我编的程序如下turtles-own [energy]
: r! G' B2 w3 V' eto setup
) G3 J& B8 t2 N4 s clear-all
# I! j* I4 t$ v6 ` setup-patches
6 r6 K' |; ?# U create-turtles 100: z5 q& [3 u: u. b' t6 O
do-plots
5 Z6 u/ I1 t! d8 L! L9 o( b ask turtles [ setxy random-xcor random-ycor ]
9 G2 \2 H0 ?- jend# C4 D* _9 |& @+ M$ U$ E D
to go
5 t0 ]0 q% U4 b% D move-turtles
& u( a x6 m1 b( \: G# h y eat-grass# V: s+ S" t, _5 ]% B- H* i
reproduce/ }, d9 k+ b0 s
check-death
, D/ |# i6 _3 Q6 L1 o regrow-grass$ {# V. D- g" C& j4 q% `
do-plots2 K/ S# S F. G( I- S( z
end
$ f, Q3 ~. N5 U2 c6 _' j: v& Y2 fto move-turtles$ o' ^; [' D6 A+ \0 k
ask turtles [
: p6 |7 ]3 |6 ?$ |- Q% Y; S9 [- s right random 360
3 S4 q/ X5 h% u) T( f3 i) h# |& S forward 16 R7 r4 g7 K9 V- A* Y
set energy energy - 15 N8 `4 \$ D7 ~0 I
]
) ?- Q5 ? W: Jend2 z! P/ Y9 N- d. y4 ~5 H) \/ Q
to setup-patches
; O- v+ {, {' d5 q: W* ` ask patches [ set pcolor green ]8 \: d, q" \' N" x$ ^+ Y4 C- ?/ |
end
2 j! M _9 z# {# Q& }! b6 Z$ tto setup-turtles W4 z( b% v( F+ k' j" K9 u
create-turtles 100* I- P( |3 c" w, s9 b, X- L1 T, v
ask turtles [ setxy random-xcor random-ycor ], n; Q4 ]4 p" F( I
end
9 O. m. b( Y2 L% L- e+ v( ?to eat-grass
% `* f9 ?4 n' ~) d5 l ask turtles [
) K* ~9 O& `; @3 I, o: T- F if pcolor = green [
6 f, N8 Z6 k$ D; X, z3 I& j set pcolor black4 r% t1 F- m# Y u$ h8 l' h
set energy (energy + 10)
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ifelse show-energy?
. F2 t3 R1 s0 c4 c3 H [ set label energy ]
! h( G1 d. {! U5 w$ W7 X' l! } [ set label "" ]
* A. p8 p' f8 C, x ]
& e; A/ L3 B- k: s5 V# t5 mend
2 w" e/ |- L: ~7 J1 Gto reproduce
- v2 Z, w- o- d/ Y/ Y ask turtles [
/ X: ]* n; u% H if energy > 50 [! W; s0 m0 ]% D7 C0 H' N; @0 `: [
set energy energy - 50
1 K5 ^3 @5 e" @ hatch 1 [ set energy 50 ]- H6 Q6 d) F' D5 Q: @
]* Q* ]0 c4 c ?* l* |6 B9 q
]/ Q- {; O1 ]0 w( _2 C" ~( a3 o) Z
end& J" L) q+ R/ O; r! o' i# J
to check-death& T3 [% B2 x/ V; E2 d# Z; }
ask turtles [
6 w( f" d; o7 q+ Z9 l: S) j2 v" Y if energy <= 0 [ die ]6 ]) x6 ?' C) \
]
5 ~& Z K8 a: o# _% u- Y; Nend
) [* j; T* y/ n8 s# l7 M, h$ ato regrow-grass7 k3 {0 @" M- [7 {( g. Q
ask patches [8 X3 U& F/ B2 e. r
if random 100 < 3 [ set pcolor green ]: }# ^0 ?8 W9 w! ~* v
]
: a( T) W5 J/ J. W. t! G0 rend0 {1 R3 f- b7 R" Z
to do-plots
: Y' p' K: a7 X0 s( L set-current-plot "Totals". m2 ?) G( x! N- ?2 L9 a
set-current-plot-pen "turtles"
% v* L# l7 s0 o9 Y* D3 j! |, G2 k& X plot count turtles
6 Y. Q5 Y' ~4 g/ {2 I* c0 K; L! S set-current-plot-pen "grass"/ g0 e2 {6 u8 J u( ?; L/ n
plot count patches with [pcolor = green]
7 t8 g* }1 H: p0 S, D yend8 T7 [6 |+ _1 m' A
可是运行时提示no such plot: "Totals"
7 ~; Y- [' @2 O* c+ o- werror while observer running SET-CURRENT-PLOT3 N) e4 d; w+ {: K
called by procedure DO-PLOTS* w' V& t" `" y* U: R
called by procedure SETUP
5 q9 U2 M/ z$ d, T) \3 S* u called by 按钮 'setup'
7 M+ T6 X1 n6 s( Q5 j% a7 U求大神解答啊 |