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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。
/ {5 g9 e' ~. y& L9 ^netlogo自带的social science--traffic grid这一例子当中,
' S# S; i+ M! b. J& x* Aglobals
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grid-x-inc ;; the amount of patches in between two roads in the x direction
+ S( D+ M) S; R+ {: `6 r* Y: [% o6 r grid-y-inc ;; the amount of patches in between two roads in the y direction
$ V; G# U" w7 J% X5 @ acceleration ;; the constant that controls how much a car speeds up or slows down by if
; h! s: }( u, h* E) I/ r ;; it is to accelerate or decelerate
* m2 H5 `! Y1 L0 I+ u phase ;; keeps track of the phase( |. @: U3 ?; @: K# D# @7 g( q3 D
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
: R* O0 N% B5 c current-light ;; the currently selected light
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2 N" [3 _ o ?7 Q! K ;; patch agentsets R. s' d& b$ u# c* R6 Z! h8 Q5 |
intersections ;; agentset containing the patches that are intersections
& s& k* `* ?# h1 ? roads ;; agentset containing the patches that are roads
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- w8 u- q. ~+ h: J* N( R2 E) K) qturtles-own
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speed ;; the speed of the turtle% A7 j9 X5 `: | d8 [/ {+ ]" `
up-car? ;; true if the turtle moves downwards and false if it moves to the right
6 b! p/ P- h. q X0 E wait-time ;; the amount of time since the last time a turtle has moved3 M4 Z. Y5 F" D% U/ h
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, ]' |* u$ b, {& I9 j0 o# Npatches-own
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intersection? ;; true if the patch is at the intersection of two roads$ M) l' ]3 I1 o7 v
green-light-up? ;; true if the green light is above the intersection. otherwise, false.5 @: `1 |5 b( j; V
;; false for a non-intersection patches.
* x, c# W2 z0 d! Q my-row ;; the row of the intersection counting from the upper left corner of the
$ Z2 D( b! `7 ~- V1 x ;; world. -1 for non-intersection patches.) u) K' u N. d* u! t
my-column ;; the column of the intersection counting from the upper left corner of the
0 o/ F/ O' U) p% D+ P7 Z1 | ;; world. -1 for non-intersection patches.9 ?& n2 w6 z+ N8 P7 h: b
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
. A4 r0 F6 b/ u* [) B auto? ;; whether or not this intersection will switch automatically.& S$ { D* l0 p# `3 L$ n0 M
;; false for non-intersection patches.+ b/ i) `+ S7 s0 W5 y Q$ R
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;;;;;;;;;;;;;;;;;;;;;;
0 l) l1 T1 S- E4 g( A;; Setup Procedures ;;
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* M. `1 j+ I/ y; {/ `5 P3 N6 _;; Initialize the display by giving the global and patch variables initial values.. Y/ |3 G- ^8 S: @# K6 j
;; Create num-cars of turtles if there are enough road patches for one turtle to n0 a8 `3 d1 T. a" K3 B
;; be created per road patch. Set up the plots.
/ U* b/ ~( l3 ito setup
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setup-globals) r% u* W3 ^- B9 ^) ~6 Y: _
7 B1 N7 g# s0 Q' C ;; First we ask the patches to draw themselves and set up a few variables
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make-current one-of intersections
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# u& K) x% B, q+ K& ~ set-default-shape turtles "car"5 [2 c# _- ?- p( g. k$ g3 p
% S$ p4 N0 Y5 ^8 {; U H if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "9 N/ z3 r, s- K4 _! S. ]
"road. Either increase the amount of roads "
( H' [8 ]1 G/ v' h/ K. P+ h "by increasing the GRID-SIZE-X or "
* i2 b9 z, B6 p2 A- A6 | "GRID-SIZE-Y sliders, or decrease the "
* S7 V0 E3 o3 b "number of cars by lowering the NUMBER slider.\n"
: Z' S- X) P k& w "The setup has stopped.")
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
9 ?+ T* M8 A2 M/ Q& `! ? crt num-cars! f+ V, x/ H N9 ?' K3 V' _% R
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setup-cars) b$ H* A+ L: ]( a0 k
set-car-color- P0 A0 Y5 f( J. @: Q0 v
record-data
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$ G ^" U+ E9 L3 C3 J ;; give the turtles an initial speed
# k6 S/ b1 }* ^8 _! W* B ask turtles [ set-car-speed ]
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6 y+ y/ M% E+ H3 ~% }8 O) D6 x, ] reset-ticks& E" a4 Q1 Q7 _; a4 |1 i
end
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;; Initialize the global variables to appropriate values# I; H# ^' m/ f3 ~3 c0 l. M) t T
to setup-globals
, y/ Z5 w/ @! [* K4 } set current-light nobody ;; just for now, since there are no lights yet
- Q; j+ [! U4 Q% o: Y* g8 f set phase 0" {; d4 l* t( U- z
set num-cars-stopped 05 L: O( l. Q% l3 U A9 }
set grid-x-inc world-width / grid-size-x/ h4 u. ?/ N% d; I4 `* q
set grid-y-inc world-height / grid-size-y. O. d6 o& e: C& G
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
( z8 R! |% ]' S" ?" k$ ? u set acceleration 0.099
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
- L3 Z# e# M5 [4 k1 p;; and initialize the traffic lights to one setting# k5 S' e8 w% X; L+ H1 B. O2 Q
to setup-patches! `$ i* g* c! R) ]3 M
;; initialize the patch-owned variables and color the patches to a base-color
# W( n3 i- `- W4 Q% J+ Q# L& ]1 C( a8 N ask patches
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set intersection? false" e' v$ c% h8 i2 b
set auto? false% N1 M" s2 o9 x0 f" e
set green-light-up? true1 k2 t( }1 \7 l. G
set my-row -1% x8 B; T" x( Z' J- B
set my-column -1
6 m! h4 l3 V5 a% ^* Q7 p9 X set my-phase -1
, c, z N# H9 {+ W# J! E set pcolor brown + 30 z* T) @! S: |' M a: C4 z7 r# y/ s
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;; initialize the global variables that hold patch agentsets0 m( i- F$ B3 ^, g1 @% b/ u) p
set roads patches with
# J0 h; j# A, O: e. p& @5 Q [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
- _6 q5 ?3 ~5 _3 ~+ n (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
' F0 o, J: p9 U& K H( R' B, s set intersections roads with" k6 M1 d) w- r$ i$ Y1 [
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and D. u& Q" J; e, X% _4 D
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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) W8 ~/ { \/ h, F6 h ask roads [ set pcolor white ]+ R' Q/ }* {7 h7 F1 J% O9 ?" o3 L
setup-intersections( O; P% E' L! z/ p! L( ~7 r
end
. m. q8 {5 I/ F1 P9 y& y2 E其中定义道路的句子,如下所示,是什么意思啊?" t& ~, \3 J1 X* M! J( |" F
set roads patches with8 v* K; p Q5 U- Q; e# g: f
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or+ A7 w/ E) ~& |1 Z1 E9 D
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]4 D: m! c/ @: G% D: ~/ R
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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