我编的程序如下turtles-own [energy]
( T- j& B- t: f: C/ S hto setup4 X" c' X7 Y ]4 J: Y( h+ B
clear-all9 t4 ^$ M9 g( O9 ?4 n
setup-patches0 I0 W8 w u- h3 ?/ h3 K6 n
create-turtles 100
& W6 r1 P0 G, E' p q% ~! E& ? do-plots7 O0 a$ @1 K% F; D$ w6 _
ask turtles [ setxy random-xcor random-ycor ]
; b- {6 T0 R3 R0 Xend e+ g" Q8 U; A7 {6 x- }! W& E
to go
- P6 \( P& v1 W move-turtles) h/ L) b8 A. S [- D( {8 s! X
eat-grass
& \# ], H/ x! |9 c, D+ t reproduce
) s& }2 Z' f2 M4 I$ a: @( s check-death
8 k! e* L: i/ ] _7 v/ M regrow-grass, ?2 R0 d$ w2 _9 d+ u" F" Q& D* v7 _
do-plots9 {( E+ s* s( Y4 D) b) r q& }
end1 t2 X7 l! J$ X! `8 x
to move-turtles
$ |% ~: S- U# f9 c& F- K ask turtles [$ E! h7 X1 `4 T/ N
right random 360
; N2 n* `2 X' @! u$ p; d8 d% u, ? forward 13 ~+ a4 Q% S, A9 z% O5 I
set energy energy - 1+ R0 }9 ^* x" n8 w/ l
]
, r9 e9 q, @5 J8 eend
; W( U. h- p. }# A! Yto setup-patches
' x1 b7 O3 N$ w! @! S# @ ask patches [ set pcolor green ]
: Y# v8 ]2 l, V+ \: Dend9 B' b. y4 `5 x. l
to setup-turtles5 d+ b5 ]1 f$ f" m6 g5 \1 V
create-turtles 100+ s0 P& _1 J+ D3 {; T0 ?' h# I z* p9 j
ask turtles [ setxy random-xcor random-ycor ] e$ h* {9 n% m& P& I/ {
end( ~1 g: q. u5 l" l( i- c
to eat-grass
, |" H |4 X# `! h9 i6 y5 L z ask turtles [$ a8 r9 J1 P2 h6 c4 z. i
if pcolor = green [! W, Q& T8 i9 |0 I) n
set pcolor black; ?' n8 w0 }" {0 n6 w1 @! F X0 D
set energy (energy + 10)
0 e* V. q& |$ L5 [& n1 q& ^ ]
0 l+ K; v0 P3 Q) f; Q6 k U ifelse show-energy?1 H: k' E. B5 A( q1 ~. Q& a( e
[ set label energy ]0 O9 R, ~) J! ?5 k: q$ c; h
[ set label "" ]0 i2 h6 s* v% p& Y1 Z( A4 ^1 b
]6 h P6 p) K% N6 s( W) R! Z1 }1 G
end
$ [$ W0 I6 p5 \/ q) _7 G! gto reproduce* ]) e' p3 Y% }* s+ S' _ H
ask turtles [
3 H8 M* b5 ^) U1 Z if energy > 50 [
+ _1 o0 g! ^" O& V. n5 [ set energy energy - 50- [" a1 k \: e4 N: q2 [
hatch 1 [ set energy 50 ]
5 T A) j! ]0 d9 K6 [: n ]1 D5 q5 I& d q4 A6 t4 d v& @
]
* W7 T$ ?6 u8 c6 o% C- {end
8 n# R; c1 ^/ N4 Bto check-death% G2 @9 Y7 F; R- t4 B6 Q
ask turtles [
& S' h' q9 T- G8 s$ b5 _. A if energy <= 0 [ die ] `- `0 ~/ k: x3 A, h/ ~
]; |, ]# Z9 m l0 I' r1 l
end! |2 \# V- q- n8 [2 h8 S% d
to regrow-grass) v( B9 h0 E1 }2 L5 I. n
ask patches [+ H2 R5 I6 ~$ B5 H, q m# a
if random 100 < 3 [ set pcolor green ]8 A# ]% i8 J+ Z- u
]
; T: f$ h0 @( r, P8 jend+ g6 w/ a1 r2 Z. @2 F/ Y' f. t
to do-plots
# k- e( W0 ~, E- I set-current-plot "Totals"
& T5 @3 ?: Y! E8 a5 P set-current-plot-pen "turtles"/ H6 k: q, l+ X
plot count turtles7 f% O" W2 I8 b" K* G
set-current-plot-pen "grass"& N& T% H0 z' y) f9 s: \5 J( s
plot count patches with [pcolor = green]
/ v0 o& J+ |' t% k5 a+ ]2 I9 zend
1 n3 M1 ^( }3 M% x: Y可是运行时提示no such plot: "Totals"
- Q7 Y. s( G$ |2 zerror while observer running SET-CURRENT-PLOT
- b( y- \ b$ h called by procedure DO-PLOTS
( [9 y. n8 w& |: t+ J3 o" `% u called by procedure SETUP
0 U8 \: M$ ?$ `% O B called by 按钮 'setup'; r% `7 i' W8 B" {: B4 ~+ k
求大神解答啊 |