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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。
, k' i' P. s0 {# J/ _netlogo自带的social science--traffic grid这一例子当中,8 K" X" K2 c3 R; h
globals* A% ^+ ?! w" @- p5 [/ ~- w7 `* M
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% B5 e3 C, ^" I2 l) `) r2 ` grid-x-inc ;; the amount of patches in between two roads in the x direction
' v9 @0 v) t, M& R! ?6 h# g( v grid-y-inc ;; the amount of patches in between two roads in the y direction4 W/ O+ D U$ A& v
acceleration ;; the constant that controls how much a car speeds up or slows down by if
; y) P1 I3 \; C! s' M ;; it is to accelerate or decelerate9 D- U) A* L* o! i6 i# E
phase ;; keeps track of the phase0 a: T7 U. c x( x( K0 k
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
( e6 q' ~2 `& ^( v! y current-light ;; the currently selected light
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& `! g& |6 i( B- | f0 E ;; patch agentsets
2 c. T( W# T) P' l' K intersections ;; agentset containing the patches that are intersections
% i' l! ~: p3 I9 R7 P) G- d6 h roads ;; agentset containing the patches that are roads3 n* \" I6 }: w/ i7 V
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* j5 m$ R% Z" n( L9 o8 u% \turtles-own! d; V& c. r; s; Q. U- o9 m
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speed ;; the speed of the turtle9 K) F0 u' n, X! ?. S$ A/ W
up-car? ;; true if the turtle moves downwards and false if it moves to the right
( i0 t; Y+ J( L0 J wait-time ;; the amount of time since the last time a turtle has moved
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patches-own; h7 l% f! C8 ?
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& B- q9 T3 i. y) U3 @, Y intersection? ;; true if the patch is at the intersection of two roads% N7 ?8 T# ^) @6 S
green-light-up? ;; true if the green light is above the intersection. otherwise, false.3 d. K6 r& g% Q
;; false for a non-intersection patches.. F1 V: h) E5 Y, Q9 x
my-row ;; the row of the intersection counting from the upper left corner of the) u! x3 }. t" Q( M1 M [# W
;; world. -1 for non-intersection patches.
( R: R1 `- c+ z0 \4 P, Y my-column ;; the column of the intersection counting from the upper left corner of the9 P' j k4 o1 A7 S% @6 z- {( M3 n
;; world. -1 for non-intersection patches.
+ @- T8 X' ]- Y4 f9 g my-phase ;; the phase for the intersection. -1 for non-intersection patches.# q0 B: W9 o* J' A/ g2 D
auto? ;; whether or not this intersection will switch automatically.
2 @4 [& \. ? w+ F/ K( _ ~ ;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;
1 G4 [+ }8 f% E) X;; Setup Procedures ;;( m5 T l: y* f3 L. H+ |; T
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;; Initialize the display by giving the global and patch variables initial values.# ~7 z: b, [, H- l( X: z6 y' j0 h
;; Create num-cars of turtles if there are enough road patches for one turtle to: k l* D( ?: f6 n0 n n
;; be created per road patch. Set up the plots.
