我编的程序如下turtles-own [energy]3 p/ n2 e# k! M+ d/ L1 [ s
to setup
$ f& Q+ V8 P9 ]4 Z, a9 m clear-all
' A1 c1 M5 N; \( ?; L+ r setup-patches
1 v' F' V$ ]* _; E4 q5 b create-turtles 1004 C3 X. O! j% s; ?8 N) j# ?* g
do-plots
. ^. c' v# T2 Z7 N) m ask turtles [ setxy random-xcor random-ycor ]
: t* t9 |" c, P* Mend5 {% n3 G6 R% b8 h0 g
to go- z6 S! ?! M, [. p- h7 n
move-turtles; T9 e, z1 N. [0 D
eat-grass' M6 u0 E: Z7 U) C5 L( u
reproduce3 B6 [7 P" y( D% o& u7 Z+ B
check-death# I. p4 k* [' N; a+ [% J/ [
regrow-grass
8 `( e$ }7 O+ t# ?# x9 e% M6 ^7 u do-plots- h! X( K# K1 s# F: P/ T
end2 A6 [5 ?4 S! h2 ^
to move-turtles
- l3 W# T8 T$ p, A2 ]" N ask turtles [
u4 e( q2 x, Y- V5 w7 w right random 360
_" T3 D: j1 `. [/ z9 }" Y forward 1- Q2 s1 V& K/ D W9 S: w% X% r
set energy energy - 1
+ M2 Z/ J+ \" T3 I. r. n# S ]
) V2 t2 I- { V6 a5 n+ H' dend( {) M N2 _0 H2 u/ H: r
to setup-patches; x! t0 U% ]5 g+ ^/ y
ask patches [ set pcolor green ]
7 ?1 k3 I1 V( A$ R8 n$ M$ Uend/ r. m1 Z, b: L a/ X& N
to setup-turtles q) a8 _: _. ?
create-turtles 100
4 p, I, {) |1 i' i# \; c$ G7 \ ask turtles [ setxy random-xcor random-ycor ]
% h; C/ j! q) U3 X2 {/ s; e" ]1 Mend
8 y: b" G2 B2 o2 l0 }to eat-grass
( D u$ S$ t9 P! ~( ~: q ask turtles [
: l9 @: l7 B- Z5 t if pcolor = green [5 z9 C/ t% t' _. @# S" @
set pcolor black$ ^) q- Q" K1 N4 _+ ?
set energy (energy + 10)7 C/ ]4 P5 q [9 m2 Q
]0 }. V# `) ~$ l5 J% @- B
ifelse show-energy?) ~: k, A) O8 n) a
[ set label energy ]
2 r5 B) k C. }7 X, g [ set label "" ]
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end4 b" \$ p) R" D: f9 D8 e! \
to reproduce4 B; w) c# @' d) p
ask turtles [
& \& s( x5 j, B& x. ] G* t" a% x if energy > 50 [; f: M1 i: P- G
set energy energy - 50
1 x* t: Q( k' }( v( r/ g, Q/ b hatch 1 [ set energy 50 ]
6 ^1 S8 X+ M- Z ]4 u% w# g% R& B! I7 f9 {5 o p. U
]
. I9 g) W( @+ y# W+ S# N8 w8 Xend2 I: g! ` F/ a3 s
to check-death& r. _) x) z h6 h1 |
ask turtles [
9 T! ~( y7 b b if energy <= 0 [ die ], L; Z M$ M5 @% |* f$ M, r$ D2 O
]
! j4 T; [, l" t) Tend0 x# M+ w( V' z% K* o' v
to regrow-grass# T( D2 ?; k# c+ ~
ask patches [
2 C4 c- [! {4 ~ if random 100 < 3 [ set pcolor green ]
- w7 \# J- ?7 h+ _ y8 `' M ]
# p, l( i" {. o5 G9 A3 t: f0 ^# x2 `end
- A' }3 C" M" T- ?; Hto do-plots
, a4 L- C$ k5 e: @- j1 b- j' `# ? set-current-plot "Totals"3 o% a$ D0 c8 j6 e q
set-current-plot-pen "turtles"0 T" u. f! D8 |+ \* m6 v& b1 T0 E
plot count turtles
8 v' [/ Q8 n, o* O' Q set-current-plot-pen "grass"- |( @+ I7 l6 r! K. I
plot count patches with [pcolor = green]
7 W, R2 t4 o2 R9 Nend: V: a0 k: p# a0 [' K# N
可是运行时提示no such plot: "Totals"
5 T/ {8 B6 t- G3 [; t2 [error while observer running SET-CURRENT-PLOT
, a+ R( m( O5 j0 V7 | called by procedure DO-PLOTS, @) |' V% R7 Z( r2 k3 r
called by procedure SETUP. p& j" d& c/ J3 {
called by 按钮 'setup'# o, O! X, ~8 T1 t
求大神解答啊 |