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[求助] 在看例子时有几个问题看不懂

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发表于 2012-6-20 08:59:43 | 显示全部楼层 |阅读模式
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。8 C6 f) @% J' q3 [8 {5 l
netlogo自带的social science--traffic grid这一例子当中,( k. z! t/ L# X! \4 R
globals, X2 D! F# ]; {; W( T
[3 l7 N6 J, T* J
  grid-x-inc               ;; the amount of patches in between two roads in the x direction* m2 a9 q3 s% ]5 Q6 t; f$ Z; d- G
  grid-y-inc               ;; the amount of patches in between two roads in the y direction
# r0 |9 A. y# J5 t  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
5 r7 E% W) O+ W7 o! ]; {# [                           ;; it is to accelerate or decelerate
" w, M4 l% P  G! C# X  }& t9 v  phase                    ;; keeps track of the phase! q" ~8 W2 s( m* [2 O% ?& _
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure  j) X/ [3 k/ ~: u3 k6 i; e
  current-light            ;; the currently selected light# I4 a9 n1 f% _# `" ^0 G  r. R1 {
. D# t+ k, _: e
  ;; patch agentsets
% Q, b# n% g* s( Q. r; {0 r5 }6 h  intersections ;; agentset containing the patches that are intersections
2 n: J1 U! a) E# v/ _% o) E4 j  roads         ;; agentset containing the patches that are roads4 o# A4 M3 U- d  b( c( O% N& C5 a
]
5 A6 Z! A7 {, Z6 x
8 ]/ I# r9 V$ k8 tturtles-own- v6 g0 v# ^; R
[" |% P4 F" J% ^
  speed     ;; the speed of the turtle
' A- P6 h9 f4 k7 s; V  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
: Y5 ^- e! C. d  wait-time ;; the amount of time since the last time a turtle has moved
# M- j4 {3 o- {4 \, f]
9 p1 u( @  e$ S$ R8 M. C7 L" i! D3 r( x& q# M
patches-own
" D" x" N, V0 E7 _% a6 A; p0 V[5 u% G- ]9 _! o. r
  intersection?   ;; true if the patch is at the intersection of two roads
( Z( L+ P5 p7 D; E( L  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.' }" a# T& h& E  J; P4 h( O- o
                  ;; false for a non-intersection patches.+ y8 D/ u/ ^# z8 p& N+ V
  my-row          ;; the row of the intersection counting from the upper left corner of the
/ e: f/ w+ ^0 |+ f                  ;; world.  -1 for non-intersection patches.
* d* L  T+ m4 z- K8 r  my-column       ;; the column of the intersection counting from the upper left corner of the! W( b! [- T& ~) o1 d
                  ;; world.  -1 for non-intersection patches.5 P: U# |: ~3 A
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.1 l  l2 O/ Z2 b( _$ a8 O: e- b
  auto?           ;; whether or not this intersection will switch automatically.$ [  v' J9 @* y, h
                  ;; false for non-intersection patches.% h3 K  c8 `0 V% k: l& o
], m# m6 a: G7 u2 c1 k8 k

