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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。
0 q$ U% d1 I: `$ ~2 a' d( @: Pnetlogo自带的social science--traffic grid这一例子当中," n* z  h/ `1 O
globals6 e2 E% @& V: p( d/ m6 _) ~
[
, ~+ l- P4 d. h/ o8 k  grid-x-inc               ;; the amount of patches in between two roads in the x direction
7 L) {. G' @7 Q) Q; J* q  grid-y-inc               ;; the amount of patches in between two roads in the y direction! W5 J- v, M& |# p# G& Q! m! U) v/ f$ l
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if" w' F+ r' C4 P& ^/ I% B4 C+ Z" R
                           ;; it is to accelerate or decelerate3 C! \( A) P" g; u
  phase                    ;; keeps track of the phase
; W$ ]- L0 b# t% D' T( R3 q  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
" }% b9 y: U0 a' }  current-light            ;; the currently selected light
6 h5 m  ?0 _: \* B+ t
, R& P0 o: {1 Q# g6 \  W  ;; patch agentsets, R' b( U# @8 V, p
  intersections ;; agentset containing the patches that are intersections
) X+ T' k/ Z  `2 i' v  roads         ;; agentset containing the patches that are roads
# [' w! E( U7 {2 M, v]
, W, w/ W  x( x
; `" h: ~. C. n2 L8 U. C/ v5 Jturtles-own
& X6 V2 g9 D" ^; ], S# w* l6 Z[* b0 M: A4 ?. `
  speed     ;; the speed of the turtle# H* e" ?( u$ @( v  |4 R
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
  Z, N; \! Z9 Y: J# g* h  wait-time ;; the amount of time since the last time a turtle has moved1 Z/ a( U: ?0 Z" [- _. e% f! S
]) P/ P* f3 [2 g3 C0 F1 ^
5 i, T# V3 S/ j9 k0 Y- G$ Q
patches-own- k# g/ C( l: z6 {8 C. X3 v
[
$ Y! n5 K% k; X  B  intersection?   ;; true if the patch is at the intersection of two roads
4 @) P% q; X& J- e- j  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.* G! j7 B4 B8 P0 V6 \
                  ;; false for a non-intersection patches.
0 {& B# ]; q1 M3 S3 u  my-row          ;; the row of the intersection counting from the upper left corner of the4 M# \5 W9 {; w' i8 |
                  ;; world.  -1 for non-intersection patches.
4 w$ F6 B$ E2 [8 y$ W  my-column       ;; the column of the intersection counting from the upper left corner of the* y' Q( F" p. v2 j& ?( A- `6 n
                  ;; world.  -1 for non-intersection patches.
% q$ l' Y& l6 `6 Z! ~2 G: Y  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
% o. X& x9 U4 `3 @) S: }: t4 |3 e  auto?           ;; whether or not this intersection will switch automatically.6 Z' Z# `. d/ }1 o
                  ;; false for non-intersection patches.4 M+ m1 Z# M$ ]; v
]
% i$ r! G8 a! i% B$ a
3 e: ?% j7 [) G  |! ^5 W, u, r- x) e8 U
;;;;;;;;;;;;;;;;;;;;;;- x7 u6 R2 O; n2 u
;; Setup Procedures ;;4 M7 v1 Z+ w# n! h" Q- {
;;;;;;;;;;;;;;;;;;;;;;
8 |+ Y) }6 `9 E, n% H/ K% v; S* Z6 M, T
;; Initialize the display by giving the global and patch variables initial values.: [  E3 h* n7 [4 F# E7 k; t1 Q  T8 z9 y
;; Create num-cars of turtles if there are enough road patches for one turtle to
4 G# ^5 k. M/ _( T2 q;; be created per road patch. Set up the plots.& T, b4 ~: d" \% f, `& X
to setup$ Z+ E0 k4 }0 ^# _
  ca' Q  l. D# F1 }7 Z  X% F
  setup-globals
5 {7 f. ~# V- r
6 q' i7 O1 g! u; E  ;; First we ask the patches to draw themselves and set up a few variables4 s: S, U* f% `% T
  setup-patches( s5 T& _% t; {+ E7 x
  make-current one-of intersections
. M* |  H% E/ p  label-current& y- g8 K/ T( e! r8 I8 c! G4 t
+ r$ C2 a7 A! [8 U; a+ f0 y$ C5 o
  set-default-shape turtles "car"
' `& w( C$ v6 S! s1 y
! `: m' q6 w8 U7 H! H  if (num-cars > count roads)
$ K" v8 b: B' f1 W( d" g  [
8 w! N# {5 `. I, a    user-message (word "There are too many cars for the amount of "
) H  }. T" N+ s1 u5 i, h                       "road.  Either increase the amount of roads "/ K* z* {9 T: T4 ?6 G
                       "by increasing the GRID-SIZE-X or "
" L, E6 v! r9 y5 E! F' ^6 ~6 x                       "GRID-SIZE-Y sliders, or decrease the "
- Q; c0 H& Y1 K6 N                       "number of cars by lowering the NUMBER slider.\n"' E* B# N" {' g  \9 F  Q
                       "The setup has stopped.")
