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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。
* v% a: I. d b% m0 ~netlogo自带的social science--traffic grid这一例子当中,6 G7 u! V6 I/ D7 V" I
globals
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grid-x-inc ;; the amount of patches in between two roads in the x direction) _: u# T% E7 y1 u
grid-y-inc ;; the amount of patches in between two roads in the y direction
1 m# }# ^0 O( a# T' y8 r6 Q acceleration ;; the constant that controls how much a car speeds up or slows down by if$ ]; K3 V* i% R! n: n) P6 w
;; it is to accelerate or decelerate5 g) t( p( x7 x6 H m. F
phase ;; keeps track of the phase6 U% f$ Q: x& `4 L0 H- _
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure( Q4 _2 f2 r( \) A% M8 c* \
current-light ;; the currently selected light, E. C6 b% N. ~# y& j* U" Y
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;; patch agentsets& P2 X! h' R# e% s8 ?$ [
intersections ;; agentset containing the patches that are intersections- p" n( W* ]8 m5 {
roads ;; agentset containing the patches that are roads; r. ^" ]" l# @1 y0 N0 x
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turtles-own) a q& A9 G% V( j+ s
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X# k- @1 N2 p w* s+ P6 A speed ;; the speed of the turtle
7 U1 Z4 ?* j5 X, Y# s% ^4 A. X up-car? ;; true if the turtle moves downwards and false if it moves to the right
1 b4 ]6 B# J7 ~" {4 V wait-time ;; the amount of time since the last time a turtle has moved4 m! f* g* N( F/ p7 d# C* H
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* K& V0 Y( Q8 K8 e0 t# lpatches-own
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0 f3 z' S& a/ [$ j6 V intersection? ;; true if the patch is at the intersection of two roads" M% c7 d. Z) P5 ^6 Y
green-light-up? ;; true if the green light is above the intersection. otherwise, false., n' Y. X' I6 u3 M; p/ C
;; false for a non-intersection patches.; B) Y; }5 D2 M5 A6 p
my-row ;; the row of the intersection counting from the upper left corner of the
+ q" j, [! F, y" w ;; world. -1 for non-intersection patches.
! q8 V3 Y) d& ?9 `. f' A4 Z) P my-column ;; the column of the intersection counting from the upper left corner of the; T9 d7 ?1 M' w7 s1 h
;; world. -1 for non-intersection patches.) O% H) |, m1 x2 A4 Q' K+ }2 J) d
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
" {$ {3 F# z3 \9 F0 _ `; B+ H4 G auto? ;; whether or not this intersection will switch automatically.
$ D$ I4 M& p; |& e% g& R8 [ F ;; false for non-intersection patches.
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# J6 }' s! F$ _* Y9 y4 C5 ^;;;;;;;;;;;;;;;;;;;;;;
( f( h$ j8 E5 G& q* _# {: N" l;; Setup Procedures ;;& b) w: V8 D- E) p
;;;;;;;;;;;;;;;;;;;;;;
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7 ]) C( z0 E+ Q$ s;; Initialize the display by giving the global and patch variables initial values./ A9 v$ n3 F: _/ o' B+ j _
;; Create num-cars of turtles if there are enough road patches for one turtle to
5 U# m% H! O. j# c;; be created per road patch. Set up the plots.4 }% o" C5 s7 I/ v/ F' o
to setup% H9 O" I9 T5 ?% @; \% o
ca
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;; First we ask the patches to draw themselves and set up a few variables
0 N" |5 d$ H5 ]8 i% ^* f setup-patches
5 o+ R5 b+ W2 k6 V5 g' \ make-current one-of intersections' ]5 a( E# s/ n" T
label-current
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' ~, p) I3 f7 q, L, Z7 L set-default-shape turtles "car", p5 S: k5 _: _3 \% L5 R/ s
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if (num-cars > count roads)$ C3 M1 C% a+ t2 Z. G5 C) V9 L
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user-message (word "There are too many cars for the amount of "
" p& h* T, l: a8 v( V, I. A "road. Either increase the amount of roads "
& E7 _, p2 B9 i ? "by increasing the GRID-SIZE-X or "
0 P6 t' }" z+ j! k. U5 m' \! E4 U "GRID-SIZE-Y sliders, or decrease the "
2 U" i+ z& ~8 x "number of cars by lowering the NUMBER slider.\n"
) H: S2 T7 X& |; W/ X "The setup has stopped.")
/ l# ^9 O" o3 q7 Y! R5 k! x stop0 v1 |" @: k% s: R
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color2 d7 u/ k* o1 D! N: y9 s9 E# i
crt num-cars
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" X, N/ f5 e& |9 A, c setup-cars. _1 f* ?5 H* i F4 _- e
set-car-color
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. k: X2 S! T; l ;; give the turtles an initial speed) r) D+ b' d; B1 a; r: s
ask turtles [ set-car-speed ]
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reset-ticks$ R" Q" }, k( C0 t
end
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;; Initialize the global variables to appropriate values) X0 Y8 g2 D1 e+ Y, i0 t: W1 B' z( g" m/ W
to setup-globals* @2 s1 z8 P. Q1 G: G
set current-light nobody ;; just for now, since there are no lights yet
" z0 A. J H* e) s; ~ set phase 0
# s$ u4 N& U9 V) K7 d3 r) ? z7 |/ u set num-cars-stopped 0$ C C" o1 h& N; L2 @ O9 y
set grid-x-inc world-width / grid-size-x* O g& D# ]4 o) G0 i2 x3 E
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 boundary0 S$ t& c* J+ K! q
set acceleration 0.099
; m% U' u4 F+ X6 J0 ?, ]3 u$ _end
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
: F+ F; v6 G! U; d0 @;; and initialize the traffic lights to one setting
+ X( Q. o3 a1 J/ U( f9 mto setup-patches: m. X1 k* A+ ?% y
;; initialize the patch-owned variables and color the patches to a base-color6 P+ A; ^! y* s, C7 ?
ask patches! B& c7 j" ~4 g5 f' Y
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set intersection? false# S9 f# W/ w4 n# E- t
set auto? false
/ w- w. ^3 S2 J4 g, P- z; y: `* | set green-light-up? true
: K$ }5 I5 E+ [' z& m set my-row -1
0 g. L+ N. V( A& E. U- a set my-column -1
( y; A9 N$ { ?: _0 a set my-phase -1, s; H# s# V, j6 n( V; c, o
set pcolor brown + 3' d l% l! \) t7 s4 O% M
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;; initialize the global variables that hold patch agentsets$ Y0 r$ W2 T( `. K! B6 s+ W
set roads patches with
P8 d& d' u2 n3 s n: ?+ W [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or3 V, D3 S' X! H8 z& `9 X# k
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
4 C& z7 J/ I; S2 t; k6 ~5 h- Y, H5 z set intersections roads with% y) \8 B" k" E5 Q1 J) ~4 [
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
5 S: _8 ]$ L3 R: b (floor((pycor + max-pycor) mod grid-y-inc) = 0)]7 K" z% W- g9 R- e
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ask roads [ set pcolor white ]
5 f* y& N/ ~6 y: y, g6 H7 S setup-intersections
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& @: q3 ?, j# }0 ?其中定义道路的句子,如下所示,是什么意思啊? F1 B3 j9 _" ~/ }. f6 _
set roads patches with
4 K- B. H( ^: @4 ~$ G [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
8 \9 T4 L0 F- [8 o (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
$ Q2 F* ~* v+ N0 K- S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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