我编的程序如下turtles-own [energy]. [. P$ ?" Y9 u# y% A1 j
to setup6 d# e/ j1 F# D* V* \
clear-all
9 h, g; n6 F! X; P; s5 f+ m setup-patches
5 ~! [: e3 E2 Z* u. O2 V create-turtles 100, k; Z/ [4 f+ b3 t; W
do-plots1 S; j! I F6 G4 H: U
ask turtles [ setxy random-xcor random-ycor ]5 y; T; c3 F$ M/ E7 V
end
Z( J4 x9 u! @% Y% Q6 oto go8 I3 K$ P! P0 K* |4 V1 h1 P% P/ U, Y
move-turtles- S& _9 |5 Z* ~$ q
eat-grass
% W* ?/ P5 J" g* J2 u- a' q reproduce( @: }# @# d$ E) }% V' X3 p
check-death2 s5 n1 l* p6 y. b3 \$ n: S
regrow-grass
, m8 U6 N5 r( S; S; ]2 n- r do-plots o9 \; G! Z2 _) g
end
5 z+ X* F% {% R6 T9 ?% Q. vto move-turtles
: j! [3 o: O* b: z1 w/ S ask turtles [3 {" J( [ g5 }$ I- Y8 _5 z2 u, S
right random 360/ V( k0 @7 M) O; ?. M
forward 17 C8 z* x( e8 W
set energy energy - 1
% Q2 @7 {- Y- s5 A1 x ]
Y2 w+ U/ n1 ~- z% [) G. Lend
8 D, a# r: `' R) Y. [) Oto setup-patches0 T* i- Z3 D; G7 m3 Z' z
ask patches [ set pcolor green ]
, ?. u2 {( C' I( O p9 @8 Dend' p$ y! w; I0 W: Y
to setup-turtles
) x3 r, }, [2 z! ~ create-turtles 100
3 I6 k+ s6 s( _) J ask turtles [ setxy random-xcor random-ycor ]
' z5 B( Y/ e6 {* Q" o0 Jend0 s$ Y5 |0 u" M
to eat-grass+ K, D: e( b* W9 ?" R1 i
ask turtles [* z" j0 _+ F! G1 i
if pcolor = green [4 p5 J! i& |2 k2 t! _/ o4 q
set pcolor black: Q- m$ Y3 a6 V+ z
set energy (energy + 10)
/ {9 u. i/ y( k, ] ]8 _" n5 C" \- U. O% B
ifelse show-energy?4 G% ^ O" F& Y7 L
[ set label energy ]" ^# r/ V% d L: n1 V+ a
[ set label "" ]: Z- _$ y7 j P; A( s7 M
]
$ N. N5 K& S7 O2 u4 @8 r2 T0 i# z2 `9 u3 Iend
2 L, C* P! `+ x7 sto reproduce2 Y9 w4 `& i# _3 G+ ?$ i2 e
ask turtles [
& a/ x& b, c8 R if energy > 50 [) g7 Q* `9 K" L+ y
set energy energy - 50
" Z( u3 T* x# g2 V hatch 1 [ set energy 50 ]7 ?) B3 D& v- D! Z- ~1 X7 X ~1 ?
]
8 Z+ U# X4 M) H" }2 j; ^5 e ]3 j& R2 }* J6 y! E3 E4 M. e4 {
end
8 } L9 U& B: ^5 E" [. u! }to check-death
/ ^ u7 [+ p3 T# g4 ~% { ask turtles [: W4 t; |( Q" N4 g* R9 I o" Q* d
if energy <= 0 [ die ]
5 ^" w ]. j: \ ]3 j5 J5 @ o. o. i
end
0 v, q8 U, T) x6 {3 Lto regrow-grass+ v, k, F# r) k( B% `- {* O
ask patches [
8 j; `( p) T" m% j# r( n if random 100 < 3 [ set pcolor green ]
2 C& V& u( A% h ]* y/ c1 ], h& X- T. h& D: k
end4 K* K8 M6 X1 M9 l2 _7 @0 d
to do-plots, H8 v( C0 j+ S4 q
set-current-plot "Totals"
- f! Z8 ?: q* j1 N7 F! A. e- A, [ set-current-plot-pen "turtles"
; o* u) @! F; @* n plot count turtles
: d* d3 J0 O8 _3 Q+ e2 Z, b: y set-current-plot-pen "grass"- U A# F1 G- }0 Q
plot count patches with [pcolor = green]
/ G/ G) _3 e7 W- A( l9 ~end" Q* H2 E* W: M* O
可是运行时提示no such plot: "Totals"5 H% o3 ? O1 M6 F' _( x# X
error while observer running SET-CURRENT-PLOT! j& ^! ^8 l) W6 E" X6 i
called by procedure DO-PLOTS
7 K& d/ \- x0 j5 q called by procedure SETUP
4 \; k% G# C* w9 \ called by 按钮 'setup'& O. A9 W+ s1 e+ N5 L" ^2 b
求大神解答啊 |