我编的程序如下turtles-own [energy]/ V7 l% L" ~, E+ m# X5 ?; k! i w
to setup) u, f0 m$ s. j0 b/ i B, D# n
clear-all/ k% i2 Q& y8 P
setup-patches# Z2 F: \8 r$ X2 B
create-turtles 100- J* ~% f+ U$ i7 q3 ]3 f$ L$ w
do-plots8 j* W$ P+ b1 z
ask turtles [ setxy random-xcor random-ycor ]. C! C; R/ C7 u* q$ N
end1 I7 f' g1 @: r
to go
" D3 d/ E) t0 h0 N2 c5 D move-turtles Q$ q& `. ?* d9 B3 w) _
eat-grass
! T# m8 ?/ f: {; B2 o. z" j reproduce
0 x! W0 g, Y. Y3 m7 S+ M6 X check-death
* S+ ]* O# H. E1 e% Q& b! S regrow-grass6 i; k1 W, G( h7 }+ o$ L/ v( ]
do-plots8 u2 o! c' h& }- _- l
end
- h% `# H& X7 ~! hto move-turtles( J. |7 U C8 v4 q, R' H/ c
ask turtles [* o4 d# I# @8 @8 u
right random 360
6 ]+ @6 e( i6 a6 y forward 13 p/ L; N2 g' @. ]
set energy energy - 1
) w7 ^ A7 z0 c# K- L ]
6 N+ V2 r7 o* o5 M8 F% ]( U( ?end3 _4 b) V- K0 ^
to setup-patches
* f+ L0 b' w1 I4 n& s9 q ask patches [ set pcolor green ], r M, `' m k% n: z# [+ L
end
. P& h, |+ m* ^1 \- ]to setup-turtles# V& ^ b& r. ]3 J) h6 C
create-turtles 100
7 w. t2 m( A. {& ]5 U! n ask turtles [ setxy random-xcor random-ycor ]
- J B) `" N9 e( \% N' hend
" q: F% g" y8 u2 Z3 Vto eat-grass) |- w2 B$ E+ C" d8 @1 q! Y0 @# K
ask turtles [: u, @; o8 X1 T3 T5 ~
if pcolor = green [
& Y0 N8 ?" u) h9 { set pcolor black
$ |. b8 M8 ^ U' }% x set energy (energy + 10)
" P9 i# w5 V! x" l; i2 o* m7 r ]0 \: @5 N, c- X+ x' u+ H
ifelse show-energy?
5 j- o+ S# m |) N [ set label energy ]4 J- v' e3 r R0 }1 G8 U" C
[ set label "" ]
9 [4 `- m" B- p& q- E2 T ] Y! N( `7 B$ G' K* h5 v# K' ?
end
3 O2 _4 u" K; Yto reproduce
2 c! I* g1 B% S8 \2 y, A1 Z0 x ask turtles [" e4 v" n/ \8 V; o
if energy > 50 [
) j/ x2 Q/ w6 @( w4 m! G% h set energy energy - 50) D* p5 D1 c2 J- B# J6 n; F8 r! W
hatch 1 [ set energy 50 ]
& s% Y& P) `* Z$ y' k" L9 q- V ]7 k" A* f$ B. \7 k
]
3 a0 V K% v4 G) }) {( tend x& }3 q* f8 H5 f; k+ t
to check-death
2 p) j. [# x% \/ y5 p7 X" w ask turtles [& q4 }& K. F4 B( T# v
if energy <= 0 [ die ]
9 s/ I9 ~0 w. B6 ~ N ]
2 ]) K, `7 c( ]2 eend
& h# _& N- \( B5 \to regrow-grass( u4 C E8 B% A* m) u' M" e7 y
ask patches [
7 o) p8 w; d- I3 }3 ~& p; y if random 100 < 3 [ set pcolor green ]' r; F9 r% R& P1 U
]% R! ?6 o4 D- d% s
end& [5 j4 \5 V3 l: |
to do-plots
6 @& k/ W. Z* b1 N% w7 u set-current-plot "Totals"6 s8 X6 }& b+ @- \- `
set-current-plot-pen "turtles"- @! N6 l+ F! O0 ~
plot count turtles
1 S4 V& P- a" O4 S5 N set-current-plot-pen "grass"6 t# A/ H* J9 d, _ K
plot count patches with [pcolor = green]
2 ~) w; ]% R; ~0 E7 I" \: J7 Wend- U f: J& i% ^$ X9 l
可是运行时提示no such plot: "Totals"
! i7 q5 K5 U* |+ W+ X9 T$ t7 n# [5 Oerror while observer running SET-CURRENT-PLOT
3 P6 O% {; e6 ^: T called by procedure DO-PLOTS
! P {" r& ?/ P called by procedure SETUP
; C$ e% E" b o9 q0 ^ called by 按钮 'setup'3 M) [ K/ H! ?6 F
求大神解答啊 |