我编的程序如下turtles-own [energy]% o1 @ f5 @. b' K# H
to setup* x0 A! E! X7 H: g* U$ l
clear-all. D9 x" u. w; @+ \6 J- Y' u. f
setup-patches8 u+ l' {" w) S1 i
create-turtles 100
+ V9 L, z; J$ m6 P9 ^ do-plots
; J/ R' x$ C& y" ?4 t$ Z ask turtles [ setxy random-xcor random-ycor ]: C4 {0 ]" K4 f1 E |" x2 e
end: F( x4 a. _. `6 S' c$ k4 K! F
to go! E' V; k# T r9 c3 k
move-turtles: }0 N5 V" ?; q
eat-grass/ j! @$ W6 d) o1 W
reproduce' k5 U- Z2 i# G2 W4 A
check-death
$ Y0 r% h9 H/ N$ S0 v. U: a _ regrow-grass
3 J3 {) l" y; ]; U* d3 I do-plots" N. O' d5 s' `2 O
end" b: @3 @+ t ]5 I5 ~1 o
to move-turtles* ?+ N) r6 K! y% s3 R; o* G
ask turtles [
) u) N3 _5 \* D% e! i. M* \2 |* B* W right random 360( X* h9 T5 ~: o' v
forward 1, [" N$ W; j3 B$ |9 @% R- E
set energy energy - 1 c" a; I7 K+ t7 P) @' Y
]
+ }7 U' y. d2 z8 e9 ?) f0 _+ O; n6 send) e) L9 J# g* P6 Z
to setup-patches
% a, F6 x2 L; ^) v; R! P+ a7 { ask patches [ set pcolor green ]
7 e. n4 b2 A% i3 _. B5 a+ c3 I. Hend
: d* b& x7 F3 h1 r& }/ nto setup-turtles" \- O4 Q {0 u
create-turtles 100" @( ?) ? P- }4 j' Z4 Q; X' O
ask turtles [ setxy random-xcor random-ycor ]# B2 Z9 o8 `6 G0 d \+ @
end5 [) L% P4 k4 ]4 z* i# E# q
to eat-grass
( H. v6 |& X% e: k# u. F ask turtles [ p4 r9 U3 [; s' r5 O$ ^ W
if pcolor = green [' s9 j4 E7 ~: ]9 p6 A
set pcolor black/ R9 g3 R& \3 ~6 _1 O1 w
set energy (energy + 10)
& O; E: n" A) _5 N# Z ]2 w) i% ^4 [9 e/ }) |2 u+ x
ifelse show-energy?8 \. H6 v0 {8 H
[ set label energy ]
4 P) c+ n) y4 n [ set label "" ]( [) d+ F! b9 r3 B
]
& S" i3 r$ N$ T3 h( m. C9 [4 T" rend
( E2 d. f! T, } W& L6 S$ pto reproduce
+ ?. w2 z; k% b% k ask turtles [- }8 e% {0 Q' a
if energy > 50 [
0 w7 _1 r n. l. d set energy energy - 50
" X( i1 t: k- e/ _' E0 ?! ~2 S hatch 1 [ set energy 50 ]! `9 h( G2 S3 O' v/ M
]
n& ^- F1 j" @- v. n" M: J ]' V/ y5 \5 U2 P7 ~8 O7 G# b; }; |
end
: i' V% E5 y) v% c8 | rto check-death
" q" v' R" k" k0 T; q ask turtles [
8 b h3 G2 ?9 k r6 P' Q1 [* ] if energy <= 0 [ die ]
9 I' g( l: |' q9 D ]
( p9 Q8 e E9 R# j" |- qend
; c9 F8 v; ^' F* c% ~* Yto regrow-grass
6 |( Q" t+ W* v ask patches [
, o. s, @% p$ R* m& Q if random 100 < 3 [ set pcolor green ]
b6 }0 \6 }& Y ]
! V( R5 d, [# u% n& O# K" rend4 M7 Q# J, f, G6 U& `6 h& O
to do-plots
- L9 r+ }; f. X1 H: Q- k* o2 D set-current-plot "Totals"+ ~4 J8 d0 d; U& W/ _8 K6 m, j5 C
set-current-plot-pen "turtles". P: ~1 q/ n% W
plot count turtles
1 o1 F- X$ d; J9 F# { set-current-plot-pen "grass"2 z! H0 l' T) n
plot count patches with [pcolor = green]
H: q7 S% c9 |* J: e" q0 _0 P/ y# lend ]0 R( }7 K3 |! `
可是运行时提示no such plot: "Totals"% t; T- J. N# T' ^& {" e" ~, ~, O
error while observer running SET-CURRENT-PLOT( i, A2 B* ~3 ~. P6 H
called by procedure DO-PLOTS1 L$ x+ T. H) p7 ?
called by procedure SETUP5 ^ E$ A5 W6 `
called by 按钮 'setup'
% O+ d% o0 ]6 S* ^求大神解答啊 |