我编的程序如下turtles-own [energy]- F9 R5 {0 l- A- r
to setup( l3 P& Y' W/ R
clear-all
3 X9 }" O: L; l6 W/ M1 T. K4 t& e( S setup-patches
4 s+ }0 E/ m9 |- s. f) d( t create-turtles 100
5 b; v" f' H3 \1 z* _, K5 u do-plots& w& s- p. C; q) N A
ask turtles [ setxy random-xcor random-ycor ]
4 D% Z1 W. g: _# ^& Yend( x! v* P% O1 H) }
to go5 {' s5 ]2 `6 K, m
move-turtles# n# e7 N% z* v" |& \2 J
eat-grass
( _2 { p+ V7 v2 m k% T reproduce) p6 O/ z" d6 L( v5 n0 E' X
check-death! A! C$ T% S1 @9 ~
regrow-grass
' G, }4 u+ q* y9 ] do-plots" j: ?- R \- l
end
2 @1 c! L: A2 P) Uto move-turtles# C) i" B. ?% n! g, e
ask turtles [
. q) S+ x: X4 s N) m right random 360" h$ Z/ U! ?' J" Q6 i3 [5 H: x) L
forward 1
5 \- @: j9 f5 V* _3 ], a# Q set energy energy - 1
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end
: J6 B9 \# A1 s+ N# g, mto setup-patches! ^- t: t1 r' Z) t: n
ask patches [ set pcolor green ]& { {+ C3 \ n2 k
end/ L. v' r, {( d8 n$ ^7 O
to setup-turtles
% J; }. \& K# P3 K create-turtles 100 M& F! p0 |# E2 g
ask turtles [ setxy random-xcor random-ycor ]
R4 \" y: c) c9 z9 E( R3 L$ hend
& G; V5 k5 A( x9 A# Y3 h \to eat-grass/ j+ ~) z# C$ [/ B/ `9 r" w1 e
ask turtles [
& Z& w! D! } N8 I( B' m if pcolor = green [% N# u+ \* o) c" Z7 W9 d
set pcolor black
- X% |9 R* C' o; `- l9 ^ set energy (energy + 10)
+ c+ c+ ?* |# r ]+ L- m! i' k/ |% J! b
ifelse show-energy?% k+ c$ ?2 I* d+ @' P
[ set label energy ]$ F8 {8 k2 z$ p' I
[ set label "" ]5 |+ j( ~$ H$ @, Q" P
]
% A$ T4 n8 T4 O# _end6 W' J! H2 B+ C/ n; s" z1 w2 y) o
to reproduce
. c7 [" Q! L) P% L9 f% s ask turtles [9 R0 A( L5 @: G( `+ {& o+ O
if energy > 50 [3 g4 ?- Z/ @7 B9 U2 d8 \$ D
set energy energy - 505 P l. t2 e) R( K
hatch 1 [ set energy 50 ]
; Z0 m, @+ }7 w ]
: U- }# ` z8 {' Z7 r( `+ I% W! C ]# w# `: _) G0 L7 t/ @$ J
end
4 e3 X8 |0 Y$ j' Rto check-death
# U) A' L7 C0 L7 f* `, X- H. \% x ask turtles [
0 g% ]1 M; V1 N7 r- t% P if energy <= 0 [ die ], r7 H- G" f9 |, [$ M& G
]
, U" H- q8 e' ~9 x7 s% P7 K9 r& `3 Eend! `% |- x' e. \9 L: T/ e
to regrow-grass
0 n& t( g& }& q2 y H* r/ v' l ask patches [( \8 I. {7 o' W3 h8 M0 G5 L5 M
if random 100 < 3 [ set pcolor green ]# n6 i( Q" q' t+ @1 ]' d
]
, }' y# ]5 v0 J8 G5 J5 fend
6 {9 \1 n# ~5 `' U$ ]to do-plots, w3 I! l" G; w/ M
set-current-plot "Totals") ]4 T. \4 W6 I0 D1 ]& W3 `. y
set-current-plot-pen "turtles"' p2 G; j7 ?9 z, L: k* G( x' C2 E
plot count turtles* _" i2 u6 d1 ]5 I9 h
set-current-plot-pen "grass"7 `$ \/ Z3 n& b1 G+ P
plot count patches with [pcolor = green]
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可是运行时提示no such plot: "Totals"+ p8 k: I1 U8 [7 y
error while observer running SET-CURRENT-PLOT
1 J0 W) ]( Z3 I/ w/ [, A called by procedure DO-PLOTS" t2 y8 V; L2 B0 n! q
called by procedure SETUP* T v6 {' ?: ^
called by 按钮 'setup'
7 v0 \; O0 d2 [& A* V, J6 v% r% v: V4 t求大神解答啊 |