我编的程序如下turtles-own [energy]5 g" T8 ?$ p, q
to setup
0 q5 H# V& o" N$ h$ h$ z" w9 w1 C/ z clear-all
M: E2 Y2 Y% H4 |1 Z! h! \3 ` setup-patches
8 e4 t, |% r/ U create-turtles 100
. A7 y( P" C# |% {8 W. X; M, x. X: m do-plots/ D O# S% m8 |! r. w* T; f
ask turtles [ setxy random-xcor random-ycor ]
1 { A( M1 J8 e0 L, vend1 `' g* P- P8 q9 b1 D5 s
to go/ a! u8 n2 r* p, V3 \
move-turtles
# Z# @! j+ N/ {7 a1 w eat-grass& z. M- s: l( E- O! ?0 g
reproduce
$ q1 q: X. w, v/ b check-death
* f+ b, h" Y! i regrow-grass4 d6 c8 \9 T' A
do-plots( O- w2 } @+ V' q+ P: q: A7 h i
end
/ ]0 Y& f2 b) lto move-turtles
" ~& E7 ^6 M: H( ~4 [3 \ D0 Q [ ask turtles [
8 O- X( d; r8 l1 r right random 360* f. `: @2 ?4 n
forward 15 p4 N( e) h. _) f! ~- j9 \# y
set energy energy - 19 N1 I7 c7 @" q+ \: {" w
]
' Q Q" A$ A/ |; E* V9 p6 cend
: _9 O3 `) R8 y0 G5 B8 }0 ~# N Ato setup-patches
y5 Q) O) l! M ask patches [ set pcolor green ]
6 @% D) X. f4 F: I* K* B6 Vend0 b5 j( O- y+ X$ B/ Q
to setup-turtles
4 n, E% \3 l5 S1 e- w4 @ create-turtles 100
8 N! X" T. J, ]0 x% i; S ask turtles [ setxy random-xcor random-ycor ]+ p5 h% K$ I: e% ~! L* P) P
end$ j8 Q/ j/ g" e, L' E7 @/ ?4 ~( c
to eat-grass" p' U% J. m' Q& G& ~: X4 E
ask turtles [) \/ V5 j/ ?, z& P5 O n! o5 R
if pcolor = green [+ R" H L% K9 P4 I$ I$ W& ]
set pcolor black' o8 v7 p" G/ _9 q1 z
set energy (energy + 10)
4 s8 g. [( Y; i, s' R ]
5 [5 F; j. O8 N, D* I ifelse show-energy?
' q3 f' q8 f' k! i9 F1 R" C" l [ set label energy ]
# G! `' K) E- y) M; a) F [ set label "" ]
6 C) R7 K# K* o9 l* m2 `* G9 B ]# l' x, p# {8 ]7 i
end
/ _, B8 A( n1 ~( wto reproduce- K$ g, b+ w8 C0 ^( u; [, G
ask turtles [, _ l3 |; g1 U5 Z# w- G
if energy > 50 [3 p% T0 W2 p2 Z+ F/ h9 R' k: e- v
set energy energy - 50
/ b( i, O( n5 G Q3 w( g hatch 1 [ set energy 50 ]
: V& D& h( d, F ]$ Y7 O. K! Y& w( f b+ `# u4 o
], m5 y& {$ I& E1 d1 a
end/ o- b4 ]* J% r5 z4 `5 L
to check-death+ K( Y. q2 {7 a" z' s @6 l& y
ask turtles [
b1 w6 y( \3 |# s. y% n if energy <= 0 [ die ]1 V3 j. K" r! k% ^
]
) \! Y$ r7 F1 A* Yend, ]# @5 @# L6 S1 e8 @- x
to regrow-grass
4 ]; A7 [' o! U8 x ask patches [
[4 B' j% {" ]4 I) \ if random 100 < 3 [ set pcolor green ]: o! q+ o/ n- w8 D; |. v# ?
]
9 a& f) |6 {2 ^2 `end9 }+ R4 u' \. R+ S! M9 p- p
to do-plots
2 {1 [9 W2 f+ q4 ^8 b. M% a set-current-plot "Totals"
$ Q6 h R7 ?4 l) l set-current-plot-pen "turtles"0 j6 _" _0 b; G2 [+ ?1 q( m
plot count turtles: |( z! [; {* {0 g3 E* N7 G, Z
set-current-plot-pen "grass"6 A3 c0 e4 `' x
plot count patches with [pcolor = green]
5 H6 A" N. r- z. `end
& `; c( @, x8 ?/ x N可是运行时提示no such plot: "Totals"
3 G; G' @) v$ _! K/ X1 z* Oerror while observer running SET-CURRENT-PLOT
8 g( V. ?% Q7 e1 Q called by procedure DO-PLOTS
: b3 v; O! R# S0 }1 L called by procedure SETUP8 a! H+ J7 `2 V+ D1 v M
called by 按钮 'setup' u! M- b& I5 x. _ M5 B/ M( e
求大神解答啊 |