我编的程序如下turtles-own [energy]' P% u" i& |0 N2 {& ~
to setup
, }0 A$ Y( P' m. n& {! A. A4 b, b clear-all% g* N9 ~6 W/ O$ w4 V; S
setup-patches
* W$ [6 X3 b+ Z5 _ create-turtles 100; j, w# |# q" h" k+ w* p
do-plots8 A# v' [: {! m# M4 {3 }, J% R: f
ask turtles [ setxy random-xcor random-ycor ]
5 {; q5 r x/ |) x! U$ O; a* _# |end
' J! h; }8 L, p" @5 |to go
; m5 Y3 Y" n# b6 w9 e move-turtles
* D- a9 a" y$ L5 v% ] eat-grass6 z s# H% y- ?6 Z1 a( `6 A8 W& J
reproduce( b+ z( P* |3 i% q! n
check-death
0 |' Z' m5 o) l, v& A: h1 h regrow-grass
0 \3 A, X7 S! a8 w+ y9 v* }+ g do-plots+ n p9 B9 T2 C
end" C8 Q9 j- j8 l1 J( t0 Z0 B
to move-turtles
$ B4 K3 Y/ ^" i ask turtles [! |0 ^9 `+ z1 j$ _' D
right random 360+ @5 C3 ~! o! d
forward 12 a5 S" j/ k D, Z0 h& x& S
set energy energy - 1) e- i+ O, g- v
]3 U7 f+ N/ b; m, }. u
end+ ^" U" K+ B# o3 u9 |5 R- a7 X! ], F
to setup-patches
! R. n% A* x6 _' c ask patches [ set pcolor green ]( t! ]: X I, x3 q$ @4 ?+ q4 o( Q$ [8 \
end
- V+ R# L4 F2 d$ j( A, S- T4 fto setup-turtles
0 r& w( y/ _+ X" `5 g) o& l9 { create-turtles 100
. {2 Z8 N2 s( s( ?+ |7 g ask turtles [ setxy random-xcor random-ycor ]# h8 a. X# h# v7 g! V
end( X) J8 d n! p. m
to eat-grass: V6 I0 _# N2 m+ B9 [) M
ask turtles [
3 j+ Y# H3 d; L/ G; y: g if pcolor = green [1 R, f- h% u0 {; J
set pcolor black+ n$ q J# n) w6 F
set energy (energy + 10)% u1 j& d( j% E6 \# v
]8 J y7 R# F& i# Q. C
ifelse show-energy?' W. @8 q4 I0 N4 y4 D
[ set label energy ]
/ z# ^- u: i3 j [ set label "" ]
$ H# u- B/ a0 ] ]
2 ^; a9 _0 \# l/ w9 Zend
9 p' q1 K3 u( j7 b* x+ I4 Xto reproduce! _1 U. G' q& A) D7 T/ v$ B& D; D
ask turtles [
2 Z# N8 n: ^! U& P) W if energy > 50 [) C2 \3 \9 t" [: y' A+ T* s& t
set energy energy - 50
# G$ S0 U: m8 L3 b: X" T hatch 1 [ set energy 50 ]5 m3 N; V' D% r) M
]
% M4 e! W& B' ]( U- c ]) B6 v7 \. m! K. f ^& f0 `
end
( S! j# i& [" ato check-death1 U8 T$ j4 T/ Y2 {; d" g
ask turtles [! {8 D" [( _5 m: g. o* P
if energy <= 0 [ die ]
$ V3 y7 c, p: k, z/ J% W5 F ]
& e4 e, M2 a5 ~. send
* K5 g' d/ T8 [! c$ Yto regrow-grass
7 f) r M+ F! D9 v/ l2 ]# K: M8 {, _ ask patches [
( Z+ J B9 d D" g. M; p; m if random 100 < 3 [ set pcolor green ]3 v) T/ R! q" d" i
]
% X/ q- v( s) \- t- E; `end* C) H( K( ]1 y6 H$ [
to do-plots& T: ?, x o; }. q; S
set-current-plot "Totals"
1 ?+ b W# D8 H6 h0 z& G set-current-plot-pen "turtles"
4 A% [" }* R# z( f plot count turtles2 Y6 b) \6 [3 Q( R' X, o# e: Y: Z
set-current-plot-pen "grass"7 Z- _. o4 B6 P9 n6 H; @8 s9 |
plot count patches with [pcolor = green]& Y# j. b6 |$ A, ~0 J
end% W0 V, u/ \( |* z
可是运行时提示no such plot: "Totals"' G! D# \* G' k% V+ a' \' F% Q& J* {
error while observer running SET-CURRENT-PLOT
8 k' o9 K, W' r, c; c called by procedure DO-PLOTS
/ r* j1 v( i( u3 q- q" C. |' h called by procedure SETUP
* |7 }' L8 p" Z; u4 \( l, `' {8 d called by 按钮 'setup'- t7 T2 Z/ i- Y, d9 d0 V$ \
求大神解答啊 |