我编的程序如下turtles-own [energy]; W, J# ^8 E' ]
to setup
$ i; y: w+ ^ X5 l clear-all
4 |. Z- D# s% e9 Q) q setup-patches
/ d6 g. n( Y) ^+ T7 y create-turtles 100' L! ?# X6 }2 o
do-plots" v% R7 ^1 j2 i A
ask turtles [ setxy random-xcor random-ycor ]
; @& r3 u2 @$ x7 Rend
8 G$ l# i+ y& M- I ~to go# | w+ ~, [3 m& V! F
move-turtles
2 q4 u/ {8 X' R2 A- _ eat-grass
' O5 v. ?1 o' T0 A0 l" G reproduce
+ [0 o6 y, Y: t; a check-death2 G1 x. G1 S$ E4 f' [
regrow-grass! E1 z- ^) k) O/ `+ _ c
do-plots# q6 @5 ]. y! o8 a# B( ]) {
end
. O& ^& V" X6 | {to move-turtles" Q, [3 m; \( P) ^9 t3 |2 B
ask turtles [+ e7 y; {9 H. i1 q/ Z4 I; d
right random 360
; O+ U( T* K$ g( x forward 1 G; b0 g. F# _
set energy energy - 1+ a( n1 a3 V2 F4 |$ J
]) k' x0 e; O! p: H5 N
end
3 K: m' o# i1 Hto setup-patches O1 b& c2 w6 [
ask patches [ set pcolor green ]
& W! _( U( f( }2 v$ `0 L! Wend
. i8 q# @: `$ a" h/ c" |, [to setup-turtles( [9 b3 {0 k$ ^
create-turtles 100
( k* C+ K$ [! n V5 [$ N0 J, J V) u ask turtles [ setxy random-xcor random-ycor ]2 F b+ o: A8 k" Y0 D
end# l$ V/ o4 I3 ^' ^8 b" { O
to eat-grass0 }# ~/ V) P4 a; X8 [ f
ask turtles [
8 U3 \7 _1 h% k& y1 T( g3 p n- m if pcolor = green [
+ V8 y$ W6 }; {* g: n7 g4 b set pcolor black, I& ?: o) ]0 a8 {2 _3 d+ c, N
set energy (energy + 10)7 d" @. a1 U/ p7 H1 ?5 e% U; Y
]
5 h f" [# ]' S9 N ifelse show-energy?
- y* Z0 }$ Q* E) o0 A% S( J [ set label energy ]8 M" k/ \6 t2 }2 Q+ v0 M0 A
[ set label "" ]
" z! B' H" A1 F2 B- t. h ]
' ]- R" R2 o3 ]. Yend
" N3 [2 a: ` C( i! C9 eto reproduce" n8 C, @7 X+ r# M2 ^3 R0 Z
ask turtles [; {# g3 H% `1 O. O% Z/ B5 J
if energy > 50 [3 u9 G4 M+ ^/ |- L* q
set energy energy - 50 B2 v* y( y& w
hatch 1 [ set energy 50 ]3 H; W+ u0 m9 T# n P1 c
]2 P" t) W% @$ x& T# C
]" O8 G3 t: K' J2 n" Z/ O
end h s, m( i# {! G; z x
to check-death+ m+ D9 j8 m& H" _
ask turtles [
5 g' {1 K8 D( @: P' }9 F/ t if energy <= 0 [ die ], B/ x; t- v0 ?& H/ h% `
]. y' `7 D# `) k. y
end
) X8 c. O- {/ @' Rto regrow-grass- M% |% e6 I: u- p. F
ask patches [& F3 R* i- {8 N, _
if random 100 < 3 [ set pcolor green ]
4 h; X+ Z& v/ p$ s ]$ _; L0 h; K2 J: q( B$ d. s% s9 y
end
7 s& @4 ?. m7 f( uto do-plots+ M( \1 A3 ~: f
set-current-plot "Totals"4 [# a5 _! B( o5 J7 f) k
set-current-plot-pen "turtles"
% q3 a6 ~+ S9 ~) \ n. `& R" f plot count turtles
/ d6 o Z$ n9 p- j& d8 [ set-current-plot-pen "grass"
! q9 [: L6 m6 \- S# t plot count patches with [pcolor = green]
K3 `( ?- x# h' Tend& K- Z6 x" p# p7 m) l3 {
可是运行时提示no such plot: "Totals"
. U6 U: h3 R8 C0 Terror while observer running SET-CURRENT-PLOT
% e- L4 |& z' I called by procedure DO-PLOTS9 O0 ?0 |, m2 u- W g
called by procedure SETUP3 ~8 s% }- V% y8 W- H4 f0 x
called by 按钮 'setup'
, |% e) V- E. T/ r. N# C9 \+ H求大神解答啊 |