我编的程序如下turtles-own [energy]
' M; P1 A. W/ g' @* tto setup
l$ o X. E( a L& P/ ^ clear-all6 V9 m8 a% x" m+ K; ?
setup-patches
4 ~. c4 m Z# z2 L- u1 K3 \4 r create-turtles 1002 x. l1 U, y" I+ e* J3 I0 k
do-plots ~* n6 a; h+ i
ask turtles [ setxy random-xcor random-ycor ]% C9 z: x! s# G6 s: e
end# E9 }" \+ R% |+ V2 }, m7 r
to go' l) U% m& u) k8 y$ o
move-turtles
; h6 d7 v" M8 {9 k3 Q eat-grass; J- z, m% W4 U* c' X/ W
reproduce
% L: f+ K% s% S1 p# [8 v check-death5 N) r) \ j0 a1 {3 m
regrow-grass
3 d0 K- g+ }' ~* T do-plots1 ^: A4 {+ V! p" j7 \
end
2 O9 K& n+ I4 p+ ]& T* Gto move-turtles ~( P& I$ M4 H2 v4 R: z
ask turtles [
; [1 o! u( X- |! V, Y9 b right random 360* A1 l3 B' K1 h" p/ p% D9 U+ N
forward 1, K+ Z: F% @3 h
set energy energy - 1
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( s" `. a1 @% ?* z" A* h( zend+ h$ G# K5 R* ?2 P0 c
to setup-patches
8 U; c9 L- i+ J1 e& r3 T4 _" r* y ask patches [ set pcolor green ]( r4 {4 ~6 N. E/ m4 r
end/ H: P3 V" z" }1 ~2 C- H7 c5 |
to setup-turtles
5 @1 V- |: Y! g create-turtles 1005 W7 R! H0 A* p" Y" a) Y+ J1 D
ask turtles [ setxy random-xcor random-ycor ]
; E- h2 J& ~. b" P; t& I9 h# `/ ^6 eend8 {; t/ Y' w( J
to eat-grass
, u6 j9 f7 k2 o q8 E6 p ask turtles [+ O& W# V" C: y3 [, r
if pcolor = green [& y+ S, u {. H4 w/ `* {& ~
set pcolor black
: W5 {* `; ]$ @1 O% F! P0 l& [ set energy (energy + 10)
4 N& K( u& |, ^5 F$ Z ]
3 |- s9 b% Z: X, z ifelse show-energy?8 J9 {: Y4 q9 Q& A
[ set label energy ]& h7 M8 T3 _! o$ o
[ set label "" ]
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end
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ask turtles [# d4 ? ?# A5 e. }5 @- i: L
if energy > 50 [
( @' Z- G) j6 _/ i) t5 G! O2 t set energy energy - 50
9 }; r- L( N. H/ A; x2 P2 B hatch 1 [ set energy 50 ]
6 p2 g2 Q P. N) z1 b ]* Z% p5 J/ [" Y4 o* \
]
' j" V4 j6 Q1 c! pend$ X4 q6 V5 c0 _7 p0 k) A5 _+ M9 G
to check-death0 ?0 e5 k5 A0 g# k, N$ m
ask turtles [
4 P% t+ K# E- o6 C0 |) x6 t6 U# Z if energy <= 0 [ die ]9 I+ z8 }7 _' s5 _' @3 j
]
7 h4 o" }/ U, Z8 x2 Q8 M8 w, tend
* K6 ~% n! b& ^$ a1 u& c+ t/ ]/ sto regrow-grass
$ t: { [( {3 ~* h* N6 a ask patches [
, j5 V9 g& q+ p) y4 ?0 E if random 100 < 3 [ set pcolor green ]
6 l6 L& h( {5 {- Q ]
5 J$ f: T! i2 Y, `4 v, J) l/ Yend
- d$ z% R5 |1 c7 x& P ^to do-plots
2 Y5 a% W4 Z4 T set-current-plot "Totals" T5 ~! t0 Q o1 r; \1 p9 c
set-current-plot-pen "turtles"
[: j3 g6 U C( S$ l+ z plot count turtles
% [; q: P( r: f set-current-plot-pen "grass"
3 R' @4 p7 @! j2 N plot count patches with [pcolor = green]! }, n5 y5 ~2 N+ {5 F; n. X9 \
end
6 f$ e3 r. y; w可是运行时提示no such plot: "Totals"
B8 v3 d' b8 d$ _9 B Herror while observer running SET-CURRENT-PLOT7 @$ F; `) Z" ]. ~8 F
called by procedure DO-PLOTS
# `7 t& X9 g" k* F5 D V; K' T2 k2 H called by procedure SETUP! F# r$ W/ ~; y
called by 按钮 'setup'
: k) L+ H% ~; h3 W2 U- f. u3 y求大神解答啊 |