我编的程序如下turtles-own [energy]$ D: y, P- ~4 u8 N( h! T9 F
to setup
* V- C9 k5 s# v+ L% J clear-all2 V8 U0 u! I" k) T. P
setup-patches
0 O9 S, m# B$ e; e# d+ X create-turtles 100/ D8 h" f5 Q% r2 O
do-plots
; H# N. Z8 ^/ ^: W* O! C8 S ask turtles [ setxy random-xcor random-ycor ]
% b6 j) X. X0 V0 Uend# E. ]8 H8 }0 t* s, z
to go
. ]9 b: E- |* a0 P move-turtles1 w4 l0 Y% I* y. `
eat-grass
/ O$ l/ a: Q6 E& n4 N! d3 x reproduce
0 p5 ]/ m. Y4 p4 F0 b# w check-death- v j4 ?. w+ f/ d5 s: |
regrow-grass
: G9 q& Q$ \( o1 @0 _: C, P' G do-plots
9 X. k0 G @5 yend* [6 N4 [6 D, Q) E) @7 u- t
to move-turtles
" s0 L3 b9 v- r* w& d# B8 P- J2 \ ask turtles [5 s( U& J1 F2 J, U% r$ }
right random 360- J, o" k+ Y5 S$ ^1 H
forward 1
. _& R& Y" s7 k7 M- n- I set energy energy - 1 F9 ^/ E' v: h" p
]4 q; Q' U: U& I
end/ x+ t" [- E- k
to setup-patches
* }5 i& L/ q5 E' u9 j" E0 F ask patches [ set pcolor green ]' l/ W. _0 [6 V% p4 w) G; k
end# B. d& g7 i+ c, a+ f* L
to setup-turtles
7 W/ h. \8 o; m create-turtles 100
+ F% N1 r) {8 b1 L3 y1 [$ M& l! _* k ask turtles [ setxy random-xcor random-ycor ]5 ?. y4 G: S' V/ K5 k( a2 k
end
2 h p8 g" @4 ^) r& z9 w* {9 A* _" { }; |to eat-grass4 T) B( k) s: {
ask turtles [
# U+ F$ B/ U: @. u& k9 S& c if pcolor = green [
3 J0 f- C% R- k- @. M9 y" O7 t- c set pcolor black/ h a8 N! l( z% n) e6 j3 U
set energy (energy + 10)
/ b/ Z& t t( ^. }4 w5 o3 f" O& I ]* C/ q4 O- _ _; g: d
ifelse show-energy?
* H8 I; ]" Y4 q4 `8 V/ j [ set label energy ]1 a3 W) K2 N! x, f% R+ s7 P
[ set label "" ]9 g) P+ U, K+ N% ?5 a3 h
]
3 e- ?/ {7 h Q0 x! V! y- j! r, Wend. }% D5 Q( ~/ o/ O8 ]4 S
to reproduce& R3 w3 L8 m8 K2 S6 `; n1 j9 b
ask turtles [
" F* N; L8 J* R k2 k if energy > 50 [" l8 N! D7 L. ]7 K/ z% I
set energy energy - 50
* M0 m' n+ {3 H, L3 M. y9 T hatch 1 [ set energy 50 ]* K; A# \2 K) t/ P* T' C
]
( v+ S% c7 Y- D ]/ {5 ]3 D' q6 {9 S6 ^" c
end
* l5 E9 h& t, [$ c% \& f) S9 ?6 Bto check-death
' N2 L- n5 \! k( y2 s) y ask turtles [7 M2 r& S" I% I
if energy <= 0 [ die ] [: K! f" ~1 ? `
]5 o8 o( H3 V& x2 O1 q5 ^( z8 f) o
end
/ l2 R% @$ ~; w7 a5 qto regrow-grass
4 {# ]! {; i/ r: L* x ask patches [* `4 q, h' C1 Y4 d6 c+ p# P) r6 ~
if random 100 < 3 [ set pcolor green ]
/ n' `7 N g# b" }% ^: Q7 q9 `: ^ ]+ z N2 V8 q* A% i5 J; ^$ z
end" U; L: ^$ Z' \$ b
to do-plots3 q: Q1 ?( h3 Y5 A' g! w
set-current-plot "Totals"
6 _* c( y9 u, R. G4 X$ Q set-current-plot-pen "turtles"
8 J& j: Q4 V1 a3 X! t/ U) v plot count turtles$ \# ^& U4 o! f0 h$ X
set-current-plot-pen "grass"
; R O5 H6 h8 R W+ |% ~3 e plot count patches with [pcolor = green]: @ j1 E7 b0 W' R' d6 p2 \- R
end/ u1 R1 D- A0 v
可是运行时提示no such plot: "Totals"
8 C$ S: r8 S8 p, y: j* n$ j) ~, A3 oerror while observer running SET-CURRENT-PLOT# e! ]7 A- e2 o e5 S( s
called by procedure DO-PLOTS P5 O. u8 V/ `, A8 ^5 R2 w6 X: B
called by procedure SETUP3 S" B' A6 `) J# V! a: [
called by 按钮 'setup'# L- j0 b) K) a7 {9 _
求大神解答啊 |