我编的程序如下turtles-own [energy]+ V1 A# Z1 w- |& t; H
to setup8 l* J0 t6 H+ W% F* t3 e U
clear-all
6 h1 t2 R/ H1 |4 w setup-patches; m" H/ M5 E7 p8 Y& y# t) F6 X
create-turtles 100& {5 t0 y) K% q) |/ u2 h
do-plots, K4 Q' w+ r( [) Z
ask turtles [ setxy random-xcor random-ycor ]1 W/ n+ A( o ]' T/ c c
end5 O7 w3 X- f1 c5 {! G# r
to go9 q4 `1 @9 l, _6 P0 O; q9 ?0 Z6 S0 q
move-turtles7 ^3 I- n. a1 \$ ~, x
eat-grass
' H& q/ Q8 J w" X/ w, U- f, V reproduce
8 m) p0 ^- U4 C check-death! N% H6 [0 X% E( g- W
regrow-grass
) r! {7 d) i/ [$ B A) o9 z do-plots
( J @% U, m. J8 Cend2 {( i4 t4 m3 ~' N6 }: V1 ~
to move-turtles
; N' q; f i( T/ {$ Y% V, q ask turtles [" y$ J6 M+ k0 m+ w$ k# o3 g. Z
right random 360
6 Y& G8 b7 n) G& E forward 1
1 I8 U- F6 t5 F8 @9 j set energy energy - 1
( g. n2 _- O2 b- v2 s ]
% r, V/ u( ]2 l' Wend% `: ~* \! i2 v, J
to setup-patches
' q9 y, l; t5 i* x3 H, @ ask patches [ set pcolor green ]) G4 o+ l$ g; q1 Z
end
9 p8 y8 I. G- @0 Ato setup-turtles
* V+ }- C% ^% Y X0 X6 F create-turtles 100- Z* P. `. P9 X+ b# d8 k
ask turtles [ setxy random-xcor random-ycor ]
! d T } G3 F6 M7 j* n# |end
' h3 ^/ G2 l; O: V+ x4 c2 ^to eat-grass+ s5 t2 w8 S* _& k% i0 D& P
ask turtles [( n9 y2 L8 V3 K6 R+ s
if pcolor = green [/ r5 I0 X: e. G/ E: \
set pcolor black3 M+ B; z: I; V0 K* z
set energy (energy + 10)$ c z5 z9 b8 x7 U
]) b# o4 [- s( P) k. A
ifelse show-energy?
6 l% \! F7 ^( d ]4 s# y9 Z* D4 M [ set label energy ]' ?! ~1 I8 M! O7 _/ I' d y
[ set label "" ]
. K) Q7 \; ?, ^& Q3 i ]
/ F/ P. M8 r3 G# ]( D5 _/ ^end
* w6 O1 |5 R5 E) @to reproduce' R2 p/ a. t' z# u! D- c
ask turtles [
' }! _7 T* d A; s; f$ J' Y if energy > 50 [$ o1 O ?5 g) s, ~8 z
set energy energy - 501 ~) e4 F: A2 h- E9 Q5 a
hatch 1 [ set energy 50 ]% D" O) Q2 z" N8 u0 m
]
$ `) y. Z+ G* Z6 v( Q5 w ]
4 n1 Q% L0 D7 k+ F4 ? Tend& T4 n) ~1 Q9 w* O4 O# i
to check-death
$ ?) K. f" u: q: j ask turtles [
. X" h' o- y5 M/ ]* H7 ?; n% C2 i if energy <= 0 [ die ]! l+ l4 x" L' r" b. }
], P# @' D" s# |, O! U) Q
end
( g* G* C0 L W& ?to regrow-grass
( a t3 U" e! `) t" j ask patches [4 I2 f, a. m4 P. K! x. q) v
if random 100 < 3 [ set pcolor green ]
* e3 k" R4 E+ J2 j ]
0 R3 S/ K: L- J2 m% ~4 d Nend
" k, X, H6 f0 U/ n+ `9 r4 i8 c2 qto do-plots( S |) u# U3 y1 |* R4 F. K
set-current-plot "Totals": r# J: l b% n- A5 c# `& B0 W
set-current-plot-pen "turtles"
2 w+ o+ V' s. G) w plot count turtles# a3 u5 [* l* s8 @6 t* H
set-current-plot-pen "grass"
' E. r. M r/ L1 I: J, t: Z plot count patches with [pcolor = green]( u( P7 ^; y2 n' H: X
end
' O5 b/ w3 c1 n( f; i) P可是运行时提示no such plot: "Totals"( K5 j4 j3 F4 A$ A
error while observer running SET-CURRENT-PLOT
- Q. X# n$ ? N* I9 m2 p called by procedure DO-PLOTS- u/ [7 \% }5 a/ R/ u) Z
called by procedure SETUP( J0 N& k( E) u; ^' f
called by 按钮 'setup'' P; e. o5 c! o: d
求大神解答啊 |