我编的程序如下turtles-own [energy]
: v$ k+ G( I7 L4 E9 ~3 j( R! zto setup
' h+ {8 N( {+ D* | clear-all) z" ^% d3 C0 Y1 n9 L/ ?' Z
setup-patches
3 v; F1 z- S, J: e7 [. z create-turtles 100
7 f7 g- K9 c2 i/ B! v: P do-plots
7 p, V/ J6 s. h$ U6 T ask turtles [ setxy random-xcor random-ycor ]! O- s( p5 h# e3 N/ n; i1 I
end5 t( e# s2 a6 Q3 @$ I4 _2 [7 F
to go
' |- _' a1 B" p A' C2 [% e move-turtles2 D, m8 S" S" W6 b; E
eat-grass
, }2 V& Z. A+ B- N: O. Q C" Y reproduce
) [" |0 Q# T" d, N$ F! H4 O check-death
$ \) m" }- D. B8 X regrow-grass
1 [6 D; r x) S9 y do-plots
6 p7 A3 u, U% h, p' m8 I/ mend
! J F$ `% R8 r3 v9 {" S' P" Kto move-turtles
8 B3 O' V! G7 W7 [5 m ask turtles [
9 i3 x- C$ d7 J; y; B right random 360
& h D( M4 p3 ~5 z forward 1. j4 T# i1 |6 Y! e
set energy energy - 1
. v) e5 C k0 C" v# k* b0 L ]
, B! f1 o3 g0 [8 u0 |4 cend
' q% T0 W" ^ D4 e) ~6 Fto setup-patches0 A& P6 E6 \7 ?% \; n
ask patches [ set pcolor green ]
+ y2 ^1 o- I" V) S1 t/ K7 ^* Rend
6 B, u- K! q5 j. _to setup-turtles
' Q7 I! U) [/ j6 p create-turtles 100# i7 K7 j @$ H5 ?. }. O. ?4 x
ask turtles [ setxy random-xcor random-ycor ]( B6 h" V+ t5 k" ^2 c" A9 U
end
, S" f! L$ R3 d; xto eat-grass; J( P* |7 b X. I' P; l( t
ask turtles [2 a% M+ F4 b3 V+ J9 J
if pcolor = green [7 e! U n' r& y) z3 v
set pcolor black
b$ e; P1 m r& y# Z0 a) o set energy (energy + 10)
( ^5 R6 L, q5 K ]
, I& K+ B$ J) d- \) H& n ifelse show-energy?
' H* d6 w# s4 i8 D' f0 } ^ [ set label energy ]
8 u; V; Z0 q/ W4 Z& j0 F0 A$ _ [ set label "" ]
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end
0 {# L% ^5 a8 I: jto reproduce# O$ N2 I8 x, c5 r- D* b
ask turtles [
2 ~0 j4 g1 t+ c& ~ if energy > 50 [' u- v. S6 J! ?0 u9 W$ C8 r
set energy energy - 50
0 h ~0 Y( B2 X% [, ` hatch 1 [ set energy 50 ]6 D! p, O5 G R6 ~
]
8 ^2 c* g! y% ^* @! R9 q ]
1 e6 x/ Q& g# ]: F* u: }end
: o6 @ h& a8 }/ P8 wto check-death
: U" V' i& C5 L3 S5 f. J @ ask turtles [6 S1 o% \9 e+ n
if energy <= 0 [ die ]
/ F# R* u1 T# I& c6 O/ ]6 b& V/ |* f ]* z' s' S, E9 X% H' p5 v
end* i6 u7 q( C G
to regrow-grass" l2 D6 `6 H e" t- r q% S& y
ask patches [0 \! D$ C" q/ V
if random 100 < 3 [ set pcolor green ]: f1 I% h% D) i* X4 s
], e, \' Z! ^7 S. E- c
end7 ~; j% W- ]" u% ^" s. j
to do-plots0 ^7 V8 i7 R1 @: N2 q$ m0 ~' u
set-current-plot "Totals"- W( ~, {* c5 }% M* `
set-current-plot-pen "turtles"4 L5 L$ p3 A, C7 v5 {/ e
plot count turtles
) N7 w' X2 b* B set-current-plot-pen "grass"
7 ~5 a7 H/ c2 _: r' g! _, V plot count patches with [pcolor = green]
6 D3 o+ B% N- r- @( E* i! ^& Zend* f' `9 H6 H( H9 _0 h N% N* w
可是运行时提示no such plot: "Totals"
3 y9 E5 W) g4 E, @error while observer running SET-CURRENT-PLOT, ]! C( y- ~& Z6 B/ S$ j0 B, z% M/ O
called by procedure DO-PLOTS
; ?& `3 G$ P {, c4 I called by procedure SETUP# ]: U5 G8 C9 S: j6 w
called by 按钮 'setup'
$ R/ ^. R% R5 P1 g- s' n! I求大神解答啊 |