我编的程序如下turtles-own [energy]
9 l" {2 z: B1 q- G+ o7 E+ _to setup
% A) \! w, r1 ~3 C clear-all
+ _( a0 v( ?& ] setup-patches# M& r H: f; W; V# n( ^/ M* g
create-turtles 100
* K, }& U: r9 P+ E1 U do-plots
8 i" G) C' s4 I: Y5 S6 R ask turtles [ setxy random-xcor random-ycor ]
+ R( k8 c0 T3 Y) j6 G2 [end
, }! g/ G3 b, N. B1 Y' Y6 [+ s9 m$ j1 uto go% D, o$ Y) K, X( r5 K! ]" A
move-turtles4 @) H2 A: V5 M. ]
eat-grass( u7 _( T' L; }: y& I8 j1 i
reproduce
3 b9 q* C& S( a. Q+ c8 U check-death/ P) A* f! X% f5 g, h
regrow-grass. {, N' x% q' v: ~# f7 G* R
do-plots0 z$ A5 X. U9 T( z" c, R/ ^6 m
end
7 O, C% k# g# ato move-turtles& ^' M* c" W* T+ d5 u
ask turtles [# K# _* D& B, i
right random 360
* Q: L: C! \$ [ forward 1
" n, H+ M0 p2 A' h( H( Z, R$ H set energy energy - 14 t3 p2 M% Z! L: o. _' }0 k
]- B% j g3 j* Y1 F' t5 L. N. o
end, `2 O) g" I* j; B3 Z
to setup-patches, D3 |% u v( |7 o) ~
ask patches [ set pcolor green ]( [9 r$ m, T, ^9 u0 [* Y0 q( X. x
end- a/ {6 e' {5 `( I' I7 q
to setup-turtles
* p$ o& p$ `" a3 Y create-turtles 1007 F9 ]2 u9 S! a2 {8 Q% E
ask turtles [ setxy random-xcor random-ycor ]
; z* m6 W& z2 U7 eend& y! ?/ K |+ n8 C+ w- G4 e2 f$ a
to eat-grass6 _$ E0 f1 N- B* H6 e' g: W
ask turtles [& n1 [. ?5 e l6 _/ u r3 m
if pcolor = green [7 g# V* U+ X/ |& B
set pcolor black; ^% Z+ J2 _) r2 a8 S: j- z
set energy (energy + 10)4 u; z; `+ d' B% _' H
]
. l" N4 [' D5 V) Z' W0 s ifelse show-energy?
, }6 ^2 a) w: r/ \3 A [ set label energy ]
! o( u" H1 `$ G$ ~: J [ set label "" ]0 B- `5 X: h: r& c$ p' j
]
' ^& Z. f; Q4 j' Vend5 N/ a- F# {5 w _
to reproduce A4 X* {- Z/ g8 \/ ~- U8 X! T
ask turtles [( A( J/ n2 Y6 Z! P1 X
if energy > 50 [
7 R! J6 h/ Q$ z& _# g! c set energy energy - 50/ W( F7 n( }! \1 S+ H* U- ?6 {; I6 x
hatch 1 [ set energy 50 ]1 }4 Z/ P. i& D
]
( y6 ]9 H L, r1 {; _1 y- ^# l ]
0 }' ~9 p$ X3 K! Gend6 n1 Y& e; o6 F9 C2 J
to check-death
4 g7 Q2 F' X! S( o' d ask turtles [$ P6 g2 j! D4 b
if energy <= 0 [ die ]$ t" A s$ |7 P8 O! G. L- v
]/ r% \ U( o- \/ f: R: `
end \% S4 q! ?9 `+ J7 ~/ m9 j* e
to regrow-grass
. M: h* R! i3 h9 j/ G ask patches [6 I! C1 Q8 q3 M* w
if random 100 < 3 [ set pcolor green ]# ^/ a) U) g3 K) ^
] I/ E2 o9 r5 j/ {
end! [, @' t: b \ {
to do-plots
2 R, { J% V% F4 E0 U# k set-current-plot "Totals"
6 T i8 e- ^3 m" v set-current-plot-pen "turtles"' J" ~4 y* [3 O0 n9 X+ v4 U
plot count turtles
( f7 P: m @: r2 ^5 i# y6 v- j5 R9 w set-current-plot-pen "grass"
8 ]) _5 f3 D2 L. z$ j/ W plot count patches with [pcolor = green]$ j a$ q/ O, W1 F* N/ j/ M
end% ~' `, [/ H( N7 a* F
可是运行时提示no such plot: "Totals"
: b0 G- V4 w' N" F$ lerror while observer running SET-CURRENT-PLOT
5 X, Z: J& m6 X2 Q& k/ e& o called by procedure DO-PLOTS2 T( B0 F2 E! _6 F
called by procedure SETUP
# P `! D) ]# ?& g6 }0 [ m called by 按钮 'setup', M1 |; c9 b; f7 P% ^
求大神解答啊 |