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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。
4 i. A4 p# _+ ^" {& s' j/ Snetlogo自带的social science--traffic grid这一例子当中,
8 D t0 i5 h& V# J4 J. V+ ^globals
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& u M& h9 n9 c# @1 D grid-x-inc ;; the amount of patches in between two roads in the x direction9 _# y5 Z1 {2 s' }( T* ~8 M
grid-y-inc ;; the amount of patches in between two roads in the y direction
# g% j6 R) J) h2 _ acceleration ;; the constant that controls how much a car speeds up or slows down by if
, z( ^5 }4 S6 W$ ?8 E ;; it is to accelerate or decelerate
, R) J- `/ N) {0 Z% I8 X phase ;; keeps track of the phase! E* y% \* h* I9 r: l+ l7 k4 G
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
. x4 @1 }3 \. G/ ]2 n% y current-light ;; the currently selected light
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;; patch agentsets
* C3 A: @2 T# E9 p intersections ;; agentset containing the patches that are intersections
, l- X* Y) y# h# V& { roads ;; agentset containing the patches that are roads7 L& _8 G2 ]4 g
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0 ]! d/ d0 q6 J! `$ M0 ^0 U m' Q7 cturtles-own6 \9 a6 U3 q4 D" R: f3 }% e2 w% J
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speed ;; the speed of the turtle' E3 |4 y% J& h0 L3 O
up-car? ;; true if the turtle moves downwards and false if it moves to the right
* x* ?. G$ r% z- |1 P7 Z wait-time ;; the amount of time since the last time a turtle has moved$ r( U( X% e9 k6 z$ E T! l& T' H& z
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; W8 t6 ^2 ?, W/ C% U. ?patches-own
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intersection? ;; true if the patch is at the intersection of two roads1 e+ K$ q; w' }5 O/ A; K6 H
green-light-up? ;; true if the green light is above the intersection. otherwise, false.9 J) ]4 f; ?6 U
;; false for a non-intersection patches.
6 p% Z" O- E( |, U9 Q4 }9 o my-row ;; the row of the intersection counting from the upper left corner of the, ?6 A) f' S$ R# i8 J, U
;; world. -1 for non-intersection patches.
! E+ s) d4 `! _ my-column ;; the column of the intersection counting from the upper left corner of the
3 M+ @4 u y/ i, Z; r4 |# f ;; world. -1 for non-intersection patches.4 J' Y+ c# B2 y6 D
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
" d Y9 l" n; x! u4 ], q auto? ;; whether or not this intersection will switch automatically.& C. M! Q' {" ]# m. k% Q9 }, c) ^
;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;
$ A: G; z* m: Y% u. n;; Setup Procedures ;;& r7 O0 o ]9 D7 O
;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.
% B' F9 L7 `! c* y- h) o9 `;; Create num-cars of turtles if there are enough road patches for one turtle to. K1 L4 \ F* [* A. W6 [
;; be created per road patch. Set up the plots.5 U7 T: g; W9 ?( L# K. q, v
to setup
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;; First we ask the patches to draw themselves and set up a few variables2 r4 M$ J5 R/ q5 j) |5 ^6 {
setup-patches5 G0 e/ Z. x, @9 Y
make-current one-of intersections) k( H4 v& x+ J8 B: ?5 g
label-current
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8 G: W+ v- [& H) O" U' b! B set-default-shape turtles "car", R2 X& J) L6 g: V' w
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if (num-cars > count roads)
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# O9 F7 `- q! i/ ?, ` { user-message (word "There are too many cars for the amount of "& Z- T, J: J6 y! ~! E( n/ [9 J
"road. Either increase the amount of roads "
4 m4 q6 g. ^! Z "by increasing the GRID-SIZE-X or "
4 z: k G2 c; V9 V L$ q* U "GRID-SIZE-Y sliders, or decrease the " _' p; E7 d" V; q& W# e+ o
"number of cars by lowering the NUMBER slider.\n"
, W1 W% `6 s% G0 C: X "The setup has stopped.")" c/ ^; J: B4 w6 l, w
stop
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4 {" D% N7 c1 u8 A1 o ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color2 `' z* Q+ y* y% [3 }% R, V3 S- c
crt num-cars8 K" I, ~6 B. f. R
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2 F" C% k+ u0 d$ j setup-cars
+ ~, t. T2 ~3 E/ V+ W# p9 Y( z set-car-color
# `9 x5 r" J- c N record-data) a- Q8 X g$ V
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" b' \. x# ^' Y$ Z7 J& F3 Q ;; give the turtles an initial speed
, j. t5 f. w6 M: y7 S ask turtles [ set-car-speed ]6 k* V9 c0 Z+ D
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reset-ticks+ E" _3 l* p! ^0 [! T+ ?1 p
end
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;; Initialize the global variables to appropriate values R( ~6 @! ~, m( \7 _; ]
to setup-globals
' G( p2 ]2 J0 m! H# D: ` set current-light nobody ;; just for now, since there are no lights yet
$ ?" v8 ^3 T y5 c9 R5 ^ set phase 01 G |, A1 M2 z
set num-cars-stopped 0) R3 H% Q) Q$ o/ C2 ]
set grid-x-inc world-width / grid-size-x( L5 E- ^& ^7 a( S2 A6 d) r
set grid-y-inc world-height / grid-size-y( w# q9 H$ S( \0 d$ |" V% j6 l
9 e. n3 G3 }+ Z# T8 f' s; e: P ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary& _: P0 F! u1 E& [, s7 Y) M3 h# h
set acceleration 0.099% O" p* G) N+ X$ I# Q+ @! h
end
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2 W* H. w, _. r3 V9 ?; S;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
/ o3 b) S: Q3 k" k" ?# U;; and initialize the traffic lights to one setting
( ~8 L* O$ j: M: O2 j5 S" Ito setup-patches8 r& k5 ~- V7 S
;; initialize the patch-owned variables and color the patches to a base-color
( L% R0 q& k3 P7 w) A2 \6 Y* l% f0 ^ ask patches
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# l4 y/ k! s8 w5 f- W set intersection? false
9 F' o1 c: \7 a. q; L' j5 W8 q8 A$ \ set auto? false
6 i: _8 h, K3 G1 [$ Y- S; D set green-light-up? true8 e4 i0 d: H1 D
set my-row -11 ^) ^: q1 H! _$ ?$ y
set my-column -1
+ U7 g7 P* F, A set my-phase -1
, w. r% w+ H D$ A. V9 L$ j set pcolor brown + 3* C, U4 V/ o( n y! X
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5 {6 Q" ?( @+ j" w; p+ j ;; initialize the global variables that hold patch agentsets
5 d5 h* T3 c- }+ W# v. H set roads patches with
7 T( W b! N1 Z9 W' `1 n [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
9 C, `1 k8 x& e8 N+ e' I* w (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
: v+ A _# l# ~2 U4 I0 [ set intersections roads with: D/ j7 D. h& d/ H% a/ z+ u& z
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and4 ^2 G" x4 ~/ C# J$ C
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]6 p5 v0 E3 b& L9 [" |* b# Z2 @
setup-intersections
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% R, C) x; z& v; Q* Z其中定义道路的句子,如下所示,是什么意思啊?
0 _1 p+ K( T% ]! @+ H; H' h, { set roads patches with
! ?# ?% w8 V8 w8 |* C4 |) p [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or* j; j4 \2 c, B- v
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
4 P- W+ S6 w1 T' ~1 q' c& u% Z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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