我编的程序如下turtles-own [energy]
2 C' y! a# Y1 T7 A v5 `; nto setup
: Q* y1 @& q* d/ y; ? clear-all
4 g( N: x S$ ?3 S6 e+ M setup-patches
8 \# ~: X* N& U% \ N create-turtles 100) g8 N- Z1 S2 r
do-plots1 d; Z9 T( p% M( {; R
ask turtles [ setxy random-xcor random-ycor ]
8 J" d* x+ b9 m* @+ o) x5 z/ uend
; F. v+ w& o, X7 M2 t' z5 `( Xto go
, c7 a$ o& S: B7 c! w2 t8 v! r+ c move-turtles
" j9 H' B- {* u( C4 N eat-grass! V; w; G1 ?. s0 \1 X
reproduce
7 S/ d6 E: ~; K- C; k check-death# C, A8 S, D' o
regrow-grass, m# x& N9 ]8 T
do-plots8 e' N) ?+ l, |8 Y0 \) {
end
* v: O7 i3 l" U& W: hto move-turtles
: M1 l" a- }& S ask turtles [
7 Y: `, P+ V/ ^" x right random 360
?% V) k( u- F6 e4 E% Y, z forward 1
, t8 _* l# Y% w- H0 L7 w set energy energy - 1
: b3 E3 c1 f$ O6 X* D ]9 |& ~; m: O3 h( D# f7 Z
end
* Q; u3 s4 \. f( U% K& dto setup-patches
i }, U! p$ j: A* v1 }5 H ask patches [ set pcolor green ]
7 d5 n; P' T+ w1 `9 ?% D- aend0 P$ Y* c9 X' x" n
to setup-turtles3 C K6 O# U# O9 W" M
create-turtles 100
8 N* c# o- Q0 {: g" `- f3 H ask turtles [ setxy random-xcor random-ycor ]
" ?- U1 a; v {) [/ H1 B+ vend
/ `$ T3 R) `; G5 n T. Zto eat-grass
E2 b8 w/ B; k ask turtles [
+ W+ C5 b/ d+ \7 a/ ?# [ if pcolor = green [" H9 s( v* t# A3 `9 Q y. @3 E
set pcolor black
0 e4 n+ o* R1 C# W+ g* t7 C set energy (energy + 10)
% p; m2 @8 A- W6 ]3 G1 Z ]. I6 g7 \! {+ z4 n/ m2 H0 E/ b) P: W
ifelse show-energy?4 y0 V9 J# M( e) K% M6 m8 ~
[ set label energy ] i) u, F9 h7 L: }6 x7 q
[ set label "" ]
* ?# a; [& K, h; y& ` ]
' n& F& X t. C# u9 f5 h: ^end
9 I$ t- h$ O' [2 H5 [& g% w- Pto reproduce& w q# ^7 u" d: u) E3 d
ask turtles [
3 E* a( t0 ]& {' I7 ~2 ~ if energy > 50 [4 D+ P G1 r$ a. W, U
set energy energy - 50. Z6 I i! l, v4 X; n, V! M- x# c9 S
hatch 1 [ set energy 50 ]8 y, I+ Y% ~: g7 s
]
5 \8 ^$ i8 o l! w5 R7 ] ]
( \3 f5 {6 K- t& ?" @# y* xend: @: y/ Q/ A0 G1 n) W l
to check-death
, @' [7 {8 m: ?; G8 i) B/ y4 @ ask turtles [
- `* Y4 o; C h+ O if energy <= 0 [ die ]; N& Y$ y6 n, _! @3 Z( J5 {
]+ N2 J$ U, @" \% m- p' C, f
end! ]3 i4 z) S" I
to regrow-grass4 ~3 _( L4 M- G7 ?) ~: {- D
ask patches [
, z p. F: V' x8 P. j0 ^4 N: N: w if random 100 < 3 [ set pcolor green ]5 \* V9 |0 @4 T) B0 X
]' x- q2 D+ \' G7 H
end, N* B0 s8 l5 D! t% o
to do-plots
8 C$ p0 K' f. G/ [( J set-current-plot "Totals"
( N$ w3 J3 `( d: H+ W# F/ N set-current-plot-pen "turtles"/ s0 K, k+ Q. K% {: a" [
plot count turtles
# Q9 l W! l0 a9 z: Q set-current-plot-pen "grass"
6 w) ^1 `9 p3 Y plot count patches with [pcolor = green]+ o! O6 W$ U) V. }1 A: [3 F' X
end k" [ L: _" ~9 {! a- v" ~
可是运行时提示no such plot: "Totals"% ~! Q2 G# t' @. L* ?
error while observer running SET-CURRENT-PLOT
" Y) V% @( r: d1 _ called by procedure DO-PLOTS: m+ U" P$ L* a( X# q
called by procedure SETUP
8 @1 ^* @$ _$ [* r) M4 ?! c called by 按钮 'setup'
* A, ?) K% W+ e/ E9 E7 W+ h$ N' w# I求大神解答啊 |