我编的程序如下turtles-own [energy]
5 Q( p( h+ h* _% vto setup7 f7 `. ~2 [' C: v: m: I
clear-all9 n c: q% `5 y3 E. ?' `/ M
setup-patches( V. w# y. @/ B
create-turtles 100' c/ R$ U) }$ H
do-plots
0 r( I6 K+ Y7 P4 w ask turtles [ setxy random-xcor random-ycor ]
7 P1 ^# v" \# ` ?: X/ U% Uend; Z8 s6 z/ X3 g6 i" K- }
to go Y8 a5 w! t! V" U+ }2 h
move-turtles" Y7 B: o$ Q' m! p; r% }3 e
eat-grass
; J; @) f2 u T0 z* J reproduce
: |& _, |, m. R2 J; [. W check-death( f4 ?3 I2 L; O
regrow-grass
- c* j; `7 L. q+ I* R6 [5 d6 ^ do-plots
4 i: A# W! p6 @4 x4 r/ I: _end
: Z" u2 _9 d& |0 u$ \- V- qto move-turtles0 z6 W$ p4 Q; |# j$ h+ R. z V
ask turtles [
% [) h0 L: g* X# q; \7 I right random 3607 h+ L6 b/ }& |! @) }2 ^
forward 1! N1 w* }3 ]( T& N) o8 p
set energy energy - 1
, f4 `5 b. s f, w. S. u. W ]
' ~! k$ h8 w. M8 k# oend! x2 z! B; O" J
to setup-patches, J' ?- h) i( t# K) R/ H; n
ask patches [ set pcolor green ]
9 ~0 ~1 v( u. \8 pend7 _* C# V$ S V, n) \
to setup-turtles
# ~! a( U" A& M. n0 o6 z create-turtles 100: z9 Z1 D/ y4 e. s( C
ask turtles [ setxy random-xcor random-ycor ]
1 i. q ^6 ]2 T" ^) f" y6 X9 iend
7 i3 ^$ o3 k3 v7 |8 U" _# Gto eat-grass
/ _& f0 k# {8 ?9 i+ @ ask turtles [, x! @. X4 p& P, F
if pcolor = green [6 N: ?$ r4 s' l- Y4 @2 K
set pcolor black
3 l! u3 a( ^7 ?4 l- w" J% i set energy (energy + 10)* f4 U6 [3 M% Y( @+ K) N
]
. _& E' C9 ]- M5 P: F- \ ifelse show-energy?
$ ]- x/ y" R3 S/ E; D r* V [ set label energy ]6 {% l+ A: Y' r( P
[ set label "" ]
1 W7 w4 U- P1 v2 e/ L/ k8 G ]
: X: U I- H$ e! P- Uend
7 ~+ h, n! Q! X, Y& ^: P$ Pto reproduce# u6 p! i3 H' }* T# W8 e9 V& o: j
ask turtles [+ h9 Z" c6 U& Z/ b$ k. ~$ W
if energy > 50 [/ @$ J. S5 D4 H6 ]7 k
set energy energy - 50
4 [3 D) y7 U3 ?: E6 v. w4 Y hatch 1 [ set energy 50 ]
1 _; G1 N6 f. t8 r7 y* j1 I D ]6 {2 o& G7 ^3 k* R6 i
]+ W `" q0 ~: j; A, O5 z0 x
end
2 H! [+ t/ }7 P! {" L' fto check-death6 k9 W; G v$ w) a, z1 X
ask turtles [: P$ o2 M' R6 o" r. V
if energy <= 0 [ die ]
6 x G. K' s6 t+ s/ K ]- B. U5 L0 Z# y5 q2 i2 \& G
end
+ v6 X9 M; ^" J' ?$ k3 kto regrow-grass9 K9 W+ J1 K: _, K( y
ask patches [0 E( R F* j" V
if random 100 < 3 [ set pcolor green ]
: Z2 r6 O' S1 ?3 r3 u ]
R' v% F$ y" a+ k0 O: K6 O qend
& Z$ G4 ^5 o' N% e/ w; F+ \, T# \( cto do-plots
$ `$ u0 { F# C2 p' v0 G& Y) v' L7 |- z set-current-plot "Totals"
) G+ t3 P" n0 w; n' h0 |5 i+ \6 f set-current-plot-pen "turtles"- f4 `4 I( r4 v0 H, g# v: k
plot count turtles
# g% L- {$ Y0 l6 U' `0 d# T set-current-plot-pen "grass"
; ~7 Z6 Z' M2 B plot count patches with [pcolor = green]$ V- j/ b$ f# v1 l$ C
end2 X/ ^) C1 }+ c3 O2 j3 P l* t
可是运行时提示no such plot: "Totals"$ h' Q; F. Q9 u! T# o
error while observer running SET-CURRENT-PLOT7 X0 N& D- @+ V! l
called by procedure DO-PLOTS
2 T/ Y+ b" ?3 \' K$ g called by procedure SETUP
3 z- w5 d) e' l. s. p8 T: l called by 按钮 'setup'! [* g: U$ o8 X, x
求大神解答啊 |