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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。
% }, u. }) N5 znetlogo自带的social science--traffic grid这一例子当中,
" j) k6 a- X. [globals6 m$ r, ^- n; m) A. f2 O
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grid-x-inc ;; the amount of patches in between two roads in the x direction
1 U: i+ a+ s0 [" K8 X grid-y-inc ;; the amount of patches in between two roads in the y direction
5 n! x) h2 k. p) ]5 n2 o# K acceleration ;; the constant that controls how much a car speeds up or slows down by if
$ b2 {2 Z5 G# K1 W& c, R ;; it is to accelerate or decelerate
9 A. s" n5 f# {2 b1 m$ ^3 D phase ;; keeps track of the phase+ v- @% U. o |( c
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
0 ~3 X7 [, r# _5 H2 ^; K* r, p( t current-light ;; the currently selected light
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+ L, f( s# r+ f# B) T; O ;; patch agentsets
6 B, O5 r }; b! B2 x( j8 x0 s# W intersections ;; agentset containing the patches that are intersections
; O- F, D t1 ^+ c; `( x roads ;; agentset containing the patches that are roads3 N& Y. J* ~+ p! I
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turtles-own7 w$ N3 i8 G e
[
; u/ X" O: n) q# t s) r! ~, G speed ;; the speed of the turtle6 q$ ]3 Y% Q2 j0 U( ^
up-car? ;; true if the turtle moves downwards and false if it moves to the right
) T# }3 @# W' n9 ^7 z ] wait-time ;; the amount of time since the last time a turtle has moved: D7 u! d o$ t! s0 l' S0 ]
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patches-own
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' r. G$ E6 ~" M+ o& z intersection? ;; true if the patch is at the intersection of two roads) n" @: Y% G) A& u) u- W% P
green-light-up? ;; true if the green light is above the intersection. otherwise, false.9 L' O: {9 n0 g! h
;; false for a non-intersection patches.
1 v2 R/ V0 y# d% E0 b my-row ;; the row of the intersection counting from the upper left corner of the" Z% H8 p2 a! m$ b5 [/ v
;; world. -1 for non-intersection patches.
$ E/ ^% \7 K' _8 M+ _& |4 q my-column ;; the column of the intersection counting from the upper left corner of the
8 G7 E% H# y6 U* W- H# E ;; world. -1 for non-intersection patches.
3 s1 G" J% L& Y* M my-phase ;; the phase for the intersection. -1 for non-intersection patches.0 C2 N; K0 n/ f$ M
auto? ;; whether or not this intersection will switch automatically.3 V( y$ l! I ~; P) @- p7 [
;; false for non-intersection patches. v' u- ~6 V, d0 s2 T( i" e' z2 n
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% w* V* w6 ?1 |; O! A+ ~;;;;;;;;;;;;;;;;;;;;;;% G: ^% [) F2 g8 L& r
;; Setup Procedures ;;
, T, p- c" I1 J$ V+ \# E6 }1 N( `;;;;;;;;;;;;;;;;;;;;;;% O1 b2 ?8 |" {: r" t8 c7 f
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;; Initialize the display by giving the global and patch variables initial values.9 o9 o* I, U8 {. |# B* k% r5 X$ S- H
;; Create num-cars of turtles if there are enough road patches for one turtle to
" Y h1 L* X/ |; t5 P- T# r;; be created per road patch. Set up the plots." @5 U- W* q/ ~+ \/ K& ^+ [, Q
to setup. s1 z; q! C/ P
ca
: P/ z0 _8 i# y C) } setup-globals" {) q( h3 C) b4 I$ f3 \7 T- E
, E2 ]( g J! \ ;; First we ask the patches to draw themselves and set up a few variables
% k8 y/ r7 a# o2 r- {! E setup-patches
" w/ J. ]: v$ m! w; x make-current one-of intersections5 W0 ?- j0 z+ y- ^7 q4 |1 m
label-current
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0 a4 N# a' U0 T1 F0 w" D7 J set-default-shape turtles "car"
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if (num-cars > count roads)
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9 |; o- P9 p) H ?, G user-message (word "There are too many cars for the amount of "
7 v/ X- {. W/ R% y X7 f "road. Either increase the amount of roads "1 S2 G/ h( H2 ?; n8 k/ o. ^+ q$ B. a
"by increasing the GRID-SIZE-X or "& K; k' U5 N1 O' x. u
"GRID-SIZE-Y sliders, or decrease the "
a/ a3 A8 C- {, e0 d, X8 Z "number of cars by lowering the NUMBER slider.\n"; f1 N/ @" h% ]
"The setup has stopped.")
) O% n2 |1 S% | y5 L. o stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color; p2 n) Q* `. I W# }& a
crt num-cars
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setup-cars
% j: @ D& j7 m6 E4 o6 e, I set-car-color
1 ]* @+ x+ H+ F# `4 P6 T record-data
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( Z8 K5 y8 \5 Y8 V8 } ;; give the turtles an initial speed( q" H2 @/ n$ |- d5 |! b- {' ^
ask turtles [ set-car-speed ]
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( y9 I$ j* n6 E; [) n$ E. ? reset-ticks3 V( X5 L( N; g& k) j& x( p
end: ^) u( z* @1 v
0 a9 b$ K2 m& I) ?3 G: a T;; Initialize the global variables to appropriate values
2 O& ?" F8 X: [9 Q3 R6 Dto setup-globals
5 I3 \% M' |% M i set current-light nobody ;; just for now, since there are no lights yet5 M3 R' g4 q9 Y; J
set phase 0( V2 d' W" o2 z3 V+ |
set num-cars-stopped 0
/ ]9 o2 |2 ?' e/ p# v& U( n set grid-x-inc world-width / grid-size-x
( }' T9 U z; T2 M3 E, y 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
' ^. ~. B" N% o9 Y& v( K( h9 F set acceleration 0.099( J; T. H3 I% w7 J2 l: t6 K
end' g4 e, M4 ^! L/ J7 w
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,2 H3 O& l% l8 s, Q
;; and initialize the traffic lights to one setting
3 [( Z7 Y* ?- ]' h, m; ?+ G/ wto setup-patches9 n- U1 g/ N# p, s
;; initialize the patch-owned variables and color the patches to a base-color
- D! \4 |9 M3 F {0 c/ ` ask patches
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set intersection? false
. j0 q% n; e" d h) X$ x r set auto? false
. G* d' ^$ Z, t8 w8 L w( J set green-light-up? true
: X+ `0 R) |9 N, ]5 t, h set my-row -1( X8 X& ~ j' m* L$ T
set my-column -1
1 K" K% F" l8 ^4 L7 | set my-phase -1
+ r0 C) Y: c" k% V' P set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets8 s* U0 m& l* I! K# D+ ^, p( d
set roads patches with) m; B0 N; S) v: Z
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
" c1 M* h5 a# O* t/ X; n5 i4 t (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
8 b/ Q- W6 b: T; O set intersections roads with" |0 e* p, x D3 I
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and. F7 i" w, @; i! y& h
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]1 i/ G f8 o, v" B: N2 E7 ?- F
setup-intersections
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其中定义道路的句子,如下所示,是什么意思啊?
2 c7 y7 z1 ^* \$ z set roads patches with
# ]$ I N- e1 K, } [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
# x' g: o$ g3 s1 E! ? (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
' J8 I4 {: o; _; O7 l! ?/ ?: 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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