我编的程序如下turtles-own [energy]
! R4 i$ h |+ s2 r- Q/ j$ |to setup5 |7 J# v, ~3 e7 g
clear-all
! i2 W% g1 O/ ?+ F; D& E setup-patches
: q" O0 L6 o7 r% l4 v create-turtles 100
`2 D3 n; G# c" Y+ w do-plots
1 x5 K$ n7 l/ U% B( _$ K1 [5 m4 m ask turtles [ setxy random-xcor random-ycor ]
; d- H* o5 b" }9 b$ ^( cend
4 P& f8 [/ S$ f% M8 C$ b" V$ \to go
# D& Y+ R- x" v" y3 N( i0 V. l6 e move-turtles
+ x1 f `5 n" N( K eat-grass
( x: ~, u, Z, g7 O reproduce
: h1 f) ^7 s: x' j check-death
9 K4 w; j8 [- F+ w' m" y* g regrow-grass8 t1 T2 E3 m' w+ P3 H
do-plots' y5 h* n: M# Q( i- e; o' O
end: k- \# w; U( _5 H
to move-turtles
2 `7 ]1 E; [. Q$ j0 o9 H ask turtles [
9 W4 W1 L7 ^$ C& x. e* X. O/ j* r right random 360
/ u9 t7 X2 K3 y9 c) w* j forward 1! i/ @- S5 Z1 X9 P0 T6 C3 M
set energy energy - 1
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end: C/ p8 J& I' @* ~+ O
to setup-patches' O5 ~+ R; A. s
ask patches [ set pcolor green ]
8 \ i" g; G$ J: V" oend
5 x+ W- {% y8 _" t w( |3 I& x! Nto setup-turtles7 |. ]1 A% ?- A+ V9 B
create-turtles 100
( T' Z. M+ V; k, C( d3 i5 h ask turtles [ setxy random-xcor random-ycor ]
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to eat-grass
( J$ [' y" d# L% j7 H4 m ask turtles [
/ Q( E, S2 B* U, t if pcolor = green [
" \3 U2 [' M- t) w set pcolor black
' K* s% p( U5 \9 Q set energy (energy + 10)
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ifelse show-energy?
1 P! [' c& V$ n8 c5 r, \/ W! V [ set label energy ]; g( u- D5 Y+ {
[ set label "" ]
# {0 ?3 b1 F2 r) p7 q ]
4 \& B" }" e+ r; R5 ]end4 T+ W& I% [3 m1 L. J/ e
to reproduce
$ a5 T0 u8 ^4 q& w+ { ask turtles [
+ `. t! I. b' b& J# } if energy > 50 [/ @+ I2 M, _# u* d8 z
set energy energy - 50
6 o2 o5 n+ ]/ V" x# d hatch 1 [ set energy 50 ]
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]
, W! f3 ~% W) R$ r. K/ M+ Iend
! q" R) n6 k+ ?. V/ {* jto check-death
6 A2 {( G2 i5 _- s7 z8 ~" _ ask turtles [
! U9 N1 B- p f7 p5 r. T" y; T if energy <= 0 [ die ]: v4 ?$ R) n( X" R: F9 U
]1 v% K4 ^/ Q, ?2 Q% G- y+ N8 C( i
end
v Z. u8 G; Mto regrow-grass
: o" w; ]1 o9 Q8 b% L ask patches [3 Y# t+ m" b. w1 b i
if random 100 < 3 [ set pcolor green ]
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end
* {# i' ~0 j. m) Kto do-plots& `. {$ b/ D6 V
set-current-plot "Totals"% N0 n9 n* j }6 G2 m
set-current-plot-pen "turtles"
% @: q4 a2 j. m% {8 t `1 z# r8 K2 m plot count turtles6 J1 F6 E8 D/ S; C" f8 _ T& A
set-current-plot-pen "grass"
+ j- P' h4 ]# x6 S2 e: \* M plot count patches with [pcolor = green]
0 i1 e$ ?+ G& ], R' |end
( Y1 P- J, r% m$ q: n, {* E可是运行时提示no such plot: "Totals"
; ~4 y( c6 y8 b3 b8 {error while observer running SET-CURRENT-PLOT
1 h5 `: H$ b7 ^, p; i called by procedure DO-PLOTS
1 @& `* ^8 z# U) q called by procedure SETUP! d; E3 a# d* \( I1 z% i! h
called by 按钮 'setup'1 L$ x! d/ F9 i2 w9 ^4 U
求大神解答啊 |