我编的程序如下turtles-own [energy]) j2 P' [9 L! `9 m
to setup
0 D& ^7 @2 I( H6 d& f4 T clear-all
& J$ B% r# v2 Z" f% G* T setup-patches
- L% |$ n( @) r9 S' V" t5 ]$ a create-turtles 100# H1 q+ Z; O* a- G0 w# t; d
do-plots
% \' e* ]% F# Y* n8 J( P ask turtles [ setxy random-xcor random-ycor ]9 I4 i# s! R3 z7 l
end! k3 E- o' y( q3 n. m
to go4 ^+ \) G8 L, i& {7 v* W
move-turtles
4 G& ~$ m1 W& I" d* ?$ c" f# o2 u& X eat-grass/ i2 b. A# S$ b" W% h
reproduce0 f. ]8 j0 M7 `/ B$ |
check-death
9 l5 a" T, I% i+ [. Z0 _5 c regrow-grass
" g' G6 U. T! C2 d. C. Q8 c do-plots
0 X/ B& Q- b7 [, H0 Z, bend' j, l: v. o! M7 G/ t
to move-turtles
4 i+ n D$ Q7 e, l ask turtles [
% c4 J5 ~& \- x* U! e4 Z( S4 c right random 360
- e4 z& m4 W7 D# x forward 1: I' P1 G; ?3 c4 r) k
set energy energy - 1/ ]1 J9 H8 Z( l/ K
]
. ]/ _5 O3 Z* r( c1 yend
/ y+ }# W* f. {to setup-patches
5 ]9 C [% X) u. u% i) c ask patches [ set pcolor green ]/ } [( G$ e* `7 c: h$ y
end
7 \. ~- J# M7 h8 x6 W0 Lto setup-turtles
3 c2 j) q0 e/ i1 m" w! N% G create-turtles 100+ T6 e2 E+ u0 m' Z4 P/ M; q
ask turtles [ setxy random-xcor random-ycor ]
' X' U: {4 o% c9 y( ?8 D/ Pend# N9 |* _# Q6 M
to eat-grass
# D T( ^" V3 u/ f8 `3 q ask turtles [+ l0 f4 Y6 k- @1 D
if pcolor = green [
. J8 ^2 I3 s0 g- |( c7 y set pcolor black+ [3 k" S+ L9 ^, C' V0 \7 ?
set energy (energy + 10)7 k7 t8 u: Z$ c0 x! r, J& P2 g" g
]
! ^+ y7 b2 Y5 k: t( L6 G. g ifelse show-energy?
2 V6 K ~2 p9 _+ W [ set label energy ]$ k. U& b, ]% b, z+ c
[ set label "" ]
7 S- r' c4 `; W# t$ V ]2 _ h' |) V( a
end8 k: |2 A( B) v" U; @2 F
to reproduce$ Y$ u6 X3 F- B7 c( R7 `- w9 Y$ C% Z C
ask turtles [& M3 Q% H; J- `" P2 Y& T
if energy > 50 [
- k5 o1 r3 a* O set energy energy - 50/ u& H* K( n7 s# {* f
hatch 1 [ set energy 50 ]
0 B, }( h1 \0 Z) n6 A4 h3 S ]1 L7 _1 L: q# O, Y5 p/ F# k/ f
]. a2 J# B4 _7 j' h8 {' R
end! R/ X. H+ [( L1 L
to check-death% R% {' F; V& ~ X
ask turtles [% G* C @' r; ] [9 O/ v/ Z
if energy <= 0 [ die ]. m+ m% m/ F# ^5 c9 ?8 I3 d
]
" p% H5 O& ?8 s* zend
" m" t, X' c( X% X6 Qto regrow-grass
& d1 a* i$ s v9 k+ v ask patches [
. p1 ~ B& w5 J, ^4 }. q if random 100 < 3 [ set pcolor green ]
& O; Q9 L7 g- g2 [( o ]
4 C: }; G- r1 \9 }, I# o8 B, ^end
' b( K6 c' L+ f2 j& \to do-plots+ w5 P% ~. _+ v* x# h
set-current-plot "Totals"9 f7 a% o* D l1 @/ R
set-current-plot-pen "turtles"2 S3 U6 f: T- O1 I# j2 \
plot count turtles
4 H* \; Y& Q2 H8 U" q' ] set-current-plot-pen "grass"
1 N& v, E; U: B9 m plot count patches with [pcolor = green]
4 C. P+ i+ v* N0 `8 f& C4 \end
" ?" ?9 e$ ]3 T( w3 j F可是运行时提示no such plot: "Totals": b6 w8 P6 U' R" v
error while observer running SET-CURRENT-PLOT
5 ?& f8 f: ]" Q! V* z5 F" ?% m called by procedure DO-PLOTS. P, m6 ^* @2 d% J; \8 a' j) D
called by procedure SETUP
: F, I$ I0 D/ L* H3 Y called by 按钮 'setup' n/ X: p8 i2 R7 \! M6 K) r
求大神解答啊 |