我编的程序如下turtles-own [energy]6 Z: S$ f) y% f( q! R* b
to setup
; P1 l0 H; [( I% C* S3 F clear-all
8 R4 p; g" d# S- h$ b7 D: H1 P3 Z" V setup-patches: @1 i! l4 j6 |! L$ k8 O
create-turtles 1002 a7 _+ D8 U" c4 S
do-plots
u( B, j c; d! z3 S6 |8 k; s ask turtles [ setxy random-xcor random-ycor ]
7 y# Q) H3 }* o" Q- L4 d2 Iend8 z& O3 l/ l( E( i& _* W7 C
to go
% A$ l/ w. E* U3 C# h7 ~ move-turtles
, @: y( v7 p: D& \2 j eat-grass# X" v$ i$ m2 ^
reproduce
( T% X- I& q! {; K+ l' U1 z9 Y check-death
6 f. F+ u) I. y, G6 k# e1 `5 s( Y* Z regrow-grass2 |' F, |% t c" x$ g7 d( ]# D8 H
do-plots
- h" n) A! r% d2 E+ e! Gend r& A; W o$ K3 \2 ]+ b
to move-turtles
; O, ?9 |! p; a" W ask turtles [/ F! W* t) p+ h% X6 s" F+ y- W& Q
right random 360, k4 `& `& ?: _5 a
forward 11 Z0 V2 ]9 X/ z
set energy energy - 1
% {6 ]7 X% |& Q ]
# M Y+ S9 q m& Y0 O$ Mend. ~* b+ E" S4 F! x7 D
to setup-patches
! W, ` [! ]1 B# _. U3 g [ ask patches [ set pcolor green ]
! p* L9 ^4 R+ y+ Y( ]7 Y! P, dend9 Y' N/ h" V/ H/ v2 n/ Q, C
to setup-turtles
1 O$ n4 |1 u# U K7 t$ d/ c create-turtles 100
1 K; l4 p1 R, P8 @' }+ g$ B ask turtles [ setxy random-xcor random-ycor ]
/ q8 q8 L/ G7 I Oend
; l# y) \* f4 U/ {6 oto eat-grass
) T, `5 {; @- k* I4 C5 m) b ask turtles [
: u6 V# C( G8 I- T7 n0 A' O if pcolor = green [
& }7 y( E% y8 S; ? set pcolor black
. ]: M4 Z) X5 l' E2 Z( X. w7 W set energy (energy + 10)0 c0 |4 x* u% n/ L; H0 | k! d
]
$ p) d7 F4 y8 B1 w# O5 q7 Z. Q ifelse show-energy?
# C, v- N3 s3 H, m, T [ set label energy ]
" A8 N7 p# o% c, s1 X5 _% g' l; c [ set label "" ]( A% ?# ?6 N/ X4 y: G7 H0 F1 w4 W% Z
]
( y8 m6 r7 Q& p; n: Y9 T6 l8 Zend J! [/ ? I# V7 J1 g4 Q
to reproduce
& f6 @0 A" t* A0 \" M ask turtles [3 H' Z9 X; ?" Y3 m8 v% y9 r
if energy > 50 [
* Q8 D1 d$ Q0 p" ^# I3 m: R set energy energy - 50
% X9 x! K) f8 \. Y hatch 1 [ set energy 50 ]
, ]% c1 z- X% y6 t7 d' t3 K T \ ]
$ B3 n) z5 ^: J9 Q8 J8 e) v ]
5 z9 l) P. T) w/ q2 G0 Tend
b4 i- M5 }4 U) y4 fto check-death0 O/ D" W. z' b$ @8 ]) a! H
ask turtles [( O$ w- d1 |' q; ?
if energy <= 0 [ die ]; _# X" d! O/ s3 `
]6 {3 @' @% y9 p: c2 U4 D
end# I: g' \/ m2 b0 W! B
to regrow-grass
6 J' p0 r: C( R+ x3 j: ` ask patches [
, F: c1 c; n) O/ n* g if random 100 < 3 [ set pcolor green ]
" D8 h/ z, B) q ]
! W. H5 F( z, g, Gend8 ~( I) L% `4 a4 C
to do-plots }0 v( Q! R1 l
set-current-plot "Totals"& p, E7 b8 U; ~
set-current-plot-pen "turtles"
' `, n. ?0 ^0 l- Q: m$ Q# H plot count turtles
. }: ~% U# h8 i, m8 ^ set-current-plot-pen "grass"( C6 r6 m! Y$ ?, u# g
plot count patches with [pcolor = green]
0 s) S3 ^" `! n O* x! f( ?end
* [9 }2 c3 Q K5 @7 i; L1 k9 Z可是运行时提示no such plot: "Totals"5 v. C$ M7 g! @; ~8 M- b$ k4 x, K
error while observer running SET-CURRENT-PLOT. J/ B- n# v! F
called by procedure DO-PLOTS, i$ V3 _* Z, M6 q9 B& ?
called by procedure SETUP
& t- |) n, ], n called by 按钮 'setup'* u- }9 a: \/ S- R: G
求大神解答啊 |