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新手,在看netlogo自带的例子时,有几行程序看不懂,希望高手能够指点。
: ^2 l2 s0 s6 X1 xnetlogo自带的social science--traffic grid这一例子当中,
& D+ e% n# U1 e- l! Qglobals* E- Y2 T, ~+ W
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grid-x-inc ;; the amount of patches in between two roads in the x direction
& |# N( [4 n" m# U, P grid-y-inc ;; the amount of patches in between two roads in the y direction
0 F1 S! P+ `3 R acceleration ;; the constant that controls how much a car speeds up or slows down by if! l8 g# |" z% Z9 H
;; it is to accelerate or decelerate8 n8 _( H" [; G" Y9 o
phase ;; keeps track of the phase5 K r: h0 F) n, h
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure: ^, |/ {: j& e0 M1 Q0 ]9 M
current-light ;; the currently selected light
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3 \5 n% C" X5 q8 s" _2 H6 O6 n2 ^ ;; patch agentsets
& Q$ s$ s" x. f% ? intersections ;; agentset containing the patches that are intersections
6 z% H, ?+ r1 t: P roads ;; agentset containing the patches that are roads
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turtles-own
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speed ;; the speed of the turtle( I$ O e, ~- f- v6 U
up-car? ;; true if the turtle moves downwards and false if it moves to the right4 X. F/ J: ?7 U" @& z B) N [
wait-time ;; the amount of time since the last time a turtle has moved% _+ n8 W' W! V; k6 T% X
]
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4 }; L4 g9 b" \patches-own
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intersection? ;; true if the patch is at the intersection of two roads
4 B4 F+ f+ N8 s green-light-up? ;; true if the green light is above the intersection. otherwise, false.
) @' d0 ~. z" X- p ;; false for a non-intersection patches.$ q2 u7 \* a. |
my-row ;; the row of the intersection counting from the upper left corner of the8 R! W& L( h! W8 i1 D, e* y. i
;; world. -1 for non-intersection patches.
: ^$ p" \4 u7 J1 {) i1 b my-column ;; the column of the intersection counting from the upper left corner of the- c" \4 S9 z# |- ]
;; world. -1 for non-intersection patches.
+ X1 p, V- K' ]1 n% c my-phase ;; the phase for the intersection. -1 for non-intersection patches.2 u# e7 R/ S- n3 F q$ g, W
auto? ;; whether or not this intersection will switch automatically.
& h2 L2 R! p" C m8 S/ ^ ;; false for non-intersection patches.
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o4 ^" v; |% N7 I' Z;;;;;;;;;;;;;;;;;;;;;;
- Y- b& X4 S7 C& m8 Z2 `;; Setup Procedures ;;2 `% L1 G' r6 ?4 J ?
;;;;;;;;;;;;;;;;;;;;;;* Z/ f, F$ B4 ^( ` M% t1 T+ A4 u
; r2 M1 t8 v) R4 B;; Initialize the display by giving the global and patch variables initial values.
3 b' S9 c. e) R: q2 r& D;; Create num-cars of turtles if there are enough road patches for one turtle to
! H: o1 [) ]; U% h3 B;; be created per road patch. Set up the plots./ F" l. P2 P1 q$ m/ a
to setup$ }/ g5 }" m# O M' }
ca
4 i8 S C5 `3 f* W q v setup-globals
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. p' H# b; w. u! b ;; First we ask the patches to draw themselves and set up a few variables+ y4 Z- L# \1 H- O
setup-patches
9 C& E b: h- ]7 g3 I) ?2 {( r/ g make-current one-of intersections: z5 _2 w! C$ J6 J- I" A$ g
label-current
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' _6 p1 A' ]# n' i set-default-shape turtles "car"
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9 I2 Z1 O. x6 z3 c; E: r G if (num-cars > count roads)( D! D% i- }* h8 i
[
, T- f' M. X9 J" T' t$ Y/ a user-message (word "There are too many cars for the amount of "
! G; X6 x. u! z$ s" X% c% m "road. Either increase the amount of roads "5 a" ^. p$ M) C7 g8 U$ G& a5 E% p
"by increasing the GRID-SIZE-X or "# `! j; s- y% x, R3 k& w; Q
"GRID-SIZE-Y sliders, or decrease the "
1 K; n. w$ ~9 u! L+ x1 B1 W "number of cars by lowering the NUMBER slider.\n"
) J: s: I: r! v* ]4 p "The setup has stopped.")
, o/ e$ n* q# i# K( P8 U+ u, l stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
( f# | t% k6 D3 Y crt num-cars8 h, l, E% f# h6 ]
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setup-cars
. m2 X9 Z" x0 S- B9 \; r% c set-car-color
3 P6 y, `6 S/ X: |" c) D record-data: R L* Y; e9 E' x3 h4 L1 E' n
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$ {1 ?( r/ ? I9 ^2 [1 k ;; give the turtles an initial speed/ a/ V& ^7 J% J' \% R* h
ask turtles [ set-car-speed ]( x. _" q7 H8 @" y5 w4 P
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reset-ticks
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;; Initialize the global variables to appropriate values
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set current-light nobody ;; just for now, since there are no lights yet6 e' T w; r* |
set phase 0
) p: _( s; W- F, m) C set num-cars-stopped 0
: x) i' l7 a8 \/ p1 [ set grid-x-inc world-width / grid-size-x
- q5 @& }9 E5 |! Z2 m set grid-y-inc world-height / grid-size-y
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
5 |5 `: x8 O4 R" u: P2 w: r. A set acceleration 0.099
$ l U. \7 ^+ l% S! Nend/ ?8 j- E) O ~: {
! L, G' i$ G) e& F;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
7 d7 {5 l4 {. ^/ ?5 ~5 O5 f. t1 `;; and initialize the traffic lights to one setting
9 ?( P3 A" A1 Hto setup-patches* W% m6 @: u1 w7 E h# O
;; initialize the patch-owned variables and color the patches to a base-color
) C9 j/ I+ N% i/ O' l ask patches9 ~4 C' _6 y3 a2 j
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set intersection? false- [# e; W+ n: p6 \. G
set auto? false
' y6 }) @" W4 j+ e6 _& E, e set green-light-up? true9 ~8 m4 T c. O- S8 L
set my-row -1! C6 M. O2 j* E; ], @: Q0 O# J8 _
set my-column -11 Y- |: e* B) i8 u- q5 F+ Q9 s; D
set my-phase -1
. S& |! v) m8 v set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets
5 r, b" Q# z/ L* l) a set roads patches with7 Z" \, }2 x& E( H6 A' H# v% d5 R
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or6 |; s4 q' N# |
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
% X% V" Y- ?+ e set intersections roads with
% m5 m- u/ K/ B3 H/ b6 \+ n [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
6 x5 N, n0 h7 m: F' m& B$ X {$ D (floor((pycor + max-pycor) mod grid-y-inc) = 0)]" n( e% p& s2 {7 P" T4 [' q- C
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ask roads [ set pcolor white ]
0 q- d2 V1 _0 ~! ]- P" Y0 D2 |- ? setup-intersections
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5 V. e6 C9 G+ a b" R其中定义道路的句子,如下所示,是什么意思啊?3 M& V# B! M9 d, m# |% D
set roads patches with) K, U# C m$ w0 I
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or% y. P6 i$ f( H6 d
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]* F3 z( Y$ [% ~: X/ E2 |, H. D
谁能帮我解释一下[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0)是什么意思吗? |
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