我编的程序如下turtles-own [energy]
- Y! @) N+ T; Z/ e) Z( ]# |0 Z z3 x, `to setup4 m' r. N3 |3 |+ e$ |
clear-all7 {! Q6 E( j! x1 s& P2 G9 C! p
setup-patches) c+ ]4 d8 p1 T0 a. d
create-turtles 1002 B" Y8 U/ [* G4 I9 w A. e
do-plots
- A% C& e, @+ S0 R# J4 s3 P: L ask turtles [ setxy random-xcor random-ycor ]
8 ?2 ?9 f" [+ b- S6 X7 `! x* Lend1 x+ r4 W1 U5 @/ [3 X) U
to go
* z1 z; k- V' D7 \/ A! N move-turtles: ^. a3 @; U. e: m6 O7 Z
eat-grass: z! b9 h4 g! V4 f, }+ D8 d
reproduce: {" P" i x z* V+ d# Z& q
check-death
z) c/ L r5 j! P regrow-grass
0 o! S9 h( W, i, H% R0 b* W do-plots
3 B8 O8 t# F& x) X1 \end
& a" p* c/ h* ^) O# n% mto move-turtles
' ^& F4 E# W- ^. K. i ask turtles [
. B& V+ K# }0 g right random 360
/ |- [; h) T4 s1 H forward 15 b! C: b& k: k0 [
set energy energy - 1
& O( }8 M* V$ x" f% _" f! C ]
) k! ]* o% y1 s8 a+ h- L* O- R* }end
# n& S5 B0 ]5 l0 ^to setup-patches
" \( d Q( v z2 H ask patches [ set pcolor green ]* ?# @& L3 R& F0 y- B2 V+ ^% K. q& `
end
" U) c* q7 l7 r. j P Cto setup-turtles
7 }5 P1 @; |5 F1 ` create-turtles 100
. X4 @! v! I% {: W d ask turtles [ setxy random-xcor random-ycor ]
) ^4 E- v7 M5 ^8 Y# |6 x0 {& fend' d1 G' _1 u2 r6 Y
to eat-grass5 w% z& `; Z4 l
ask turtles [2 P0 ^6 r+ R6 q; E' u( g' @0 v7 n8 B. X
if pcolor = green [+ v8 Z0 y8 M1 V3 m* E+ z
set pcolor black" O7 n5 W% n* u. @+ J+ {
set energy (energy + 10)
8 u! H. s8 _2 D. F* x7 s: {! z ] N0 t ?. J) R5 u
ifelse show-energy?
6 Q" q7 F+ s9 V" p8 j [ set label energy ]
4 s' h& q5 c2 M [ set label "" ]
; T, T2 k" v4 P1 i1 d0 s( O: E ]. h# {% {/ r2 H. B
end9 b/ a6 F( {, e1 U" N
to reproduce
+ @: y, o1 W: Q% M' g q% r# j ask turtles [
G- g0 e3 N M if energy > 50 [+ J V0 J4 c& ^! E/ j
set energy energy - 50+ Y# G6 U, s7 |7 |5 j
hatch 1 [ set energy 50 ]; J$ R6 Q6 _ s: V6 l/ ]
]4 [, N0 N2 g9 v) `7 d
]
1 `* f5 P$ D2 v$ {9 a7 A' f; k2 Iend
5 F/ j1 p4 u( U: b. J2 Wto check-death
4 h/ ?4 ?8 u1 f6 M9 H ask turtles [
" G0 S. Z, L5 g$ r ?1 e if energy <= 0 [ die ]
+ S. b3 ~2 r4 Y1 t0 p+ ~+ [ ]# Z6 o5 y( E: e$ U! ?
end8 e8 J# J* ^! r! g8 z
to regrow-grass1 C0 n$ W1 H3 {# K( ~& [
ask patches [1 ^0 h! H3 {( z |% X8 t2 o; ~8 V0 H
if random 100 < 3 [ set pcolor green ]
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end
. u4 }: i: {% k7 q* Qto do-plots( P) I' v* B2 q6 i/ p
set-current-plot "Totals"
7 ~" T* {5 ^; J! p* p2 ^ M" R set-current-plot-pen "turtles"7 ^3 I' @( o6 J; R
plot count turtles/ ^0 u! e( e c1 S5 } J* ]
set-current-plot-pen "grass" o( ]6 [2 V( a M( O. W
plot count patches with [pcolor = green]" Q9 P: W% f1 j$ J
end
7 `$ e$ m& U. I可是运行时提示no such plot: "Totals"
- B5 t9 E% P; d, E& U3 f8 Ferror while observer running SET-CURRENT-PLOT
+ v% R# ]* \9 U8 \ called by procedure DO-PLOTS J% ~# }, z) ] X% b6 `5 i! k
called by procedure SETUP
$ \% n: @; K: C8 }( u/ u2 { called by 按钮 'setup', g/ i. N) m5 x/ b
求大神解答啊 |