我编的程序如下turtles-own [energy]8 d/ h& b. [' L4 p# J9 y9 E, L
to setup
4 \( u( f4 o: K4 c4 L1 K clear-all2 r% d) G/ g2 t1 h: ?4 c+ [+ o
setup-patches
, [/ K5 r9 G6 o$ C2 t- ] create-turtles 100
( L" m6 Y$ T+ I do-plots
8 |# R! b0 y. g( u ask turtles [ setxy random-xcor random-ycor ]
& z# g1 D! ?$ _ S6 C2 O7 b7 qend
( j2 M8 c- x0 }( ato go
. b# T8 {4 c: F+ K+ M move-turtles$ P( w5 T1 D3 j% F6 a
eat-grass6 |- i$ H, Y7 {' B
reproduce% \* Z0 V9 k5 O* e, J% P
check-death7 j9 B0 I5 M: T
regrow-grass
& q: { H) c7 Z E do-plots
6 i" C6 L* N: L9 d$ h3 bend
* p( f" Z2 j+ L( @to move-turtles
/ _: h1 k2 E7 N% p( u6 F9 o; _ ask turtles [& |1 s* {: _* \, {8 e& H
right random 360
# Q+ ?3 w/ ?. H# H t5 l# C; i0 m forward 1) V. z; t. }% d+ v7 c* }8 P+ b7 I
set energy energy - 1: {6 B' h* p2 c& J/ X8 D" {+ K K
]3 O4 g6 o6 e6 I& I# S1 `
end" s: g' W9 S# c/ {' N
to setup-patches7 C' d6 d- k/ Z# e
ask patches [ set pcolor green ]) }, d0 k+ Q# U# {
end
/ ^* ^- S6 j# u6 T% Y; ato setup-turtles
( ]! \7 D5 e5 a( F create-turtles 100' }3 n: u: c/ M3 y
ask turtles [ setxy random-xcor random-ycor ]
% v% l. Y$ W4 p* Yend
; D& z, m: ?2 jto eat-grass8 h% r# e9 ?6 }7 d7 ?3 I
ask turtles [
: P6 J0 V( A t* |: c6 ]9 ~ if pcolor = green [
; \, W* t. Z; q/ e" k; ] set pcolor black5 F; Y0 E' H! N# p$ }8 E
set energy (energy + 10)/ x/ {6 U# L" A3 l# f
]
1 D$ H! j8 }# v+ B9 q ifelse show-energy?
$ w& @4 Y& \: w( D2 X+ X- }- ` [ set label energy ]" V$ e9 f7 U9 z( K& k/ H
[ set label "" ]
% ^; f" A2 @ E# p* S- s! R ]
: |, G! T6 i w: E- u, \ M aend
0 \4 M' {8 f& m7 V1 S6 sto reproduce
r' r1 M! n: W& L: ~ ask turtles [
: Y- @4 P5 N9 r( f if energy > 50 [
; V. Q2 ] u' o' c set energy energy - 50* C* G* ~* J4 u6 T9 X* [" Y F3 R# ?
hatch 1 [ set energy 50 ], h- }' }' {% t5 y; N3 G% c. i
]
9 e2 }6 w: n* @ ]
* p* s6 U( A7 B x# i2 @9 mend. H1 `, y& _: e: Z1 V6 @
to check-death0 p4 K. V+ U( `. o4 _* J" |6 f
ask turtles [# n+ E& f5 G s5 `
if energy <= 0 [ die ] @$ l* t% E! R. T
]
! Y; e( H6 s* K9 }end; P- S1 c4 x" ^; @7 o/ X
to regrow-grass5 z. Q/ d/ J/ c' a3 W2 m4 i
ask patches [/ \( f) M# E/ l5 a
if random 100 < 3 [ set pcolor green ]* e. o5 X6 }( k3 l1 V+ G
] X+ x# Q5 ]2 O, R' s" m
end
4 o- P" X9 D; F. |$ X9 r6 }to do-plots
$ v) z2 t$ C7 K. F8 |; B& } set-current-plot "Totals"# C) N& k; ?. r9 V. G) _' t
set-current-plot-pen "turtles") F: _ v; l& c4 f) c1 @
plot count turtles2 i% s/ x% B0 n
set-current-plot-pen "grass"" n, h- ^& T. R( j
plot count patches with [pcolor = green]
/ ]" j& k7 p& ]. J! [2 Y$ Rend
5 |7 a/ M3 W/ S8 t可是运行时提示no such plot: "Totals"
& c! t3 t' V6 t# t$ L' x! Z! ], L* qerror while observer running SET-CURRENT-PLOT
" f5 N4 G7 e& c1 \* M8 i called by procedure DO-PLOTS
1 f0 U) r$ Y( F6 k% Q called by procedure SETUP$ F3 R* U( X9 f! e3 b) L0 ^( E
called by 按钮 'setup'& @' L& ^0 b* r
求大神解答啊 |