我编的程序如下turtles-own [energy]' t) p9 h, ^2 n( y E
to setup( T+ e2 e; `' _# ]0 e2 T0 \
clear-all- Y3 N$ \7 k0 W
setup-patches) @( z: b2 c6 m' C- T9 q3 G% k9 G# [
create-turtles 100
, _* Q4 N6 V! `: I8 V$ b do-plots
- h5 G& |# o( n ask turtles [ setxy random-xcor random-ycor ]" m: j8 J. s. W4 W# s: L
end
( t! D8 a% ?1 y+ A8 Rto go3 w f) W# z9 n. l
move-turtles7 T& f* F; M4 c! o
eat-grass; g! e& a/ d" {; P
reproduce; w" L, A* G) s) c) I- z
check-death
3 t+ \( v8 h9 e# \/ J regrow-grass
1 q5 t$ D! {/ ?* @5 R9 g2 W: h do-plots- a5 Z+ y5 Q8 ~1 \% f) B8 j
end7 ?' r" j" @, c1 y5 ^
to move-turtles
2 W- R$ m! [. L. X( P ask turtles [) s# t2 y( |+ [9 m+ F. \& ~
right random 360
5 \* K4 f% h8 L8 Y2 V/ F forward 12 I0 v8 Q: F. j& J! A' i' m
set energy energy - 1
5 _) {* X2 o1 ~! [. o+ ? ]3 A) s$ m! i' q; ^$ i, W6 b
end* b6 @/ | w" k
to setup-patches$ r5 i# Y" z4 ~7 y/ |
ask patches [ set pcolor green ]
+ k+ m' J! ~# X7 eend. ?) w6 L+ z7 J7 P" \
to setup-turtles) u5 u, c/ o% D0 ^4 p( s
create-turtles 100
$ V4 {' O R$ T ask turtles [ setxy random-xcor random-ycor ]
1 r$ x! C; C% h C! `# {5 @2 hend
9 M& g7 r+ G; R$ S6 {% D' ^to eat-grass
5 J6 ?! m( K( z3 @) \# y/ u/ W9 l ask turtles [1 c8 U* O0 X6 \3 j
if pcolor = green [. ?* f" Y6 t ^2 e/ h' a1 l9 A3 R
set pcolor black. X5 { N) w8 h: S: I; X( ]
set energy (energy + 10)
; i& T! a: e4 n4 T7 o2 m4 d+ k ]
5 _' M( |' o. D; ? ifelse show-energy?& a: w E/ ~* ~
[ set label energy ]
) j6 J: b. n3 L( h, `+ M8 v7 J& [ [ set label "" ]4 M* H& v) y; H
]
: Z: i$ T! J5 o* j+ \) @" Vend% K; c6 A. ^3 m
to reproduce
5 a1 w4 x0 g1 Y3 g3 o6 P6 } ask turtles [
. I6 S! W2 o+ V" d5 c if energy > 50 [
* d6 l1 I1 ?4 N& _ set energy energy - 50
% B5 Z0 [2 A G" l/ Q8 H" C! [ hatch 1 [ set energy 50 ]
; G/ d; R3 x- K$ D% w ]
8 d& \9 _% m; @* g% e, X" C9 v ]
1 K3 W) w- y, M3 \% V9 W7 yend
$ e( Q9 D* s9 h% pto check-death
2 j0 C: N+ I' \7 b ask turtles [- p) `) e3 S0 O: G
if energy <= 0 [ die ]. A0 l4 p# q6 a* V
]$ {1 l* `+ P6 n& Q) F" c/ K
end
/ _% h' J, ^! F' K& k5 _+ jto regrow-grass
( d% ]& X1 u ]: O- | ask patches [
# v8 A7 ?2 k! F9 P if random 100 < 3 [ set pcolor green ]
9 e6 s2 w# ? ]) ^# |$ Z' @ ]+ h9 Y+ _3 ^8 d* D! Y# W
end
. x: _) Z" E; N: N) T$ M" Pto do-plots2 H# g' N- V5 `( _
set-current-plot "Totals"
$ {8 W% G2 s* N5 m# L) o set-current-plot-pen "turtles"
) c4 N9 r7 G2 o( P) ? plot count turtles
/ Y7 d; |/ b9 p# N9 v) c0 l set-current-plot-pen "grass"
2 V( F( g+ I7 \3 X4 s plot count patches with [pcolor = green]) H9 x' E9 Y8 K- E; J: F! e. G0 Y
end" t" j) _) v: C% K2 l" V3 u8 z. M
可是运行时提示no such plot: "Totals"
' N; o8 m; M% ^3 {error while observer running SET-CURRENT-PLOT% y4 S S% {6 c' O' `
called by procedure DO-PLOTS
1 I& E. S n4 w2 ` called by procedure SETUP8 D: D/ S* T2 g1 r! O/ d
called by 按钮 'setup'
& o8 q+ V. `2 F, d" V) F. {求大神解答啊 |