我编的程序如下turtles-own [energy]/ Z% s8 _& l5 e: \0 l
to setup
0 R$ P- n3 F! E# | m" } clear-all$ o* [* {8 o. X* P+ `; m7 `* i8 A3 s
setup-patches
. h9 J N5 o i9 Y& q8 h6 t# Z+ | create-turtles 100
1 ]; K9 ~' F9 P' n' h; m: O do-plots
5 W- ?/ B0 W$ [8 b l Z6 ~' y ask turtles [ setxy random-xcor random-ycor ]
9 [ W0 c/ M" e' R, z2 ?9 Q- eend
0 A+ f/ Q7 O( k9 Kto go5 T$ \: d9 v% ]& Y; Y3 s
move-turtles" \& X) u- C& }8 Y2 a2 f; `
eat-grass
1 [! ~* N" p$ O4 f @ reproduce4 o" U4 U# A- z1 n+ `* e N
check-death
7 K6 [4 o) g* Z5 F; L" b( P, { regrow-grass: D5 U8 v3 q4 e& d/ X4 R
do-plots. d( R% i8 F% }* L8 e
end3 B2 Z" k% W3 x1 @+ t7 b6 l/ V/ `
to move-turtles
0 @, ~1 M1 ~( Q1 c& n9 B1 m0 s ask turtles [
, P0 A; H) |+ \7 t right random 360; r( W8 A4 W' t2 M- ]/ S. ?
forward 1$ W( i7 Q1 ~/ n8 C
set energy energy - 1# I! V+ D4 Y& V2 Z3 v2 }% B1 p8 b
]
- W7 v( q& C" x. ^: N: Uend# n$ R2 q* o. e9 `% Y. ]
to setup-patches
' X7 ~) K. O3 F9 C4 V ask patches [ set pcolor green ]
+ B6 e: n) |$ {2 F) B8 o) ~7 D. |, aend
- f* ~: c# \2 E. M* K0 ito setup-turtles
z4 `$ W9 D4 R# @! X' N1 R create-turtles 100. N/ p& V8 _4 b; u' u' s5 V1 r) V4 @
ask turtles [ setxy random-xcor random-ycor ]
4 B' u( S: ~. p2 x" V- H! ?end L$ |. g; T' O) Y% k
to eat-grass
; y" n1 `3 f7 ?: a0 { ask turtles [) b5 ^4 }, P) c v% ]4 `* I( U: X
if pcolor = green [
, I1 h: W" D0 a. M1 ^ set pcolor black
' c0 Q" L! V6 G5 Z+ m J set energy (energy + 10)' c# D+ p, ]& F4 z& B3 o6 X
]3 i7 P/ s+ Q x' j. W- m* Y
ifelse show-energy?
! q# ~) d4 A# {" i7 f; q [ set label energy ]
8 _9 j% U0 l) G$ D [ set label "" ]
4 {1 R! s# R9 M0 C# l4 S( E( }/ V ]
; `9 _2 M# K- e4 eend# F6 N: W3 D( h: p, X8 k; l: M
to reproduce
# C2 K B, k; R7 r ask turtles [" Y- N! L9 M9 x) f; B9 E3 @
if energy > 50 [% i- o @3 b/ ^4 d$ O
set energy energy - 50
( G( V) c9 s! O" y hatch 1 [ set energy 50 ]
" H+ o+ u* }. R% ^/ f ]4 [ D/ h: h X& b
]8 P4 R! M( c, j$ l; P8 x5 ^; |0 M
end
) V7 T& P+ ]5 x4 `to check-death. [) ]% c5 V, R& d6 G
ask turtles [) W% v4 j% u+ D+ D( x% l3 J
if energy <= 0 [ die ]6 X% B. {$ ~ T- a: M6 }- x4 U
]; A+ i$ V9 U+ p$ n/ q2 @) _
end
. T* T) w6 z" j& |7 M8 _to regrow-grass
' q2 |! V1 x2 e) `+ A+ f/ { ask patches [( ?" w- p2 u( Y9 Q$ S- \
if random 100 < 3 [ set pcolor green ]
( F2 B7 ~- m! x+ U/ v, D5 \- w, l ]
% a3 M% q' k! E, Pend
; r, \3 i, E2 r3 Z" x' L! S1 oto do-plots2 q# t2 t5 c9 j7 h
set-current-plot "Totals"1 i1 [. n" \1 a
set-current-plot-pen "turtles"
4 X6 T$ D3 E, l5 l plot count turtles
1 F0 R4 b% I# [' A* P set-current-plot-pen "grass"% A) |& m# ]% r' ]- a" }
plot count patches with [pcolor = green]) H7 w% W2 A4 f$ t
end% x- t( t) r0 K7 T$ y. D1 R. X/ t
可是运行时提示no such plot: "Totals"
3 a+ C; X/ f3 b6 X( G- B% o# r+ s+ Werror while observer running SET-CURRENT-PLOT
- S m. m5 H1 ?/ h9 ] called by procedure DO-PLOTS
* u# r& k( w) r+ T8 @' W called by procedure SETUP
. X5 e# p* ~; H. K called by 按钮 'setup'
: N! _# i" ?* L. z求大神解答啊 |