P, n x/ R; K
eat-grass
2 Y: Q' A, H' b) I. D1 p1 o7 m reproduce' {( f) r. }, G. Z2 |- E
check-death! f. ~5 ^4 [5 X3 ^0 r" ~
regrow-grass
6 Y$ W" K, g" y7 k* R do-plots. L. { p$ ?* Q; a% P* w4 P
end1 ~! X* R6 {5 p: b$ A+ b' l# _
to move-turtles
$ r. r* T* l7 t8 R7 ~; b b% ` ask turtles [
$ e% H/ M3 {1 ~- e O right random 360
/ R _- _" s9 E! X" c# b forward 1, N- _1 l' i8 Z) m8 a7 |+ ~# D( Y
set energy energy - 18 _! h' B$ A B0 e6 y) {5 C2 w
]
" S! ?& m$ `5 B% v: |2 Yend
( L- e" j3 w' D2 d8 Oto setup-patches
$ V) Z* R' T2 h ask patches [ set pcolor green ]$ x# Q5 f7 \% d: ?4 ~
end
/ w% _8 C) v C/ G7 p4 h( Oto setup-turtles+ B) W) K9 F/ n) I9 s- a& S
create-turtles 100
5 c9 o9 {, G4 |) [7 s, U ask turtles [ setxy random-xcor random-ycor ]
8 F* L# o4 s; Aend
9 ~5 d# C$ [0 g9 Z' x0 ^: f" Ato eat-grass
3 d% s8 N6 B$ h ask turtles [
; X; ~/ c9 d% T$ m( }( A if pcolor = green [# q! }* n& C6 }# C1 f3 E; N
set pcolor black' [# W* i. T1 O5 U% N
set energy (energy + 10)
. f! ]# W* X2 W4 i* c3 P ]- ^5 |4 i& Q+ R
ifelse show-energy?3 x& k4 I) V; O: p5 p" t( [
[ set label energy ]
( w# }7 R) Q1 S7 Z [ set label "" ]5 E& t( g" `: N0 v* H2 t% I. V
]) u; F( I) L7 \7 n
end4 L; q7 }* r5 h
to reproduce) i5 W d9 y2 b+ c
ask turtles [
7 K* x# Q# j) Z, M; P( j8 p# X W if energy > 50 [. L1 X3 \0 N8 O( b" J# {
set energy energy - 50
9 l6 N' |$ \ f hatch 1 [ set energy 50 ]0 j: Q7 T6 i6 k4 ^+ p# m6 R8 L* a% t
]; K+ P4 t- e8 ?6 k; A
]
; h/ [% D2 a8 tend3 v+ u+ p3 B& |& h7 U% \( i9 ~
to check-death
8 H; r N8 L5 {. O$ n" X6 u ask turtles [+ f) ^5 ^+ @7 H3 D/ D* W1 i
if energy <= 0 [ die ]
5 E+ E9 H" p$ O2 |9 d ]
P, j; q: m, pend
, u) M- X% ^2 e% |2 b# P! Q! tto regrow-grass
& q% K4 N( Q4 g ask patches [
) M4 y9 [; B3 [9 n( _2 z if random 100 < 3 [ set pcolor green ]4 |/ g) D3 O: p6 B. `
]# k+ p5 o, q; l9 `; k# L
end2 \7 W$ G5 u$ C; J
to do-plots
; s3 H. Y1 P3 V8 L$ Q set-current-plot "Totals"
: I& }+ Y% L- P0 T set-current-plot-pen "turtles"
$ h# i6 P' F# s+ u! G) @ plot count turtles
# ^1 E# X ^" e, b# t set-current-plot-pen "grass". E$ E2 ~5 H) C( `' i# a
plot count patches with [pcolor = green]6 N& ]& f5 b: R
end
6 u* N7 J% R% R% K2 E+ N8 b可是运行时提示no such plot: "Totals"; W+ Q4 l% d0 R
error while observer running SET-CURRENT-PLOT
: V0 m% U7 n5 `- d called by procedure DO-PLOTS
- j$ q3 Q" d, T called by procedure SETUP, [/ E" b. V" \* _$ M: B I8 i
called by 按钮 'setup'
. f+ ]. T1 `6 H) I, U4 G, h( Z3 @9 g求大神解答啊 |