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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。
9 ?) G2 k! q) \0 p3 xnetlogo自带的social science--traffic grid这一例子当中,
! i" J6 R- I! Eglobals. J9 z& z( p3 z: b& Q( d. u' @. l
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grid-x-inc ;; the amount of patches in between two roads in the x direction
9 g0 @) u* O- s/ T/ z4 s grid-y-inc ;; the amount of patches in between two roads in the y direction
% }7 r0 ?+ c9 l" j/ z; N8 f acceleration ;; the constant that controls how much a car speeds up or slows down by if
( O4 M: S3 B/ \' Q ;; it is to accelerate or decelerate4 Z' {) T. I4 n
phase ;; keeps track of the phase
5 r+ [# R9 U1 r2 p& U9 S- X4 x: U num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
1 _$ U$ F" T* F" o5 a; n current-light ;; the currently selected light+ F, \7 s/ Z9 Y1 ~# d6 N$ z
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;; patch agentsets
. Z% W8 B2 x0 X3 s- i intersections ;; agentset containing the patches that are intersections, f/ Y6 e2 j9 k
roads ;; agentset containing the patches that are roads8 B: M) l/ ^) F z! w0 U, \- ?
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turtles-own% Y. Y( A7 j, l. @8 {
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5 [+ ~! S8 n7 ` Q& R F speed ;; the speed of the turtle
7 {# d" l4 j- p up-car? ;; true if the turtle moves downwards and false if it moves to the right1 i0 h( G; j4 v" A1 F; q( w* k& p
wait-time ;; the amount of time since the last time a turtle has moved& e1 u$ k. ^8 J Y
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patches-own
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intersection? ;; true if the patch is at the intersection of two roads+ J* k J+ v( S) Y0 Z4 W$ I( D
green-light-up? ;; true if the green light is above the intersection. otherwise, false.' P; I1 W7 t: c6 [
;; false for a non-intersection patches.6 z8 E3 i( k: p5 B2 h, P4 c
my-row ;; the row of the intersection counting from the upper left corner of the2 K6 m7 {7 P7 q. i# A) ?; w' D
;; world. -1 for non-intersection patches.8 S# `' k. y7 o+ q- N7 I+ }% y
my-column ;; the column of the intersection counting from the upper left corner of the
~. i& q) ^! H4 y ;; world. -1 for non-intersection patches.$ Z! a5 {0 s; O: b* |- P( f x
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
3 `0 U. O7 _) X G7 V F5 P1 E auto? ;; whether or not this intersection will switch automatically.$ N% a% R2 I# g& L" F7 ~
;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;
% Q" M7 s" A" ~, \! Q% e;; Setup Procedures ;;' R5 M- V( o" s* g; W# Y! g7 r" f
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;; Initialize the display by giving the global and patch variables initial values.
0 D. Z9 a# C3 b/ V- W1 X3 v;; Create num-cars of turtles if there are enough road patches for one turtle to
3 [( W) \0 V( {4 p9 F' a;; be created per road patch. Set up the plots.
% ]3 K+ c9 U( J$ Tto setup+ ?& A4 A* E) |8 b- ^
ca
$ y) O. q' V8 f& ] setup-globals8 p% N# e- c2 j$ P) y
4 ^: w$ {: V6 s' b& t0 D ;; First we ask the patches to draw themselves and set up a few variables
% t" C+ {( I0 i/ J$ G setup-patches
( A2 H5 s4 W" c$ t1 s& C' k/ Q make-current one-of intersections% c/ |& \& t$ c+ A6 L7 A
label-current
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set-default-shape turtles "car"
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if (num-cars > count roads)1 A2 x( R% \- W' |% l+ A
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user-message (word "There are too many cars for the amount of "6 C- K( `; f2 I5 Z; S/ D+ i3 t9 U
"road. Either increase the amount of roads "
3 S9 T9 a( a( j& K4 h* } "by increasing the GRID-SIZE-X or "! t9 g7 {, C; p* [: H2 e+ O$ n# M
"GRID-SIZE-Y sliders, or decrease the "- K! V: g( k% g
"number of cars by lowering the NUMBER slider.\n"1 _1 c. C3 y0 _- A8 a) ~6 {1 h
"The setup has stopped.")7 j* c( E, F# s+ n
stop
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! e# S/ ~" ?4 o; W H7 M6 N ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color3 y. q2 } b6 u5 V' g: o
crt num-cars* l) [. r, l7 g1 j( b/ ~
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setup-cars
' w& n$ [! M: P3 Y! O6 i set-car-color
$ e& g5 Z7 F" T' ~0 P! H9 u; L* ^6 W record-data4 f( ^2 k# e7 b5 b( ~0 Q4 c$ J1 P
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1 Y8 H9 _: |) Q; ^3 r) q ;; give the turtles an initial speed
5 v4 N: o3 D( X% L) N ask turtles [ set-car-speed ]0 e+ t: s! k" B# X O. B
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reset-ticks
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, d, C& ?6 I4 `& {1 Z/ ?' ?;; Initialize the global variables to appropriate values S6 N( K" G5 ~; q; ~6 X/ x
to setup-globals
8 `# T1 ^, U& b; N9 F6 ` set current-light nobody ;; just for now, since there are no lights yet9 t0 ?/ c: q1 g0 Q* N$ b; u# @2 L
set phase 07 C9 d- @- S* J& R# ^
set num-cars-stopped 02 y. Z9 h t: u3 O. G! O- x% u- N
set grid-x-inc world-width / grid-size-x# r6 T/ ~1 t" D
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
# T( l" Y: ?0 @2 Z3 H, r set acceleration 0.099
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) t$ Z: ]! K5 u;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
/ F' U) t0 l1 F/ V;; and initialize the traffic lights to one setting' H# c% a R+ E" W0 C( D( R
to setup-patches
% F: Y6 [! q( {. _8 ~: ] ;; initialize the patch-owned variables and color the patches to a base-color
, q+ i/ _2 S- _ ask patches- U, K% \! c8 T+ Q7 D) D
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: H& S& B' n: [- | a. D: ~" N) I set intersection? false
1 j# u) e: U% U. z set auto? false
% G( a4 F! X2 h4 d S set green-light-up? true8 {/ I* P. t6 O4 P. n. q9 g
set my-row -1
1 {3 n1 T$ N. W: l4 ~- i2 [! w set my-column -1* f M& h) t5 R
set my-phase -18 z W" x2 T( v' y1 A. D+ s
set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets( S1 l. E! y# F0 |
set roads patches with
8 K; J- b0 R) w9 C7 R8 [! O+ B [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or+ E, E; c3 H8 {5 e
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]7 q/ G4 _; l. V- N. Q1 ?
set intersections roads with
/ S0 x& n& Z9 w [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and# `. U; k# r$ Q# @
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]( x! g6 h5 N) h2 I3 W
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ask roads [ set pcolor white ]
# X5 i! z$ o. O' s$ ^ setup-intersections
5 y5 G- e7 ]) Uend$ j: R# \ K* k( x
其中定义道路的句子,如下所示,是什么意思啊?
3 R- P' ~# ^* T1 K set roads patches with2 x+ i$ }( X2 b; ^$ Z3 e$ z% N( {
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or$ _1 j/ ~( U* D4 Q# l" G5 [' l$ }6 N
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]9 c# x1 F/ C/ {. O
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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