我编的程序如下turtles-own [energy]2 g6 M \# U- }+ U
to setup9 A# T6 m) U' Z3 O( e$ g, U
clear-all! h% w8 Q2 P5 B$ o* g" l
setup-patches6 W. E% w7 v1 H4 S3 }' v, f
create-turtles 100! s) k8 W8 b/ D! E$ N( l
do-plots
/ T- _4 q. O' O! ?0 g ask turtles [ setxy random-xcor random-ycor ]
K5 u4 w. i. L q& I7 ~end
6 u8 d# c ]0 |2 tto go
2 d2 h5 e" b" i, ~5 n- b! g move-turtles9 C& s8 U- l9 Q
eat-grass! b/ \6 z% e1 s3 P4 W
reproduce
( s2 n9 {4 d5 ` T check-death& @& B( O/ |& X: I! I+ G
regrow-grass
- F r: }# o; J1 ?/ U: B( {4 h do-plots& f% W1 e9 L' |2 u" j% s6 s# ~1 M, o. U
end
9 F) C' d% L# g$ q3 A \2 jto move-turtles
8 x7 }- @/ G: X: ?4 D( ` ask turtles [
0 N, l+ k+ H. U right random 3605 W! t$ ?# I# T0 u3 h! N
forward 12 {) u) d0 u6 q2 H7 ?
set energy energy - 1
0 V& F' A) @+ C4 l M ]
! [8 @- v z [2 u9 D7 H2 l9 mend; E8 t& X, b, r* v
to setup-patches+ i0 _; X |( ^4 S
ask patches [ set pcolor green ]
7 ~9 T7 O4 i/ \1 W B# B+ y! Yend
0 |" R) @: r) D& x% _7 _0 _to setup-turtles, C1 G5 F. g9 S6 X; _
create-turtles 100, Q& ^; ]0 g& L3 ^
ask turtles [ setxy random-xcor random-ycor ]9 X8 e) z. @/ q2 B$ Q
end
D) h% n* G1 o2 A* l# J+ a0 rto eat-grass
$ u6 d1 t" O$ x, e. e- K, D/ d ask turtles [* c3 U1 Z: w4 S) I& i
if pcolor = green [. R( M3 U3 V d
set pcolor black2 C9 V, z) {+ [+ U% c1 I
set energy (energy + 10)
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ifelse show-energy?2 B6 I4 i5 f( Q0 f* X1 E
[ set label energy ]' ?. f6 Y" @1 I( k
[ set label "" ]4 b+ P& _2 E' J
]
7 y% L1 A0 F w8 ?4 uend% e- M" f2 y" G; _% n5 z
to reproduce
5 x3 V b% Y* F. m4 V8 I. w6 p ask turtles [$ ~0 L* A7 j& G3 {8 F
if energy > 50 [9 D& [4 S, y6 u( M3 D3 d! p3 K+ P& V
set energy energy - 50, M, C" D" t# l8 z+ H& Y" z0 U
hatch 1 [ set energy 50 ]
4 k/ [6 Y5 x" b+ M* _% H* h1 L ]
% |* m6 x" `, k ]
- P' j% u- H& e2 F- iend
- B4 K; r+ r) q# q0 R) h5 Rto check-death: w, ~( U) R7 Y- E+ R
ask turtles [$ ]( C0 x; E# v7 L$ B6 M; o) _: j- i
if energy <= 0 [ die ]
4 l' ] F) ]' L" L0 q; E ]
/ _& g9 b& Y' ?, xend
/ N9 E2 i' _; S5 I9 L2 X; Rto regrow-grass6 q' Q* Y1 w: X
ask patches [
( M! H* _7 [% ^. l; R if random 100 < 3 [ set pcolor green ]
" X7 s4 l1 b4 ]8 w7 Y8 F ]
/ T+ A1 z" ?4 r. @( q! z: zend
0 E/ v9 @2 ^* Oto do-plots) u0 l7 | q! G8 P! _/ l6 y7 f
set-current-plot "Totals"
9 S% W% [1 U5 V- `1 Z3 I set-current-plot-pen "turtles"
5 `4 o: } ~+ O4 |, P0 h7 @6 _ plot count turtles% c$ s) v& p1 Y
set-current-plot-pen "grass", _3 N$ K" ~/ n: F* W" S
plot count patches with [pcolor = green]5 U2 }7 m; B4 P" ^& h# K
end
2 v; y8 K# y9 W) V1 m! B' c J可是运行时提示no such plot: "Totals"8 d2 ?$ ^& t- U
error while observer running SET-CURRENT-PLOT
8 E( A/ m9 ] [' N called by procedure DO-PLOTS
" J4 f8 u9 E) b called by procedure SETUP
% ^4 _5 k8 r \ called by 按钮 'setup'' r) t/ k& k8 R+ O
求大神解答啊 |