我编的程序如下turtles-own [energy]
/ D# O# o5 y5 b. N5 ^to setup
3 [! o# e2 M8 C clear-all8 N+ M. ]6 S$ v$ e2 k! J j
setup-patches
, l& k- a6 v7 y2 f$ f! G create-turtles 100
9 Z" z: G) W) I" o7 e j do-plots+ F) A9 C& c& e& {$ m2 [
ask turtles [ setxy random-xcor random-ycor ]) {( N) s( L) q( e, i6 k8 [
end# y6 N; _% }7 r. k
to go
* p/ d2 x" n1 I) s move-turtles; T; }5 _8 O5 n) B4 ^4 U+ p9 d: M7 W
eat-grass
M9 M% c: ^8 Z5 O: Z reproduce+ G; f4 a& h2 u3 Z7 v
check-death
" D/ v4 G6 G9 q9 d2 t! B7 ~; r regrow-grass
- ~6 R6 U0 L3 P1 h8 N# Q do-plots
. W: a' I: d3 ?+ c* I) b* lend% I* i% Z2 j6 J# O' c
to move-turtles/ ?( r, q. Q9 Q! q4 ~
ask turtles [5 E0 }" Q' P& Z& ^0 ^9 q2 F0 t/ E
right random 3602 ~9 _4 v1 L) a$ G: n' W- [
forward 1
' L6 r- \# I; A) d- { v8 N7 G set energy energy - 12 F0 R) W; B& J
]- w& ]: [5 q# M, k' ?' D' W0 _
end. X9 @/ T/ l `% ~3 a2 l7 M
to setup-patches# t2 f2 `+ }# K) F7 r
ask patches [ set pcolor green ]
9 R5 z* _* ~. Q: }end2 h1 \$ [7 a7 ?& l4 x0 p
to setup-turtles5 P: }0 y1 I$ o: n% A! T M2 ^
create-turtles 100
$ L w! R6 \1 `: i; U ask turtles [ setxy random-xcor random-ycor ]
/ W! a) W+ n2 ]0 f+ Lend
7 v9 n" E' @) U4 a0 rto eat-grass
( o! U2 V \* D* t ask turtles [! c3 U; n! G ?
if pcolor = green [ ?. `) z$ u* h: C$ w2 q
set pcolor black
5 U9 M, G' H( x set energy (energy + 10)
8 [2 ]* ]+ J0 H* m+ q9 n* J& H5 A' a ]- z3 }' O) p& W! N
ifelse show-energy?
5 L: w0 [ j. L" C" B8 U+ n0 K3 p, j [ set label energy ]4 V! a' E0 y$ ^' g& v* X% J4 }3 c
[ set label "" ]
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end
A1 w/ ~ P6 H! L) Xto reproduce- ~- f+ C: V9 O7 ]0 r+ A4 @* O
ask turtles [. q [* m* B; J# y7 {3 s
if energy > 50 [
0 H9 v% U: j$ B# d set energy energy - 50
, d$ }+ v4 B* P% l( M hatch 1 [ set energy 50 ]1 C t, f% F% ]' Z$ B$ E
]
8 J& {1 z! ^) D4 q; t5 N+ I; M ]" x0 A3 t' G" [ S$ T0 {0 r
end/ b) V# [2 N) D, }# K
to check-death
, {5 y7 L' I% g' U \ ask turtles [
! R8 ^5 U9 C. r( D& E if energy <= 0 [ die ]
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end9 i* ~7 G! E% j" T. a
to regrow-grass8 z+ J5 }% w4 W
ask patches [
& O0 @1 v( X" T if random 100 < 3 [ set pcolor green ]
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end
( Z* a3 }% C1 L$ ?to do-plots
( F/ p+ n/ @2 L2 T' J5 d6 Q4 w set-current-plot "Totals"5 w# Y' W% b& q; C5 M
set-current-plot-pen "turtles"7 {( {# Q$ f# M$ H3 q p* R
plot count turtles J V7 B5 K/ G' E% u0 s- T" g* _
set-current-plot-pen "grass", k' C5 ], L8 k2 d t
plot count patches with [pcolor = green]" E9 k: J& [/ Z0 D$ |9 s
end/ N$ D1 x- p% J; K" Q
可是运行时提示no such plot: "Totals"% ~0 g/ O3 A; h
error while observer running SET-CURRENT-PLOT
; h+ H! B( x$ ^+ O0 E5 o1 l called by procedure DO-PLOTS
% U- ? y9 f! v5 q* q called by procedure SETUP
1 k4 A: z: L0 e8 D$ p& S4 | called by 按钮 'setup'9 m" {4 ?. C/ Z% A( |9 r" F+ b6 ?" ^
求大神解答啊 |