我编的程序如下turtles-own [energy]
* L0 s: T$ s4 C& yto setup
* q' t$ W8 z r; a4 Q clear-all$ w, v2 B0 B0 D6 `, r
setup-patches
/ z; Q) x4 N- a0 U create-turtles 100, e, R2 @( G( L* }
do-plots
# _3 l( A$ C0 K1 }& n8 [) L0 R) { ask turtles [ setxy random-xcor random-ycor ]
9 v6 ? x5 e7 R# c8 O9 X6 kend
: {6 j6 ?- \; Yto go
4 R( W7 g- N* q* c# \3 F% w- | move-turtles3 w3 }4 [) W, h3 m. s. }& Q
eat-grass, s) {0 b5 _7 d F& ?5 x
reproduce& t B* {. x* P+ n
check-death
% R* y" G$ k/ W g% f8 ?% L) ?* Q6 G regrow-grass$ P6 p0 b% ~& B# f" X$ r
do-plots# ]2 F0 |- t% W" q% w* @/ \
end
, m6 [, |$ C0 tto move-turtles
u9 P: J/ d. Q W+ U ask turtles [
0 L6 `$ C% B0 ?5 o right random 360
3 n! R4 ^, ^1 H5 F3 L: K" ? forward 1
4 U9 V0 f$ F+ u( A set energy energy - 1
& m- T" @4 Z# S' ~4 R) E6 j ]
+ }! [+ ?3 C; S- B. Jend# D4 i; i- h+ J+ b3 `
to setup-patches( e2 v9 P+ p" Z0 M! F9 F
ask patches [ set pcolor green ]$ n! D! H9 o) ~6 e) e1 u
end! H; J) L8 Q. I7 _, a& c- x) p F
to setup-turtles) j2 d* Q9 j8 @( V) V! N( D C! E
create-turtles 1002 I/ z% N4 R4 _ r3 g3 O
ask turtles [ setxy random-xcor random-ycor ]" o0 a3 j& P/ ]: Y
end
8 Y/ T2 J) b) b+ A3 S! @to eat-grass4 ~0 Q" O% D0 u+ v
ask turtles [
; @8 H5 o2 r7 P if pcolor = green [
- z1 d+ {, r/ }0 C* h$ m set pcolor black" k8 a" N% q ~0 R+ I$ e/ f& h
set energy (energy + 10)1 Z9 U8 ^6 W. v0 H! l! @$ z
]
' W1 \) b6 A) L, y ifelse show-energy?
$ z4 Q H8 ?5 f* Y [ set label energy ]3 L5 k; W6 W' T& _4 [ c
[ set label "" ]
/ B, v" x& q- u8 H' b" F+ [$ H0 R ]
" q2 I: ?" l- Q8 \" @0 T7 Fend
% |& L: C8 }6 t& @) rto reproduce! [' D4 I) ^6 g# I
ask turtles [
& E$ y' t/ t5 ? if energy > 50 [
" T1 z2 Z; i h- U% S8 N( | set energy energy - 50
$ F, d- {1 C- Z* e7 O+ J" e hatch 1 [ set energy 50 ]- e% b( a/ E, g: \# H& m( x
]
- i6 a: c- s9 f2 D" T& w ]. K w+ x7 P4 ~
end1 _/ _: t1 T7 X+ E
to check-death! c$ |; Y5 H% q, D+ }: i8 K
ask turtles [+ v/ b f' {& G3 A; o
if energy <= 0 [ die ]; @9 I! X, ?7 b$ O i
]( [1 p0 p. X! E5 G0 R. e1 n2 t
end
6 J/ @2 x7 N' }% B0 w# W( G/ Kto regrow-grass
; V* R! e z `0 O" l/ M# j8 z ask patches [$ F& h7 p- M. V* O1 V+ S( L6 f# Z5 p- m
if random 100 < 3 [ set pcolor green ]2 Y! _7 \# ^) o G. { q$ q! J
]
5 r" I' n# U" L! nend
1 r9 o% d# x( _/ \3 [to do-plots; k# ?) M6 r8 q7 \! U2 X) s1 q
set-current-plot "Totals"
* d9 t* |9 ?* Z0 e. J set-current-plot-pen "turtles"" Y. n. j+ g( X
plot count turtles: c/ R0 [2 `' t
set-current-plot-pen "grass"
* v0 N; w$ L( H* H2 {1 h plot count patches with [pcolor = green]9 [5 _& {' ?3 l2 c2 B/ J8 v. P5 b
end, P; |2 d3 M4 ^
可是运行时提示no such plot: "Totals"
$ ~5 x3 e9 w& { S, H9 ^" O$ Kerror while observer running SET-CURRENT-PLOT8 ~# r7 T; w+ R; _
called by procedure DO-PLOTS
0 ?; t4 ~# ~% S( f. s& d) r6 O called by procedure SETUP
! K! s: S& y c8 E) j, _% v2 j+ A called by 按钮 'setup'# L- ^, `3 b) ~
求大神解答啊 |