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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。
. o7 {5 a! _, x6 a1 t- Vnetlogo自带的social science--traffic grid这一例子当中,; |  z' n: S6 s5 j
globals# O; O4 H6 ^& b% N
[
8 H1 v) N; e# \  grid-x-inc               ;; the amount of patches in between two roads in the x direction
2 z( w" u% N; i7 Y% O+ S# d  grid-y-inc               ;; the amount of patches in between two roads in the y direction1 S- O5 A" _7 @" S
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
: ], c" p  r5 j' f# w: v3 o2 N                           ;; it is to accelerate or decelerate# g6 J+ ^- [/ G# J3 q0 ]
  phase                    ;; keeps track of the phase
4 ^" L3 Y4 i2 G* \0 `4 M5 |  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
/ N9 R( n9 O7 i7 _  current-light            ;; the currently selected light
* J( l* N8 i* p
( S& \5 K- }3 |2 D  ;; patch agentsets& a) O- }2 \6 d4 p& ?- P- N
  intersections ;; agentset containing the patches that are intersections  H" J( ]; V% r$ n" u) B7 S( i) \
  roads         ;; agentset containing the patches that are roads
5 W; Q! G# Y  K]* e1 N7 q/ y. e& i

  r$ ]& \6 F/ k& O) t  Eturtles-own8 C$ W& P" W) m% H& U
[
* V2 r/ z% E% r  speed     ;; the speed of the turtle+ _1 p0 s! m( _% t" I* X
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right* P9 ?* N2 L* [/ j! v
  wait-time ;; the amount of time since the last time a turtle has moved
8 \$ N& o5 O' z9 y4 [" D: z1 e5 W]
! _4 }/ f) {6 }( k4 \3 _3 t3 b  j) j% g/ |/ v2 Q% w7 o  J
patches-own
) l2 X* U: T+ D; t) Z0 |: G! G[; y: B8 Z! E- t, C* V9 D
  intersection?   ;; true if the patch is at the intersection of two roads
7 ~4 s8 c7 C# ~5 o4 y/ a  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.- [8 D4 n+ ]  v
                  ;; false for a non-intersection patches.; |& U2 }6 m8 d" q2 C9 {- W- @
  my-row          ;; the row of the intersection counting from the upper left corner of the
( P: c' M, [+ I( y0 q0 M% l" V3 h                  ;; world.  -1 for non-intersection patches.
+ i  g! _/ ^0 j% n5 q! K  my-column       ;; the column of the intersection counting from the upper left corner of the; _4 M. V8 @  s% k
                  ;; world.  -1 for non-intersection patches.4 X) m2 U- U- o2 A$ J% J) r, |! ~$ M
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
1 z4 T. _4 h' l  auto?           ;; whether or not this intersection will switch automatically.8 L; m5 n1 M0 Y5 j* V
                  ;; false for non-intersection patches.& q# g( e/ S4 C  m
]
5 X6 Q8 a0 h# X
$ E  Q8 n6 K  i# Z7 h4 t
6 A: O. H) D) G5 z;;;;;;;;;;;;;;;;;;;;;;6 D) B5 T% |; q1 ?. c
;; Setup Procedures ;;( j- |( `. P* H; |; y
;;;;;;;;;;;;;;;;;;;;;;) R7 y3 i* J3 i. n6 K" i/ z
/ C) c+ n) b7 _$ X/ h2 l
;; Initialize the display by giving the global and patch variables initial values./ h/ P! T" a  c
;; Create num-cars of turtles if there are enough road patches for one turtle to
: t/ B, \9 w6 V- O' t;; be created per road patch. Set up the plots.+ b. u/ U% w: j
to setup
! F4 [6 r- ^6 U9 q  ca! ^& S1 z2 |! b2 m, c
  setup-globals
9 @) ~# R  y! {  k. [9 k0 t$ l9 Q. s- S1 V: u, Z& M, [) z* T
  ;; First we ask the patches to draw themselves and set up a few variables3 f1 {+ I) I! r3 w6 p7 ?, {
  setup-patches
) f3 S- E, r$ \6 v0 S' q  make-current one-of intersections" L* i4 l. U& e) b
  label-current
) T  c- A, {9 h* i+ i
# N/ B  a3 Z4 e  set-default-shape turtles "car"
4 X& s4 M# C1 c( Z; k- \+ t" B/ ~9 |, x% N& _6 G6 O
  if (num-cars > count roads)
8 t* ]8 d& X( S9 M8 c6 J  [8 \) w7 R9 H. G" R: a3 V; R