$ _8 T8 U! c% P4 S( e3 M8 L. N% J
) D; [4 @  ^$ \;;;;;;;;;;;;;;;;;;;;;;  s6 n1 h# X$ [
;; Setup Procedures ;;$ q" y, p7 d! q4 h  N/ r9 D" Q6 z
;;;;;;;;;;;;;;;;;;;;;;3 }, G1 W5 |3 L. z% M
% H& i9 z# _4 l! w( U
;; Initialize the display by giving the global and patch variables initial values.6 _( Z6 P/ R, d8 V. i
;; Create num-cars of turtles if there are enough road patches for one turtle to" h6 w3 I; r8 H) g) H
;; be created per road patch. Set up the plots.' i9 N& l7 o  h2 k" |
to setup7 @( K2 M4 e7 B. l2 O
  ca
; u$ B+ J6 X+ d: G4 g! _: P  setup-globals
  _, G" u( x3 C; r
2 `) Z2 q, ?) u( h5 \+ Z' Q6 Y$ |  N  ;; First we ask the patches to draw themselves and set up a few variables
# Q( z9 r; |$ w. ~1 o$ X& t+ I  setup-patches
" j9 F1 D6 `0 Y" K# ]# _# N* A4 w  make-current one-of intersections; s8 H8 Q7 @6 Q; n
  label-current
0 ^- \' R# ?* G- S% L
4 C# e9 i8 T% k" _( ]  y0 f- o  set-default-shape turtles "car"
% R1 @) @* L# q' J, ]7 A8 d" P; s5 ~3 U5 s% I
  if (num-cars > count roads), E+ o4 K: E9 ]
  [: M$ W  w3 q* o5 y& c
    user-message (word "There are too many cars for the amount of "% j  b, E- d# m+ H1 O
                       "road.  Either increase the amount of roads "# }1 {' J$ E4 M
                       "by increasing the GRID-SIZE-X or "
& P0 c6 e2 H* {. i: `% U                       "GRID-SIZE-Y sliders, or decrease the "
+ A7 ^9 S. D- U8 n                       "number of cars by lowering the NUMBER slider.\n"+ a, u1 m0 ^- |  ^3 p8 l
                       "The setup has stopped.")
; i  {6 A& [5 _    stop$ i/ G) g; J: g3 T& Z/ _+ u
  ]- N/ ?7 A: [7 ?2 l# G1 V
3 c) R3 E8 y7 a4 e# F, G
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
9 ~1 {* U1 Z! c5 X# M. [  crt num-cars
; o0 _' m4 Y& B8 R  [
# [  R/ I6 j* A0 h/ ~    setup-cars; T. q/ M& H4 r4 F( L% J; O3 Q- Z& [
    set-car-color
) T# t) ^6 k9 h3 ]6 j7 U    record-data
6 I: c' P5 @- G8 a# K# ^  ]
/ b- x9 [, t( b, i& A2 s3 \* I: D9 H) H; }% s$ ~
  ;; give the turtles an initial speed9 E5 R2 Q( v' \" l) T$ J2 a
  ask turtles [ set-car-speed ]
* c7 M$ J" ^7 X0 q& o1 \- G' T' k
' B$ ^* b. J$ r3 n8 r; M* d1 v  reset-ticks( d% M- i3 T8 j, P2 y5 P( m( r
end: W7 q- N( T5 ^' N9 E
0 [( b+ c' P+ M( E$ _
;; Initialize the global variables to appropriate values
! Q$ `4 L* R' o' T$ L" n8 y  b1 M; ~to setup-globals
) Z1 l' ?1 F! j) u! U' T$ A  set current-light nobody ;; just for now, since there are no lights yet
  A6 w6 d& s: i& y  set phase 09 _0 y6 x7 G1 J3 e2 p
  set num-cars-stopped 0
+ x$ W" Y% o/ ]: [3 w1 X$ T  set grid-x-inc world-width / grid-size-x
" x9 v0 l( N& \& F  set grid-y-inc world-height / grid-size-y
8 _- x3 f4 ?( |/ b5 j, v: `. w3 m6 l$ s! _/ A+ v6 ^  I
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary5 g6 E  D+ `3 |9 r; o* x
  set acceleration 0.099
* j7 d1 s, i" F( d# K; Tend0 p( c" G1 g' C6 v) Y7 T1 w
$ z5 w) B3 s" |$ h' C/ Z+ b9 s0 C( h
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
7 `: r8 s1 ^$ i: ?- c0 l;; and initialize the traffic lights to one setting
( R  T, b  I! Oto setup-patches
# t+ ?; d% c* Z7 ~  ;; initialize the patch-owned variables and color the patches to a base-color  L0 h$ k2 W( `" f! {+ t
  ask patches9 i2 q/ A9 \! ?2 s4 J) n; l
  [3 _; Q  R3 J7 d3 N- a
    set intersection? false
6 c- b8 A* S& E5 G1 n( P& r' E/ l: W    set auto? false
7 |7 [- O& ?( O    set green-light-up? true' q8 d7 p5 A. J( e& A" M+ T* l$ ?
    set my-row -1
  U& Z7 M: {( I: E9 b. a1 R1 r8 W5 E2 J    set my-column -1
$ b  o4 _3 `6 `9 J: ^  W  g- j    set my-phase -1* n+ Z; q2 n' V' m9 S
    set pcolor brown + 3
6 o, L( G1 \: d( c1 `  ]# V7 G! G; m: S$ r$ Q
) ^1 x! e3 V* M7 Y) ?5 ?( a
  ;; initialize the global variables that hold patch agentsets
4 D7 \. y6 X1 @# H/ [& _  set roads patches with
( q9 \6 k2 |# W+ `    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or% B; l9 W* c5 p2 F
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
) T3 ]; S  F- C; c  set intersections roads with2 V: `; W% R" c9 S2 N) M
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
9 p7 n( m) ~  X    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]8 w+ n% C8 h! ~" Z( Q

: ~6 f' S5 t5 |; j) k  t* J  ask roads [ set pcolor white ]
$ u% A; F* {9 p* f" O    setup-intersections
5 Q- H  K. N9 A8 V3 i) dend
4 L! `2 z2 p3 M! O/ o3 F- M其中定义道路的句子,如下所示,是什么意思啊?
0 q+ R: ^# \- E4 L. \9 ^3 D- s0 O) s set roads patches with# o/ b$ J1 y* t9 ^1 y
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
0 H, k) A, s7 r( C. l* Y! z+ x    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]7 _! f6 r; E5 F8 U6 l6 h4 F4 b) w
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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