我编的程序如下turtles-own [energy] D t c* z# h
to setup
, {5 l7 P2 Y! g clear-all0 m1 ^/ `$ H0 y: B3 K6 c; U
setup-patches
# R$ C9 ^0 @* [/ @ create-turtles 100% \2 V( ^0 X8 A* L+ r7 ^& K" B" U. R+ c
do-plots
) w$ G7 l8 J1 o/ _' @ ask turtles [ setxy random-xcor random-ycor ]8 h; ]" \/ L! \$ L2 x6 A, Y
end
( G2 t0 t. ^5 @& R: Uto go
: b5 `7 y7 T! h1 c move-turtles
" ^0 f! I% q3 s# D4 u' | eat-grass
) U# a5 f1 w) L8 k( O) k reproduce
% R; k; E7 g/ b* u+ [ check-death1 u t7 z" [0 B, y
regrow-grass7 D, m# B+ {( |: O$ Z
do-plots
* [& L; X( N! z F8 A7 L+ w! Iend# J1 y) o: r& \5 t
to move-turtles$ `* \$ l: z6 K1 R# \
ask turtles [
v9 {. x+ K( ?# G9 T) Z right random 360% |9 B( E6 c1 i* n' Z0 o! X9 m
forward 1
3 d4 ]3 d! v: d# M+ ~ set energy energy - 16 g+ d4 N) {0 p
]
2 y, p x4 m5 d" _. c; Tend
) K# I3 ^* p9 \" u9 j) _1 tto setup-patches
' h; C. n8 D& C9 X% a) O2 e ask patches [ set pcolor green ]3 g% `6 r. x/ a. v4 C! H
end0 b% n0 g' y# v2 ` z9 f" ]
to setup-turtles
3 Y) d2 @ M5 j5 ^3 y& ?, J. ` create-turtles 100
+ `. O% V' l0 `4 a5 Y6 S ask turtles [ setxy random-xcor random-ycor ]
7 w/ p K! E( Jend
! k+ M7 ?' [0 U1 ~to eat-grass" b% n" ?6 I( O/ S: [9 \# L; D. U
ask turtles [/ B) R& S% X. Y9 ]; ?" E
if pcolor = green [
) E/ z8 X) j7 i" o1 p: U' |# Y" W9 c set pcolor black: q- |' E' Y- \* Y+ e
set energy (energy + 10)
) ~; k( S9 B, }; X" p1 I0 c4 N ]
# O$ m* P$ B$ c& |1 J3 |1 } ifelse show-energy?
) R% l3 ^+ T0 q+ |8 b- \' L5 C [ set label energy ]
?. \7 g) t! I7 s [ set label "" ] Y7 N a# I, S0 X E/ \, U; F
]
' |' S2 a, n3 Qend
9 j$ n2 o% H7 U7 g! ato reproduce2 s/ j# r- S0 N5 ^7 C- b
ask turtles [
6 T6 b, O' G# z* m/ v1 m if energy > 50 [7 L/ k3 S0 a9 ^; p6 h; z
set energy energy - 50
" d" z' ~# U: j |* s$ }' ~ hatch 1 [ set energy 50 ]/ B' L, G. K( X, s
]" b. w# X$ I: W5 w
]
8 o: [6 P: B. S2 mend
2 F& v+ z2 c. T9 }' {to check-death
4 v, `, h" x+ ]( j- q, E7 | ask turtles [$ G" F1 p" U4 d4 m) l
if energy <= 0 [ die ]: n% q; G0 J) k& L% Z5 [. s9 w
]% L! _2 i7 [5 i# K3 z- h
end
7 w' p& |8 ]9 X6 F3 X, O7 `to regrow-grass
" e$ [4 g& T# f* X ask patches [0 ]* `9 Z6 B/ J0 r$ m8 [
if random 100 < 3 [ set pcolor green ]& n" B0 o+ y7 u6 k
]
8 g0 ?: n( H+ I) W( V. lend9 M1 i. F6 Z* M u1 h7 [& }/ t; T
to do-plots6 h& u: [/ F' i4 ?
set-current-plot "Totals"% D4 [6 F/ r ~
set-current-plot-pen "turtles"# e. \, V" W, f" o, c' s( Z, c
plot count turtles
7 J U( Q, _$ x) Z% I3 [ set-current-plot-pen "grass") j6 j, }8 r ?9 G
plot count patches with [pcolor = green]; |1 j; k- |2 T& t. \7 R7 h* ?
end1 K( e- m, N/ w9 a! X: l" y; E( \
可是运行时提示no such plot: "Totals"
+ [& ^4 b, B# t/ [) Kerror while observer running SET-CURRENT-PLOT
# ?1 K& L4 [# ` called by procedure DO-PLOTS/ P5 s" ?- |0 A3 {& c/ ~
called by procedure SETUP
% }$ K7 u8 Q/ {9 i/ C called by 按钮 'setup'( s$ V2 Q J& j0 E! b" e- d
求大神解答啊 |