我编的程序如下turtles-own [energy]$ t( c! i% `5 X
to setup
# q$ `* P8 N, y- J5 l5 I! K0 A clear-all: K; \, W) y1 L+ v# R: f
setup-patches
+ K7 O5 V$ A2 o8 K create-turtles 100 y: x5 h3 t! f
do-plots. s. F! r( h H& S
ask turtles [ setxy random-xcor random-ycor ]8 q$ m j s7 @: |0 k" s% Q; Y1 {
end
8 l, {9 E% L/ m8 kto go+ `! |7 }* F3 C* S
move-turtles
( }7 a8 } x( S eat-grass2 J; Y4 z3 g2 i- ^& `
reproduce9 m r4 s" R9 W: Y* e
check-death
0 ]0 u/ q$ N9 X. P# Z2 X1 X o regrow-grass6 \3 u S) z6 T+ u, c
do-plots8 J s% C n/ b4 h3 E# h
end2 n1 @. i( S4 Y$ ~. \* ]
to move-turtles
/ @! v/ l2 m4 c" P ask turtles [
) d( b% M$ |, h7 x4 Q right random 360 w& A3 u+ G5 j9 o- r
forward 1# A+ d* U: Y: W' E5 F! ~3 l7 g
set energy energy - 1& K! b U2 A5 k& Z/ J3 i
]
0 v' W8 E; o3 v. H& F( qend
# c* k( R/ Q" o6 uto setup-patches6 N" G. ]* F, a4 |: p/ W$ o) [
ask patches [ set pcolor green ]
2 s3 b9 ?0 L" ]end
2 M! y: V( P! R0 Y; uto setup-turtles5 k: ?% N+ D4 _ E+ t. o
create-turtles 1009 T0 ^7 v/ J& e* G4 x9 K" V
ask turtles [ setxy random-xcor random-ycor ]2 U( f. V" k4 S1 i! }
end4 ~0 h5 o) G: |
to eat-grass( b" _5 `6 u9 H- @7 X1 _: d9 X
ask turtles [5 a$ f1 h t* E3 ?
if pcolor = green [& u1 |+ Y9 y! Z! e
set pcolor black
0 S: G4 q) k6 k2 r* H- H. B7 a set energy (energy + 10)
( `. i- g3 @+ Y$ s% }# B$ E6 {$ d ]" k( I& D+ {1 u: g; E
ifelse show-energy?
4 v9 m. K9 N$ b2 b9 K c [ set label energy ]
. N8 I6 ?$ H4 K0 w [ set label "" ]
+ X- u& q4 E- o6 l ]/ P0 {6 L+ h, x& Z9 r
end
* Y7 v2 ?2 U6 h3 w# Oto reproduce4 F) Y+ G. F& E* M; h. R+ ^
ask turtles [
& j$ T; M7 k9 D7 ?8 Z1 a2 O if energy > 50 [4 w, ?; U) ~( U$ s- l( l# \- p. C" E
set energy energy - 509 u1 A$ s. J+ [! K& C- Q7 N
hatch 1 [ set energy 50 ]* U& A# v0 e& N: _! g" E1 ^7 m
]
1 r7 o }% G7 r3 ^: f; K/ Y; F ]
; W1 H8 _2 @- Y: \( y0 Fend9 a& q6 p& Y8 M) o- I- E
to check-death
3 D* i) }% [9 n. I$ o ask turtles [
g( `, d7 s- V5 P6 z0 A% g if energy <= 0 [ die ]7 u# P6 M Z! H n! j: f" U n
]
5 b% O' ^: J( G) p; q2 I" Pend
) d; ~& E, C0 w/ Nto regrow-grass' d+ L9 l& C7 |: q- R$ {( v( V
ask patches [- f' J3 ^$ J! M
if random 100 < 3 [ set pcolor green ]: b/ b" Q k% p6 y
]
7 Q) e5 g! M$ B5 Nend- h) Y# H( x! Y3 y
to do-plots; t; F) i+ i: [3 N1 S
set-current-plot "Totals"
5 j, A6 U' A9 Q7 P g set-current-plot-pen "turtles"8 G2 R. m T g
plot count turtles* k' j% u2 @2 c0 g- A
set-current-plot-pen "grass"
; {! g0 R* m2 G. O' a) w" T plot count patches with [pcolor = green]
! b- s. p. Y& nend; I( x' p. j ~4 v% q
可是运行时提示no such plot: "Totals"0 w( I) z9 V0 T. `, d' |) c C4 P( t, B
error while observer running SET-CURRENT-PLOT- i, n* h# o# e, P. B" s. A* |
called by procedure DO-PLOTS
4 L* m$ V* w$ @2 w called by procedure SETUP' d) y/ E- {. }" d3 c% r
called by 按钮 'setup'( |) [5 z( b/ Y1 g4 N4 R% t' J+ ~
求大神解答啊 |