    user-message (word "There are too many cars for the amount of "  G' p' I. Y( z2 A* V
                       "road.  Either increase the amount of roads "4 b" r! O" K8 {" q. G# o
                       "by increasing the GRID-SIZE-X or "
" _& M! K8 f( j, ]9 m- c0 h3 ]                       "GRID-SIZE-Y sliders, or decrease the "
7 T7 ~) ], z7 O# E, ^                       "number of cars by lowering the NUMBER slider.\n"7 X, j: Y: ^1 V
                       "The setup has stopped."), X. K9 Q' U0 \/ x" b
    stop
$ u9 f2 @! n( `8 |: m; O# ^  ]8 u8 I' v% x; z7 d6 o) w
) A: V- D' N2 U5 d
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color4 V* C8 f* n. k/ |
  crt num-cars( f  K7 @! I$ c
  [
$ q: A- n( n/ K2 W- M: T    setup-cars
" D6 m) H2 n" U; I    set-car-color/ E0 w! g) P5 A6 |! F7 j( A, x, B
    record-data9 ?! W  p# b& [! E0 o
  ]8 t2 m% X; i* o

6 u0 C  N4 U& ~$ s- s' y  ;; give the turtles an initial speed( M2 p! x) L* p/ l9 S
  ask turtles [ set-car-speed ]
3 l# c! C/ S8 n2 |$ Z# U( I+ o* q: g0 i+ |9 ~5 O
  reset-ticks6 L8 G/ ]( h1 u+ t- M( w# k
end
' V# w8 b! j5 }# R9 V$ w( C% I. s/ _
;; Initialize the global variables to appropriate values
9 W: [( U' E1 P) o3 [to setup-globals6 w. T6 P3 U" b$ k) @, D+ c
  set current-light nobody ;; just for now, since there are no lights yet
" O' I  {1 |% {, d6 g  set phase 0
9 S( i/ e+ a" `, h  set num-cars-stopped 02 a8 E# J$ |5 i5 Q. R6 K4 c4 @
  set grid-x-inc world-width / grid-size-x
2 y# \" Y3 P& H1 e' U0 k, I3 E' D: \  set grid-y-inc world-height / grid-size-y
5 U# ]  i$ `6 \% a1 i) R  E: m/ c. D9 a8 n5 u" n
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
  R1 x1 h6 J0 O- k5 B  set acceleration 0.0991 X  F$ g! v1 j( Y$ o8 ^& ?3 w
end
% M4 F" K: R- T! h$ Z
; @( l2 n3 D4 g;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
3 J5 v& o/ e5 v7 H;; and initialize the traffic lights to one setting3 n+ v# D- ^. R$ L* z
to setup-patches
8 v/ y* A5 a  y" x  ;; initialize the patch-owned variables and color the patches to a base-color
7 H+ b( [( A. T% }4 T' l' L: i  ask patches
; ]& h) w  K% r! a% q" t1 S6 A  [  _9 H5 ]" b" s# n$ L
    set intersection? false
. X! h/ v( g  L6 C, c; x( o4 d6 v: g    set auto? false# A8 l5 h6 y% D7 @2 f) x; c' s
    set green-light-up? true- F* d* z$ C" r$ o9 @
    set my-row -1; I! N% k1 N5 p* U2 c0 ?; u, b$ _$ F
    set my-column -14 m* F) j# j3 z/ }7 F) Q
    set my-phase -1
7 G9 k+ S; @, n: _2 @3 F  e    set pcolor brown + 3
3 N7 v9 w% {. ]) G- z. b9 p  ]* c5 K3 @: O8 I0 v8 n$ r0 @; T# g
  }" \; p2 n& U7 E
  ;; initialize the global variables that hold patch agentsets
$ b; S/ G+ G/ c+ l8 v& v2 p  set roads patches with
' `+ U9 O& r, S- y/ N    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
$ t5 {' G8 Z9 @+ s    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
/ ~. s( }+ X- g3 E: ^, O  set intersections roads with
4 w6 ^! _* g& T( _1 _2 X    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
, q! F$ k, i6 z( `4 X3 v. m    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
! P8 h3 f  S: s; ~/ E
6 E. x  @* |. [3 u6 K1 d5 G2 d# V  ask roads [ set pcolor white ]
3 C$ x$ h/ [: T$ o2 ?( K    setup-intersections
' \9 P3 o; r- |; v/ |6 h9 dend
' ?+ H" T2 C+ M. {其中定义道路的句子,如下所示,是什么意思啊?4 z& V& _. j+ p, |- z; H. ^
set roads patches with6 c5 T" f8 d  D! k8 V1 a
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or  m7 O7 z' G) B
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]. \# b1 o7 j4 q0 j) ?7 b
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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