我编的程序如下turtles-own [energy]; p% K( t6 b l' Q) \
to setup J# w1 A! F; E! Y3 k( q
clear-all
8 I8 i0 B9 M% o3 V- K setup-patches5 h( Q6 j0 n G% A& X- O/ ]
create-turtles 100
3 K q* N/ `+ r% ^ f- T K8 ? do-plots
W5 ^/ H% I5 ~8 i2 X! w: X. h ask turtles [ setxy random-xcor random-ycor ]* r( w5 ^ A, Q9 T. }5 w# b
end* e: |, d; N9 _1 R) K4 r7 W/ x
to go
" ~ H# J4 C# [5 n3 W# t7 D5 [ move-turtles9 c) G7 L) }* |5 A$ l( \7 \* J9 |
eat-grass
3 T Y& R& k# K& S reproduce
$ z) h+ U" a+ c6 c; a( D2 g check-death3 K( J3 D, _: ~. _' D
regrow-grass
" x/ T6 c9 Z' s4 L& z$ r8 ^" Q do-plots
% H, O1 R% T' p4 L2 w; Eend; Z/ D7 X" I3 u0 `
to move-turtles; }& A* M. A6 s: k
ask turtles [
% A8 Z. H: z4 b% H right random 3606 r4 ^. r4 ?8 Z4 H
forward 1+ Z" V; W: y. h; k
set energy energy - 12 d" {2 {) g; e8 U: d7 L! @% }3 w
]
9 w2 \- K5 C! K# Q# i# Qend
5 n& K1 @7 C) L3 f9 yto setup-patches8 b% Z; ^# x: o3 v1 Z( S
ask patches [ set pcolor green ]
& n- T# [ j7 D; W$ a `6 I8 m7 tend
$ X! h* ]2 h, k8 Z! u! {0 L" Zto setup-turtles# H& h4 q, }9 m0 M3 u$ v e
create-turtles 100
" |7 S. ~0 x. G* O( v) n: w& G# N ask turtles [ setxy random-xcor random-ycor ]
7 F& M2 [/ L6 ?end
4 L1 N7 C# f# Zto eat-grass; o0 P+ F, a/ Q8 t" X
ask turtles [8 }6 E9 K# y5 [4 d# B6 F
if pcolor = green [5 N; M& E: H: m
set pcolor black
8 c$ C! S2 ?! ?+ B2 _ set energy (energy + 10)
, X3 J# ]' C. M3 } ]
/ f7 {+ W8 Q' {) {, j ifelse show-energy?# S. \: x1 o2 d3 [0 M' ]+ x' `
[ set label energy ]
& Q9 a H, G6 [$ K3 U0 N [ set label "" ]
" V% x) R5 m2 R; ~9 w+ W ]
9 o! Z+ T. x- w4 `$ ?% eend
. ?5 P9 a! G/ S6 ^, y. `to reproduce7 F% b9 O. v/ C( B$ V; h9 ^
ask turtles [
, n- z5 ~! u3 s4 c: Z7 Z if energy > 50 [4 N# x: G% A. v+ V! T7 n
set energy energy - 50
) Q+ z( c* X% ^ [ hatch 1 [ set energy 50 ]
; M0 X9 b2 Y3 e c6 X- \' ?. L; w ]7 R9 g+ E- p: Q1 R
]
) a U7 |7 g qend
+ u8 q* F6 E3 P2 c n' tto check-death
, X) r/ i" I0 M8 y, }$ B5 e$ F ask turtles [9 K8 ]- K7 g% a* q' N
if energy <= 0 [ die ]
* n5 }/ o }9 }- [1 E ]1 ^. B! A1 @; W/ m7 v: [
end9 ^$ K! i7 z4 j
to regrow-grass
* Z$ \$ s x5 K- W7 y ask patches [
4 [3 @" W* a/ P' b if random 100 < 3 [ set pcolor green ]
7 B6 [! M0 P& D* v ]
$ ^& d6 r, i+ E! o, Qend' B+ f* c( n% r* d( i* B
to do-plots
1 y+ c1 @0 A U5 n! a7 _* ? set-current-plot "Totals"7 e% m6 G. v8 N& u5 S
set-current-plot-pen "turtles"
6 b, L3 x/ H; m9 w2 J6 x: S; w8 k8 g/ B plot count turtles6 ^& L: J0 W1 @
set-current-plot-pen "grass"0 I' R" e, W6 a w- G' u
plot count patches with [pcolor = green]) q. }5 Y& m! a8 W- l+ O' p9 D
end
1 K- F3 F* J" I U% {' ~. M6 c2 x可是运行时提示no such plot: "Totals"' J$ ?0 ?0 D7 o4 [1 x4 ?1 _
error while observer running SET-CURRENT-PLOT& O1 ^1 M) d7 s$ D" s) p/ X
called by procedure DO-PLOTS4 l; |2 Y! `) |" @
called by procedure SETUP C8 [& R- e5 a
called by 按钮 'setup'1 Y7 {! R5 U& S( M0 c: ^+ Z
求大神解答啊 |