我编的程序如下turtles-own [energy]
: U3 Y& e2 z1 \ a- k# gto setup G6 `6 |0 u. ^7 Z3 e7 C
clear-all8 m& r+ k5 P3 G- @4 L) _# G/ v" U
setup-patches
* o4 V, }% I3 \7 C( K create-turtles 100) g% @" F9 U4 I+ k2 K
do-plots
. F- `: s9 g9 f6 |8 W ask turtles [ setxy random-xcor random-ycor ]# K; U7 I; Z. u4 ]) o
end* L* f- O/ a7 S0 f$ Y
to go3 I! X4 H. C J
move-turtles' r' ]- q) g1 w! R
eat-grass, a& A% P% ?2 k: X" a# E* i
reproduce- a3 i. D5 Q4 S3 s( t+ @, M5 W/ P
check-death6 E8 h$ d+ w& s* y; ]
regrow-grass
1 f y/ \/ f, s$ P do-plots
. h4 i* k! c, D& uend1 o& D) d. A% Q4 Q4 k! U0 O
to move-turtles
2 R+ q/ [% `& T H Y* x; Y* z ask turtles [- z# f m) g; C& |7 ?2 B9 E
right random 360) _3 E2 p1 v. v/ a2 r: U5 e
forward 17 C* j( f. W% t: l
set energy energy - 1+ v' }- l' v* \9 w0 v* W
]7 }- X5 ?# N0 R; e/ y; W1 \+ d
end5 X0 O, y O _$ [
to setup-patches" V+ V1 w; r- ?$ t7 f
ask patches [ set pcolor green ]2 u( a7 ~3 r% W4 T3 H. {5 A [/ p
end
/ C: R4 c! [" N# S/ S& Z9 Z8 Ato setup-turtles
7 ~8 K. C' Q3 e4 p create-turtles 100
: R0 ]& Y6 W+ C _ ask turtles [ setxy random-xcor random-ycor ]1 S: r: r# u* S; W
end) J) Y7 H0 [2 W# M: ?
to eat-grass
- u9 W. _" w5 \* d* {4 G' D ask turtles [# i) ^: A U4 U# i- x& Z; N
if pcolor = green [- N% t$ |. I4 M
set pcolor black
/ c" R" y; u6 f2 N set energy (energy + 10)
3 T. y( y8 E" a; F% C ]
/ o) Z& j$ h+ I! G ifelse show-energy? S; C( y" F, }2 K4 p9 c
[ set label energy ]
0 K2 E9 M& H! v; R5 D, K" h [ set label "" ]
2 g: H, W# a( h ]
. q8 ?+ Y5 ]0 p# m8 gend8 |' y, y1 @0 f, O: {& O# l# O6 }
to reproduce; t' u6 Q' s* J! s
ask turtles [, {1 F; V5 E% A5 M# R
if energy > 50 [$ U1 I/ ?. a3 B- a3 L% n* Q
set energy energy - 50
' |; @/ X6 r! f- L' } hatch 1 [ set energy 50 ]% t6 n/ m! w% i, s
]
" I. y6 c/ E/ a( u" d; [* e: ]2 v& o ]
9 D% q" |! E6 y0 [1 G% vend( B2 M% p. j1 \- ^1 K, p
to check-death
: E! O* b; L6 l: c ask turtles [) ~: I. a! S0 f9 j
if energy <= 0 [ die ]
# y9 H% v5 K/ _8 o4 m ]! {) [" v9 U( M+ O/ A" ]
end5 B2 J( ]' j3 I
to regrow-grass% ?- @0 o: l! ]8 V& X! I4 x
ask patches [% ]5 @! ^5 x& ]8 d0 O
if random 100 < 3 [ set pcolor green ]
1 r6 s8 z6 V- |9 P ]3 j Q% l9 Z2 K# s5 a6 C
end
: K$ N; V2 f9 I8 Z, E- Mto do-plots- D- U" W# l" w4 d/ M
set-current-plot "Totals"
1 u# K8 }+ t2 G8 w* C v8 f" @) p set-current-plot-pen "turtles"
i. V* @7 n) f6 g U! Q3 ^ plot count turtles6 Y6 ` F3 }' P0 I: N; t; u
set-current-plot-pen "grass"4 H# o7 A5 e9 I' n( p
plot count patches with [pcolor = green]( i/ h5 Z/ z* c+ o' f6 B
end; a. L+ U- @) \3 B( `- h
可是运行时提示no such plot: "Totals"
9 @, Q6 U, Z& F. merror while observer running SET-CURRENT-PLOT
6 u' ]: C" {0 X( o' P$ _) S called by procedure DO-PLOTS4 { z1 c) H9 f6 `
called by procedure SETUP
6 L& B! F; c2 h called by 按钮 'setup'8 }& T3 H1 A/ A J' J
求大神解答啊 |