我编的程序如下turtles-own [energy]7 {+ y( J6 F6 m
to setup
" [6 r- @! k/ l. i3 Y; ?0 k0 C clear-all
+ W5 O6 a8 I: s3 ?1 F+ ]8 G setup-patches3 Q9 s' n: L' k' Y- K
create-turtles 100
" r3 S6 V# W$ T do-plots7 G* ~$ U: u; b2 F; F9 X
ask turtles [ setxy random-xcor random-ycor ]# \# I; `2 W1 [
end9 L h: o) s% O1 q( b/ _% N
to go: K, J; g* E; u1 r$ l; n* ]
move-turtles
$ {: |, L+ Y, n+ F$ A eat-grass8 Y+ g2 s& S% `6 q' I" l: ]9 b* h
reproduce
( Y r. d7 w7 i2 \ check-death
4 L# f- v" @0 V$ k! { regrow-grass
/ y; D$ d3 T3 s3 ~. b) |3 W' F do-plots
5 O6 v7 \& h8 ?' j4 q! e9 y; Aend
9 L5 f" F: a0 Z$ [to move-turtles
! @7 f* z5 Y9 l# B/ \! m5 o$ f ask turtles [! z j3 i3 R, l" _1 i" O
right random 360
- w6 r6 h' Z/ \' x; D forward 1
6 e2 M' }' O. J5 z; H" x$ k; V+ g set energy energy - 1
. n* u# [, q8 d ]
$ P7 V2 x, a" R: bend
% \8 G+ t T6 }7 U) D# Yto setup-patches9 l# B2 X; g: _$ x0 Y
ask patches [ set pcolor green ]
3 C, W% r8 g% C9 fend
2 |: {- Q, t6 I( Bto setup-turtles
' X9 q3 @# Z: S* ]; l create-turtles 100
% P; v. y; U! L$ F1 \# S ask turtles [ setxy random-xcor random-ycor ]" D6 d) J8 s& V
end) g3 t* u7 Q3 z) k
to eat-grass
: d3 d0 ^8 m& V ask turtles [
; _5 `9 G" T) A) q6 G: f) |/ b/ S if pcolor = green [
; `; ]; x5 |4 z6 a set pcolor black
) c& e% I3 m6 I! ^1 [% j set energy (energy + 10)6 _* V2 [5 h3 {. H. U5 T8 `
]
% [1 A7 O: _0 D) V+ W ifelse show-energy?1 k N+ K8 [. J d E8 L
[ set label energy ]
0 R; i: T1 }( g5 P/ E [ set label "" ]/ F" d8 o% v; R" i; v+ V
]
8 f1 E& c4 x8 s/ Yend
( j/ B5 ~, r7 F, \+ _# `2 q+ Ato reproduce; t' \) h# g# Y: K
ask turtles [
4 M7 e' v+ {- o$ g if energy > 50 [
- X. u% d b S8 M* d5 T& l: O set energy energy - 50; _3 v1 Y) U2 B. c9 m- K1 W0 [$ S
hatch 1 [ set energy 50 ]( q( P% g, m+ E
]
8 k* P4 _' B* t0 T9 Y5 Y' [ p: c ]
. N4 F# W# |6 c" i5 Aend
; x5 m+ R; l' n- {5 ?* t/ ^4 kto check-death
2 u' O( V5 |7 b ask turtles [
/ ~8 P; H5 Y( ]" ] if energy <= 0 [ die ]# \5 n T4 K( Q
]- G k9 {* c& z& C# o% I
end
* }6 m6 `" J. R/ E, `( H( f) B+ }to regrow-grass0 Q0 ?3 q$ A- g: D4 g) Z3 I0 k
ask patches [. \& Z' a3 `3 H0 O; L
if random 100 < 3 [ set pcolor green ]
6 V/ ]9 O4 i7 _. k& ?8 s+ _4 S2 N ]
7 |3 r% F, x* M; a% Tend
) y" X9 |9 V7 Q( tto do-plots! M+ x9 h8 a4 R4 m6 T/ a
set-current-plot "Totals"4 Y) Z- B+ \4 V2 m3 H4 b: ]- m
set-current-plot-pen "turtles"
" _% {; x* w4 [4 \0 Q plot count turtles. ~: z9 k0 O1 u! E
set-current-plot-pen "grass"
# X( M( J6 K' G plot count patches with [pcolor = green]" S& O6 A+ F6 y; Y9 \7 A8 ]' X
end
9 V/ q! g# X+ a/ Q" j5 H0 T可是运行时提示no such plot: "Totals"
3 M. k9 `. G( D( Oerror while observer running SET-CURRENT-PLOT
% P$ ^/ M* v4 `+ ^0 i called by procedure DO-PLOTS- T/ S3 M$ |& x" \& G' |
called by procedure SETUP8 y; ]8 i; R" ] [% E0 }8 c9 M o
called by 按钮 'setup'' M9 z' q8 T+ J# S, R$ P7 o
求大神解答啊 |