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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。
6 A% h, b/ [/ Inetlogo自带的social science--traffic grid这一例子当中,
8 f% h2 ] J0 Nglobals
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grid-x-inc ;; the amount of patches in between two roads in the x direction( S: D, }* C4 z2 i& H- B
grid-y-inc ;; the amount of patches in between two roads in the y direction
1 j5 C1 D# r4 L! m8 O$ f9 ~) h acceleration ;; the constant that controls how much a car speeds up or slows down by if
0 a* k. O* F F; m ;; it is to accelerate or decelerate& L3 }5 N& T$ G# \$ C7 m& V
phase ;; keeps track of the phase3 [- E+ c. i1 c) _
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
: C6 F3 S9 P Y5 Q, q X- M current-light ;; the currently selected light7 k+ R# j- k" o+ k. I! C
% c: w. P# k4 c ;; patch agentsets. j& H" Z& a, y" {2 V7 q& T
intersections ;; agentset containing the patches that are intersections
1 y6 Y: C& [) ^8 l: {! A roads ;; agentset containing the patches that are roads
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turtles-own
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speed ;; the speed of the turtle1 v" A1 c9 L( m
up-car? ;; true if the turtle moves downwards and false if it moves to the right* t9 \" e& z# S& K5 M
wait-time ;; the amount of time since the last time a turtle has moved
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patches-own
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9 z% D4 {. Z x6 N$ X/ d6 h* ~ intersection? ;; true if the patch is at the intersection of two roads
& F" {/ d- ~/ Y/ x5 E/ I green-light-up? ;; true if the green light is above the intersection. otherwise, false.
, d0 c8 s1 q1 g; f ;; false for a non-intersection patches.
; D$ J& a+ j- v* f. {3 u my-row ;; the row of the intersection counting from the upper left corner of the
( _" T4 Y0 t( L' ]. x* F7 [ ;; world. -1 for non-intersection patches.& j! T$ o: n {' Z% Y9 w8 H! v
my-column ;; the column of the intersection counting from the upper left corner of the6 R9 d9 B& T \! R$ H
;; world. -1 for non-intersection patches.
: W2 E! R$ z% t. A2 Q my-phase ;; the phase for the intersection. -1 for non-intersection patches.
. S W) B7 Q9 C" ~ auto? ;; whether or not this intersection will switch automatically.
( @4 j8 M6 Y8 t ;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;
& A; ~# B7 i' G1 T;; Setup Procedures ;;
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;; Initialize the display by giving the global and patch variables initial values.
Q N _# ^# v' H. s8 G;; Create num-cars of turtles if there are enough road patches for one turtle to
: o+ ^1 @( s& l% U;; be created per road patch. Set up the plots.
6 t! L$ J# t# O; p3 w1 ?to setup
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setup-globals5 w) L5 c$ F/ R. \8 X) j7 f
. V0 q" X, j6 ?* K ;; First we ask the patches to draw themselves and set up a few variables
6 i6 h0 ?: [) u% B2 h( L: C7 d setup-patches
% e) j6 x: s$ z- n make-current one-of intersections
' m, `1 ^0 y$ ~2 { label-current5 V; u, N9 j3 z+ d- _: w
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set-default-shape turtles "car"
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if (num-cars > count roads)) D4 K- `& x) Q
[
; N# ?& p5 m$ z: R! n0 V user-message (word "There are too many cars for the amount of "3 {8 A* {6 Q7 r2 l, s
"road. Either increase the amount of roads "
) q* N# F* P& u E "by increasing the GRID-SIZE-X or "
% |+ ~' K$ k* w: P! g6 ?" N1 _ "GRID-SIZE-Y sliders, or decrease the "( d3 q0 x7 p! h5 ]# e. M% P6 X
"number of cars by lowering the NUMBER slider.\n"
6 e9 |# H- K4 @0 l! F* A "The setup has stopped.")# ?, P# u- _; E; T2 R# o: c
stop
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0 s. s2 n1 L: \# A ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
( _! E Q& L3 y crt num-cars
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setup-cars
% ~7 h+ s/ Q* `8 }" T set-car-color2 X; K9 v, x% z" e8 j
record-data! |* q+ L% G. P% q
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;; give the turtles an initial speed
& w( @9 _8 R/ Q8 {$ w9 m+ x ask turtles [ set-car-speed ]0 ?. z0 I+ X' X# r) R. S
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reset-ticks- V6 |! H0 M* {/ I' `
end/ ]5 A. g8 B$ x4 q- i/ R
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;; Initialize the global variables to appropriate values
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( Z5 r6 S" z; K. S set current-light nobody ;; just for now, since there are no lights yet* N3 U ~7 t: r, p; ]- k
set phase 0
; y4 Y: \3 O2 {0 `& B set num-cars-stopped 0
* H" h; K. H' S! i3 { set grid-x-inc world-width / grid-size-x0 a2 z: R ?$ [ Y" X% x
set grid-y-inc world-height / grid-size-y
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K: h, N& f$ B9 d ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
- \* I- l) W* i set acceleration 0.099( K! I! g( j; Q& B
end
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,( R6 L9 j5 u% C0 y- h0 p
;; and initialize the traffic lights to one setting% Q6 z- A( {, K" T. _: N+ v
to setup-patches
7 F6 y% c5 e) x/ p ;; initialize the patch-owned variables and color the patches to a base-color s) z0 f! K- O- l. D4 H- t! q6 l
ask patches
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set intersection? false
3 c0 m1 y3 `+ U {9 R' K set auto? false. C$ ]; G2 E# B$ ?5 P" p
set green-light-up? true: g# ?. l5 Z- U# c O; W
set my-row -1/ O' P$ b, |0 z i9 E
set my-column -1, g2 R4 G2 T U: g, i8 u5 U9 F
set my-phase -1
6 t3 Y" E) K2 F9 L9 T0 b set pcolor brown + 3) C6 S/ ?6 ?' n3 O _+ R6 U
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;; initialize the global variables that hold patch agentsets1 ?) r0 ?4 B: W- H4 {' C# D& Y
set roads patches with
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(floor((pycor + max-pycor) mod grid-y-inc) = 0)]! k% z% l6 L& y, l, M6 S, p
set intersections roads with
9 s `9 i. ?- s% n5 \4 f. T [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
+ x7 U' G1 F" F5 ` (floor((pycor + max-pycor) mod grid-y-inc) = 0)]2 N8 {0 e0 y9 Y" I
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ask roads [ set pcolor white ]
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; X2 i0 H1 {* _$ V) C其中定义道路的句子,如下所示,是什么意思啊?$ D, {( t) Z+ a. i
set roads patches with" s1 m& e3 g) L7 {# U b
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or) Z0 i. b+ g. r1 [ e" L* A
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]2 V8 ]% S' o e; O7 T# @$ T$ 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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