* B _7 H) Y- F+ O4 {2 n) Hto setup6 s) x( \- N* N3 J' l( l l
ca
2 R1 E0 E) j: j setup-globals
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;; First we ask the patches to draw themselves and set up a few variables
& p+ n( R& ?: P5 v) L& f setup-patches
4 E) j* J- x. M# j, X make-current one-of intersections
8 G$ [3 N' ?; g0 M. G label-current: K' [# e' O7 C" v% }2 |' h
6 H1 N9 @: J- X! O5 p; t set-default-shape turtles "car"8 a; }& L1 N3 b- S/ \3 T
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if (num-cars > count roads)+ b1 x* [% `5 ^" C$ c0 k. A) E/ n
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. z+ l* X. d0 h9 z: X! h user-message (word "There are too many cars for the amount of "5 S9 g& ?* R% U$ P7 B u
"road. Either increase the amount of roads "
' @0 X/ B1 k. C( w8 e "by increasing the GRID-SIZE-X or "9 J. D; k9 Y" }7 \1 }7 _
"GRID-SIZE-Y sliders, or decrease the "
- Y8 }+ H, F. h5 H7 K7 M) g "number of cars by lowering the NUMBER slider.\n"
( i; b* c: w5 Z( d+ j3 G6 ? "The setup has stopped.")2 n* p ]# ~' o6 E; I: [( o# I
stop
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M# ^( x" p6 o( p# K ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color5 q' J5 y9 v+ L7 W( {
crt num-cars0 u% p+ v; A, I' v4 S6 l6 A
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+ m0 `9 l0 _( U: {# | setup-cars7 L8 U6 M6 ?& [. k& d
set-car-color/ A7 s* p) f$ J' H
record-data+ p7 ?: A2 B& p8 k3 e; ~& D
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, k% E# G- M5 P ;; give the turtles an initial speed; T; B0 m2 T) C% h1 O
ask turtles [ set-car-speed ]0 ^" J, _/ v: O, O8 T: |# D* I
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reset-ticks/ P7 {& @8 r. m+ F1 g
end7 z; q' `6 H2 `
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;; Initialize the global variables to appropriate values* U. f G2 E; l2 |) m$ c _
to setup-globals" e. i8 x" t* G1 j# i
set current-light nobody ;; just for now, since there are no lights yet8 y9 V( a) d6 G# t6 U. d! o
set phase 0. s- y; \$ l1 f. m7 B `2 ^% N
set num-cars-stopped 0; Z$ k; V. i! h5 y% r8 w, \ i3 _
set grid-x-inc world-width / grid-size-x
) s9 Q, w! t( \+ X& }& w4 F1 R set grid-y-inc world-height / grid-size-y
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! S" [+ o9 }- {+ O) E, J ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary3 O9 A {4 E; m, g7 I! W
set acceleration 0.099
7 S7 y- E: I( @- Fend
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4 X- T3 i! m" B+ M) s* z$ b% v7 {;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
6 N# L5 H$ ] t1 @4 A4 H;; and initialize the traffic lights to one setting
+ S0 B0 E/ V) u% U. hto setup-patches1 |% v1 F+ _6 j6 B: u
;; initialize the patch-owned variables and color the patches to a base-color7 C, C$ b* t1 ~+ r# a0 y2 D, G6 w
ask patches
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* ]! Z' ]( L- J1 P, |: k set intersection? false
0 v6 z5 Y2 J5 q1 r set auto? false6 T6 a1 z* F7 w* D- W4 b
set green-light-up? true& t9 ~! L: C% {1 V9 Q, p7 g' w- Z
set my-row -16 G/ ?# T$ a! Z: w
set my-column -1; n1 |4 o, w- N$ y
set my-phase -1
1 K, S' p4 r8 }1 E set pcolor brown + 37 y/ N+ U5 B- x) ]: Y& j$ [
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1 |8 |9 E! F/ f4 i ;; initialize the global variables that hold patch agentsets% W' V+ ]. u8 h' Y; ~4 E3 D7 w' W
set roads patches with7 @! z( }5 |" ]( ^
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or/ w9 ^6 b( N# i: |+ C
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]$ B7 _+ @* H1 D! J) z
set intersections roads with
) ~9 E5 A. Z2 @+ V- t9 ? [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and; \8 @+ g j% c& ]# q l/ D8 @( k
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]* E& k3 b5 K, I4 g0 D; F7 L
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ask roads [ set pcolor white ]( ~0 A3 S8 ?1 w" N% ^0 ]3 N
setup-intersections
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' `' c3 I0 N `; z( Z8 q6 T6 z7 _7 C其中定义道路的句子,如下所示,是什么意思啊?
* O4 N. Z- y. p+ R7 ` set roads patches with
5 L* U" C- z1 D j) _0 W/ n ? [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
: M9 @6 e; d3 G0 q( J- [: j (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
9 w/ ~, q3 y8 B: F! t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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