我编的程序如下turtles-own [energy]
2 B: t: g- D# n2 u0 P1 nto setup
& q) f8 u1 n, T/ O* f) m- }" A clear-all4 b& j* [6 _' [' a6 }) N
setup-patches
3 |, i, v ]# Y create-turtles 100
' @# c7 z3 o/ _$ \ do-plots$ O6 T" G1 U( |) T+ O
ask turtles [ setxy random-xcor random-ycor ]
, q/ D5 y' O- V u2 y+ s0 oend
$ y7 Y* y0 x: p t8 n; n3 \' Rto go) b' Q* I$ F1 m6 ~/ D5 {- P; t# {7 j
move-turtles
4 U4 _2 T8 x( t( }, e, Q eat-grass
% Q: ?! \ l5 E' M' Y |( p" A; ^8 q reproduce- U7 O6 d( E6 H* @- F' ?
check-death
# w- j; x: M5 y6 Z9 p( ]6 g- P regrow-grass- r. U6 y2 y) F! ~+ E2 }
do-plots5 I6 o6 Y0 ^' z
end
) n- P* S1 h, g# n+ O E, v! Yto move-turtles
3 j9 Z/ A1 D( P% \ `5 x$ S ask turtles [. {' D/ q1 ]. {# ~/ U$ w9 v& l7 a
right random 360
; t8 G8 m, X" s. ?3 _ forward 1$ }9 c! t4 e( g7 v, M
set energy energy - 1
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end
4 }4 q3 h0 j+ o4 V- l1 {to setup-patches
' y. g4 @2 }7 z: V/ k! |) h ask patches [ set pcolor green ]* R) ?; e% ?/ e' m
end7 o t4 x+ ]" H
to setup-turtles
# K. a6 E( d! f) Y create-turtles 100
, X4 {$ D% W2 ]. F% p2 L ask turtles [ setxy random-xcor random-ycor ]
& j7 W5 g0 i, ~0 X5 X% Iend
( s5 G& i; g/ kto eat-grass7 f, V; k& ?. l
ask turtles [
2 m8 c( r$ j/ J, w) a! y% c if pcolor = green [$ Q& E" Q9 G& }& s
set pcolor black/ i5 b- g& I. D) B8 p* s% M
set energy (energy + 10)
" c W$ c) U1 b; C- c. s6 X+ J/ S6 ] ]1 S% [- F* T. k" q
ifelse show-energy?3 B8 y# V* u( X& B
[ set label energy ]5 ]( Z, _; L2 l& q i6 l5 |
[ set label "" ]
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end
# ^* W* b% U1 K; J# V; i9 ?: Nto reproduce' g$ W2 F5 |( k2 v: x
ask turtles [/ ^( n _/ U" L& a8 Q1 K6 M3 g
if energy > 50 [0 _2 D+ B' J( a
set energy energy - 50
$ l3 |6 u; V- |7 J1 Q% `' m# c hatch 1 [ set energy 50 ]
& f5 B7 H7 S2 z8 g }3 d ] X/ m% H6 N. l
]+ a0 B9 N# M, u( H# U2 L
end
8 |, O# F" D: `) kto check-death$ k+ N' H u2 O
ask turtles [ [9 u7 r4 k" n3 u3 L. _, _4 R0 u
if energy <= 0 [ die ]: D7 K6 |7 i; n# N7 ?- \
]9 _5 J. H) _6 [+ J. a
end
+ ]) U" g3 I4 I& q* `+ Oto regrow-grass
/ T, Y2 I; Z5 J' @$ z# L! ?4 b7 N0 Y ask patches [1 o4 k9 [: c$ d; e& V) F* y
if random 100 < 3 [ set pcolor green ]9 ~1 t# o0 V& W5 u8 W1 c
]
- w" M7 \0 N9 |' ^end
$ h. g8 n1 }; w& D, B9 yto do-plots7 ^/ T' C- }6 }) r; B
set-current-plot "Totals"4 f& l( K+ \" x( C
set-current-plot-pen "turtles"
6 X2 T. E) R& c* Z g' y/ Z& T plot count turtles
( e& _ b" |6 m set-current-plot-pen "grass"0 w j1 N7 Z5 w0 K- D `& Z1 x
plot count patches with [pcolor = green]! v6 H6 _) y0 z- T
end
8 {& d7 r3 T+ Y/ M可是运行时提示no such plot: "Totals"* q5 ?# S5 q# V
error while observer running SET-CURRENT-PLOT |/ }; b9 a& J: N0 u
called by procedure DO-PLOTS
9 m2 l5 u/ e! O. S+ {: ^& r( y called by procedure SETUP; A* |$ q4 k" y% z1 \. y
called by 按钮 'setup') d/ X* d2 N0 o( F
求大神解答啊 |