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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。
$ u+ R- E3 z5 k6 j, n+ e2 fnetlogo自带的social science--traffic grid这一例子当中,
# m0 F' U6 r1 ]) Y3 x& F5 n8 vglobals
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, P( Z9 w V( F4 K2 c5 s k grid-x-inc ;; the amount of patches in between two roads in the x direction. m! n' a. A1 o6 \+ g
grid-y-inc ;; the amount of patches in between two roads in the y direction% i K$ c6 R+ M# S, u
acceleration ;; the constant that controls how much a car speeds up or slows down by if
) ^; J; y# l( m ;; it is to accelerate or decelerate9 J# H, D: g8 L) s
phase ;; keeps track of the phase4 u1 P1 v( ]3 W' A+ K
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
0 F5 X$ W5 Q8 {: ] @. ~5 ~ current-light ;; the currently selected light- ~4 i5 d# c/ r" e; o1 X
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;; patch agentsets/ R/ z+ y5 y; ]8 a
intersections ;; agentset containing the patches that are intersections
) l" M% J" D6 g/ x3 D roads ;; agentset containing the patches that are roads
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turtles-own
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# x; U& K7 q# A speed ;; the speed of the turtle5 a$ f0 j6 N/ C2 B
up-car? ;; true if the turtle moves downwards and false if it moves to the right
5 Z( |5 T! S! F2 y. D2 f+ l wait-time ;; the amount of time since the last time a turtle has moved
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patches-own
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( r7 B4 q& e [ intersection? ;; true if the patch is at the intersection of two roads
, Z8 p$ W9 i3 c, `9 _ green-light-up? ;; true if the green light is above the intersection. otherwise, false.
- k4 Y3 ~' d h, j1 `+ I5 R+ R ;; false for a non-intersection patches.2 S: l4 k- U. |) Z' S) c/ Y
my-row ;; the row of the intersection counting from the upper left corner of the
2 Z4 c2 j# N) O' q; ^" \ ;; world. -1 for non-intersection patches.; y/ D! s& L4 F, {
my-column ;; the column of the intersection counting from the upper left corner of the
6 H7 R I+ C' n j# ] ;; world. -1 for non-intersection patches.' U0 G9 c) O- J$ V9 I% @
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
4 b) L1 N0 G" F9 X: a! s" Q& x auto? ;; whether or not this intersection will switch automatically.4 M& }4 O, p5 @1 ]
;; false for non-intersection patches.! z& D) z. Y# A# A# Y6 B5 ^6 S+ n, H' Q
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3 D0 z8 \) z: ]2 V7 u3 X;;;;;;;;;;;;;;;;;;;;;;4 ^: ~) ~: F% ~3 _" O
;; Setup Procedures ;;
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;; Initialize the display by giving the global and patch variables initial values.
; w% }) m3 w' Q. s* @# M;; Create num-cars of turtles if there are enough road patches for one turtle to: F, e6 D9 U: i T) i k
;; be created per road patch. Set up the plots.7 P9 x5 [1 |4 o5 g8 A0 R' [, g
to setup* ^- Q7 v1 ]" o7 A5 q! F- P
ca
/ o8 M3 w* s2 |, j H$ K, c7 j7 r setup-globals
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;; First we ask the patches to draw themselves and set up a few variables, ?( T$ G/ S' b/ I3 E
setup-patches
& l4 p$ B( g) J/ k" J make-current one-of intersections
$ l! r7 X/ n2 ?+ S label-current5 a) _% ^8 ^+ {" Q7 d* |! B/ a; a/ [
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set-default-shape turtles "car"
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if (num-cars > count roads)) j. o) z" q# p3 @: A( ~4 \
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user-message (word "There are too many cars for the amount of "/ N* O- K f2 d1 ^% ~' v
"road. Either increase the amount of roads "0 l* h7 |" } R6 b/ r9 ^4 v
"by increasing the GRID-SIZE-X or "" S( Z8 g: ]) k0 A+ q
"GRID-SIZE-Y sliders, or decrease the "
1 J; G, v( n. S, O* w) S "number of cars by lowering the NUMBER slider.\n"
$ j' h! v7 I9 A/ e! G "The setup has stopped.")2 X4 q3 A U# n% D7 g
stop
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/ q" a1 @9 M! [; z; ?. K ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
4 c: n9 S6 {1 V, V crt num-cars
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setup-cars
6 `& u7 R+ J* h' ?9 {) @ set-car-color+ H/ E6 R3 E. D3 Y, X; n- L
record-data
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;; give the turtles an initial speed8 V6 x" q2 D( C) U' [$ K
ask turtles [ set-car-speed ]
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& s: a0 m7 |, r+ M" @! f5 P$ n* i reset-ticks s/ s. @5 C4 l. F( G7 [( ?
end
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0 b, C0 j% L# e& q8 P;; Initialize the global variables to appropriate values
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set current-light nobody ;; just for now, since there are no lights yet0 j: S9 K! R( g% C0 |4 N0 s! I
set phase 0! b5 w9 N2 d( w0 ]- D" o2 F) n
set num-cars-stopped 0
) O" U, O( ^$ H3 u) }' n set grid-x-inc world-width / grid-size-x
( a* b) S6 M- y0 K3 X6 c 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
) A+ H2 @9 ?- ^# \ set acceleration 0.099* Y+ E% A8 ^3 Z4 \
end5 j/ f2 O9 r: q$ U$ y
/ F, e$ i, h1 V/ V3 y& s;; Make the patches have appropriate colors, set up the roads and intersections agentsets,% `% @4 S- N T) J' P" H
;; and initialize the traffic lights to one setting9 U+ g2 d V' _/ k( Y8 U
to setup-patches. f1 K! Q- D! V% M. B- C0 [8 X3 L
;; initialize the patch-owned variables and color the patches to a base-color
: ]( F& t9 J7 N' N! g9 p5 X, J ask patches9 g/ J3 C' Q X+ I% X* G$ R
[
+ T1 \2 o( R0 V' H! h! _) I) e. K; _0 R set intersection? false( u; @1 K1 n5 c% R9 T
set auto? false
, ^' k. M( Z) i set green-light-up? true/ Q2 v& D6 ^* c! T# @5 z1 ?! R
set my-row -1 e8 f' m& k3 h" S' V1 _9 ]/ y
set my-column -1' }5 j1 r' R: W0 Z5 @- h/ p5 [
set my-phase -1+ J' r& m _) S+ F0 i' r1 @
set pcolor brown + 3
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5 _. U# F$ T0 T* U% { ;; initialize the global variables that hold patch agentsets0 B2 S7 S' ~( N" A; g
set roads patches with
( d3 ~- A6 C% ?6 m9 d. T [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
# H) _" ~, f9 K7 W (floor((pycor + max-pycor) mod grid-y-inc) = 0)]3 y$ x) j. h3 m" K
set intersections roads with& p3 \( n: `2 }: s5 b5 K
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
- N' y4 T- r7 N8 l# a& p (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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, C; K: }" ]% G% x. J ask roads [ set pcolor white ]+ X3 u" K& a) y V. m1 T5 k
setup-intersections! O. B7 y6 |1 z+ ]9 D- \
end
9 C8 p1 P1 D9 w; O) c; |其中定义道路的句子,如下所示,是什么意思啊?2 ~8 y4 h: t4 f/ M& Y$ W5 p9 {
set roads patches with
$ T; p( I7 X! D8 c1 O [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
3 v3 z1 ~* N6 Q3 B+ M9 t, y (floor((pycor + max-pycor) mod grid-y-inc) = 0)]$ @# {3 f$ n/ N; @5 K2 |& C
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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