我编的程序如下turtles-own [energy]
+ `9 v; H* y2 h* L' c4 Fto setup3 Z& O! j/ R6 [7 d
clear-all+ e0 l" f8 m" t8 D# u" o
setup-patches7 t, p; D2 D( k9 @' E" @) R
create-turtles 100
( Y+ D9 r0 `% F7 C8 y+ p do-plots B2 M6 F0 T g0 }, d6 b
ask turtles [ setxy random-xcor random-ycor ]
& m& b! ^1 V5 O3 Rend
4 l3 O7 F$ O e& d& y$ kto go
3 R3 l2 Y% l+ F move-turtles; j: A- V8 f4 k1 N$ j2 t
eat-grass
6 f* r& a! F% u% u. P reproduce
7 T- f) m) L6 R9 K# T check-death3 O( r5 v* C( ^' x3 S5 F2 S) Z# C
regrow-grass
/ _7 |1 L# s0 x# F do-plots
# t4 Z2 U& X) `& `! j7 Jend) n; j# c! q( O
to move-turtles+ O$ O# X. k8 z
ask turtles [
" w+ A/ ^ _9 d8 m right random 360
: D/ ]5 P. N: J% X8 N forward 1
}1 | q( B$ D$ w) g% O" ~ set energy energy - 1# G9 a4 l+ I# q& h
]3 T6 ?* [" x$ v, y. g) b
end3 r( H b( {' c8 V
to setup-patches4 a/ f# U" T" V; e! R9 _
ask patches [ set pcolor green ]! W' P7 x4 l, K" m6 }
end$ j& J. [) q3 V
to setup-turtles
# n( f. C1 A' I2 j$ Q T; C create-turtles 100* [% ?. b. {1 H4 M/ ^- G
ask turtles [ setxy random-xcor random-ycor ]
9 r/ \: ?6 P6 G8 g# U/ jend
/ e6 T4 Y2 q* F9 gto eat-grass5 J2 Z, O( }. n
ask turtles [
, B/ r( t' a. R; s- F2 _" T if pcolor = green [
) Y9 ?: G. L( \7 k4 g. u set pcolor black1 V+ V& t9 M9 S4 `5 F
set energy (energy + 10)
) m: a9 q k/ u# @) O, h ]
4 l/ p9 C4 u9 \% d ifelse show-energy?
! M+ k# I7 x5 Z0 A* ?; P' M* n+ K [ set label energy ]( d8 C3 y0 D2 t+ T! v
[ set label "" ]4 B) Q2 H W0 w* b$ Q) w: s# a
]
) p) h9 ?7 Z/ Z6 t+ Tend
8 h0 S5 X& S- H1 b' G- qto reproduce9 _! n7 f! E# n- t: X2 o% x
ask turtles [
$ ^+ q8 |$ I# _! z* x& F8 g if energy > 50 [( ]- R2 {( f! I( y& @8 Q" ?" n* y
set energy energy - 50
) i& A ? W' i' r v hatch 1 [ set energy 50 ]
8 T# h a' {- S( B# Z ]
7 d4 H, ?' \! s: h( A% e ]
/ ?. ^" t( T1 ]# R1 D" ?end
4 h; s. m4 V$ v! e3 X$ xto check-death
: ?* Z8 C' _% I8 }' `( Y) p ask turtles [2 u: f( L R3 o- \7 d
if energy <= 0 [ die ]! L4 ~ O5 k% b9 c2 U3 [; W
]) X/ d- C" _( K- s7 ]+ B* v* Q: X
end! n7 U+ ?# e2 A$ k. P3 y3 O
to regrow-grass
R& Q* K0 Q8 ?! ~0 A6 V ask patches [
- Y: w' ] h3 L( X if random 100 < 3 [ set pcolor green ]: d h. n! z2 U
]6 t" s7 b' L! Y/ u) {% F* C
end2 Y2 ^1 a# v+ v5 N9 S* i/ e
to do-plots; c7 ^5 g- G6 n: a
set-current-plot "Totals"0 |6 X% ~- v4 J' I: X( C9 z5 v
set-current-plot-pen "turtles"
, G7 i) ` ]/ a3 Q& t7 I plot count turtles
$ b" L+ x6 [" o5 \* l( Y! s set-current-plot-pen "grass"
6 q! E+ c i \' Z* g8 [$ h. W plot count patches with [pcolor = green]
$ u) \% o* w$ T8 C% Eend4 {% k. ]$ g' Z( ?
可是运行时提示no such plot: "Totals"
& P% i2 n& f" X6 [3 P" Kerror while observer running SET-CURRENT-PLOT
( S7 D5 `) }0 @0 I* h1 f3 b5 r called by procedure DO-PLOTS d: M3 ^3 q' V' ?# d' s3 B& |
called by procedure SETUP/ t; C; J, e( b! w0 d2 Z# G. U0 b) f4 F
called by 按钮 'setup'
) x, M1 f' N6 R; i( l0 z [' U+ x( v求大神解答啊 |