我编的程序如下turtles-own [energy]+ q S m3 J: X' `1 t
to setup* ^2 v+ d9 m/ _3 K
clear-all! `; g3 o7 l, I" l+ z! x% z
setup-patches4 P; s6 t- Q+ S2 L* B" X- k& F$ s
create-turtles 100
* F" }( h4 l. U4 N& X! H+ y4 t1 o do-plots
1 @8 w4 ]: N* r" O. O1 T ask turtles [ setxy random-xcor random-ycor ]+ e8 O6 \$ l( R' v+ u* Q8 @7 E7 ?; G
end) w! f; G0 G$ i8 S; Z" g2 e9 S f( ^
to go2 o7 t2 i$ j, I- Q
move-turtles9 M T2 H( _' d3 w' W* A
eat-grass
7 K0 o4 z0 S& F' c7 Z# @8 ^9 k reproduce
+ I. J1 g% H0 r check-death4 G; H8 l& Z C6 e+ K" v9 G
regrow-grass
' Q5 }+ L+ O' ] do-plots2 r2 [2 _: a6 e8 F
end) s2 q' {0 V2 t8 B& \% c! n) j
to move-turtles2 r- K* g& }- ?7 M
ask turtles [" M8 p" S1 R3 u4 D7 t+ S
right random 360
% p; V: D7 _4 J( k& G6 W+ k/ e forward 1
/ {- K6 R' }, K# j( z' O/ X* s set energy energy - 1
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end/ l, J' L. r6 C j
to setup-patches
$ f* b! f% Z2 V S8 W, ]2 o, Y9 X; y, M; f ask patches [ set pcolor green ]
# X& [( G, @& ?( Yend
3 s, B9 ^2 p; G4 T& ] e# Sto setup-turtles
O. U9 d' E0 F1 ]5 U. T' C create-turtles 100
( W7 ^( a& e$ y/ J. o0 z0 v5 F: X ask turtles [ setxy random-xcor random-ycor ]' l6 W1 x- J3 d2 O- G* N
end/ d g; d0 Z3 @. x) Y
to eat-grass* c( K# O8 e+ w1 z5 ]! [( v
ask turtles [* G6 P g; U3 ]9 n+ w! D
if pcolor = green [) Z9 Z5 s* `3 R4 C1 D% g/ |
set pcolor black
: a- T" m$ F5 k: C! `5 z set energy (energy + 10); n1 q9 @) n+ n+ R# V! {: a+ i
]
! v8 F- [/ i: [/ m' a ifelse show-energy?
% }1 T+ L9 V! W: v9 f [ set label energy ]
# z+ [, Z& a5 J: n$ G ^/ L [ set label "" ]
; u7 n) O! V# `$ S+ _5 h: m; U ]
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to reproduce! ?0 o8 o- f( n* y
ask turtles [
: N0 x1 n7 j9 g4 \" n+ l3 P# t if energy > 50 [# k( a) p7 I7 L
set energy energy - 508 a3 Z) f# ^! z0 n
hatch 1 [ set energy 50 ]! W( ^6 K+ E6 c9 @+ U, q6 p
]
/ _0 n+ I! E$ E" U& M# m- l8 H ]
# j# ?) \! ? M" u1 bend5 x/ y) z9 Q$ Q0 d
to check-death
/ ?+ C5 d" t3 m _. S$ n ask turtles [
7 u9 m6 p/ Q4 e" T* ~+ r0 L' a& ]; U if energy <= 0 [ die ]
8 T# T4 G M* v) k ] E; n1 S; R2 D1 ?* V
end7 D% J: ~9 J; r P
to regrow-grass
/ P4 Q) Z/ z, V' Y' m% l ask patches [
5 p0 I0 E* e' Z/ Z E _/ g9 z if random 100 < 3 [ set pcolor green ], G0 f7 K" S) t" S
]6 P# {9 p/ [, w. s( q# g
end5 Y# t7 g8 _* f
to do-plots' X/ @3 `2 u- m4 f- Z
set-current-plot "Totals"0 w- t' s1 _* z4 v* P: s* p( j
set-current-plot-pen "turtles"5 X( s6 \$ s1 D' {9 c" q; X
plot count turtles8 `( `" O/ n, L6 c8 s/ T
set-current-plot-pen "grass"% L; h! Q8 Q. S& X
plot count patches with [pcolor = green]) X5 G3 j3 b" a; _0 E
end
, r4 U9 k( S1 R6 y Z2 A+ E+ H可是运行时提示no such plot: "Totals"
v7 ~0 E( v" G" \% ?error while observer running SET-CURRENT-PLOT
( p( }, A9 T0 R# _2 F! | called by procedure DO-PLOTS
8 T, p+ T& i X: m* X6 D called by procedure SETUP
, C: m3 J9 m9 s# {6 | called by 按钮 'setup'
, T' y9 t2 r8 b8 y求大神解答啊 |