我编的程序如下turtles-own [energy]" x4 \* s( u- z) \+ c8 b
to setup
k1 {: O0 _+ g1 o7 R* X: H clear-all( h* o* {5 l( K$ _
setup-patches
8 b4 a: `- Q+ A* I6 c1 \! Q create-turtles 100
6 [8 b/ C2 o' r' k9 o/ `( B do-plots# y5 q: G: X5 Y+ V! X' j1 o8 J
ask turtles [ setxy random-xcor random-ycor ]
& Y$ a, Y6 X/ j3 R# N$ y& y7 rend
9 H: v* [4 K0 E; M+ E0 `- Mto go
6 R7 Q' r% w+ R1 I move-turtles& n. S/ l g8 b6 F# a7 ^
eat-grass$ W/ u3 ?& q1 G% S
reproduce
* ] h6 C* T/ ~; t check-death
6 A7 T, p5 t8 y regrow-grass! k; q7 r9 x& V3 x8 C$ s* m& {9 y- d" w9 y
do-plots) Z: V2 b6 d! I0 | O& _+ `, b
end
; \0 w) i- ?: w+ w: k6 Mto move-turtles
& {9 y& l$ o# E% W$ m; G0 a ask turtles [
' [& L$ S5 `- c0 s. |) s right random 360
8 L. W0 l" ^( _1 c% @; o( s' n forward 14 e1 g, Y7 E2 c; w
set energy energy - 1
8 w4 \, I& f+ @ ]2 \" W2 G. f: p
end
. S7 n( t+ m5 z: G8 x+ X# y( O7 Lto setup-patches
4 `4 n& D7 Y$ t+ I }6 y( \ ask patches [ set pcolor green ]
* _6 n L& r/ M# cend
) u0 s4 F2 M9 A( O' Jto setup-turtles
$ {! |3 X7 S2 k' L% N; T" _, I create-turtles 100( E- \' n, r* I \1 Z" z/ y
ask turtles [ setxy random-xcor random-ycor ]# A! Z" U3 `0 }* K- [' c! R
end4 K2 g' Y: i) e, E0 H! w: |" b
to eat-grass# q' J$ [8 ^% S; C: [! u+ H
ask turtles [+ u. M% p6 }% c, `) B/ ?7 E
if pcolor = green [8 j7 b1 Y5 `3 p% k B
set pcolor black. p# b+ q) n/ A+ N! Z9 x' P- D
set energy (energy + 10)+ h0 `* q k i/ x/ L& y
]
P$ b" U, b9 z; E" z4 I ifelse show-energy?
0 k# y2 t5 f' Z! Z/ _+ a6 P [ set label energy ], U4 v2 `1 X# O0 T4 u+ E! }
[ set label "" ]; o6 S1 E$ J( `7 {, g/ P
]
/ X5 b# k/ Q- `+ H) S1 m9 B: `end
; r7 j& C1 u* h! W$ Z# z+ Nto reproduce
6 y$ ^# E* e) ] ask turtles [/ ^% n+ j8 ]% b9 C; D8 T
if energy > 50 [: E, z: F3 X4 Y$ P$ W* H
set energy energy - 50
: y. u4 l' `* s: E0 g1 a' T* A hatch 1 [ set energy 50 ]9 P0 c$ X) u; G
]
, L1 Q" K! X- i4 J: c8 p ]
4 C. v8 k; p6 q6 j0 _- b; s/ wend
: J3 ~5 D8 a& m/ c' @to check-death
/ t, `& J( x! G5 t. I* `8 T( Q% } ask turtles [- u# M" G1 G* l7 K
if energy <= 0 [ die ]
$ @0 j/ b' R. E: A$ U ]
8 _( G5 ?' C: M5 m6 \) Jend
- O M* H6 w0 u- K1 Wto regrow-grass# K' ]9 v/ \' Z: c& N7 ~) a% q
ask patches [+ d4 A! W! e" E
if random 100 < 3 [ set pcolor green ]
+ R/ n n4 M/ H ]9 J+ y( ?) B( J
end" ]$ C8 r7 P0 k) Y
to do-plots
( ~" i3 b! A |$ l set-current-plot "Totals"
- _, o* z# F: m& I$ s set-current-plot-pen "turtles". J. n" `8 c( u0 Z; ~
plot count turtles
+ V0 a2 C; ?$ ~/ U% h8 D, e set-current-plot-pen "grass"
: |: O% _6 g, |' W: H# F2 G8 r& s plot count patches with [pcolor = green]* ?! u7 E7 }, k9 Y4 g3 B
end0 Q/ F0 \2 r. r6 C* {
可是运行时提示no such plot: "Totals"
" o! v% F( _" h2 eerror while observer running SET-CURRENT-PLOT/ [% s2 y; j# Z8 T+ h* D
called by procedure DO-PLOTS
i: Z$ ~8 \% E* h$ M$ l called by procedure SETUP+ @1 [! d0 f2 i8 q5 |5 y0 {/ z# k
called by 按钮 'setup' m6 I3 \7 {" \9 x- F8 e2 a: J
求大神解答啊 |