, _! o! j0 H  J6 d) M* D    stop& q2 w9 L3 X/ K* }6 _
  ]
, M7 S# Y6 h" \2 s
% f: p; T' D# a  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
5 D0 z+ ^9 Z% m6 Z  crt num-cars
" P8 \8 w$ Z' }4 H  [3 C. G, v3 p9 J6 k/ r# _
    setup-cars
8 o% J  S' d3 ^* i0 @- C# O' Z+ T    set-car-color+ E. W( X* C+ k3 i/ F- B
    record-data
( `* G8 t6 Q! S* t' m  ]
6 B% q$ w" q1 B2 g4 W2 |( @8 P  X+ k+ d  E0 j0 t* s$ F: q
  ;; give the turtles an initial speed1 J4 f  _" C+ z, V! {2 Z
  ask turtles [ set-car-speed ]7 \; L* p* I, g& Y
! ^4 D. Y  }9 E6 C! I
  reset-ticks
, k/ O. D* O6 q: c5 zend; z  P- s9 J; r

% c/ `: g: H1 e;; Initialize the global variables to appropriate values
7 y1 p; P( ^/ k# Mto setup-globals
5 ~+ v4 s2 C$ L5 ~5 W% B# w  set current-light nobody ;; just for now, since there are no lights yet
8 r7 f$ x6 g- Y, [1 b9 i3 I  set phase 01 Q) d7 Z; N% L- V1 m* E
  set num-cars-stopped 0
2 B$ T' {( e% |; D$ e  set grid-x-inc world-width / grid-size-x$ v5 Y+ s+ r: K% o$ [/ S8 u2 h; d
  set grid-y-inc world-height / grid-size-y) u0 }, f) e' E0 q  o
  }. ], t, }8 _* _+ t; k
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary2 J/ I$ p/ K5 F: I
  set acceleration 0.099
* L. W- f0 {0 K  n$ y4 T9 H% kend
# ]$ G. w( ?2 j0 n( g" q" e* T7 `( `7 y
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
; L1 v, L- G9 y; P% e1 z;; and initialize the traffic lights to one setting
1 i2 e! T8 x0 Fto setup-patches
+ {, ?: l  O" U9 G4 l, s  ;; initialize the patch-owned variables and color the patches to a base-color( B. Q+ a4 A! J9 q' x6 I* l
  ask patches( z7 a! H! g/ J2 p" H
  [. l; a& n( m+ @7 {& p2 q5 c
    set intersection? false
( g6 T; I. y. j  g6 E  J    set auto? false! ]( _' Z9 s2 q( _! J2 X8 J
    set green-light-up? true
- Z/ _2 S* H5 N3 A" B    set my-row -1
9 d  f5 ]( p# S! J) j    set my-column -1* L# w& A: x. E% H+ Y0 s0 ~( d/ ^
    set my-phase -1# u8 V: I7 F. C  b! f
    set pcolor brown + 3$ ]5 Q# c  }# C# ^  H5 g3 ?
  ]+ L4 J, A4 L2 D4 ~% M6 ~* V9 N+ \2 S/ e
! r2 v! q+ x% ^/ ?5 P+ n0 P
  ;; initialize the global variables that hold patch agentsets# o& N+ Q  B% X; z3 x8 J
  set roads patches with) |6 v2 V' L; B3 U) ^6 l
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
- y/ o8 O) a: n0 J    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]: @+ u1 W' X9 \+ p2 l
  set intersections roads with
3 H$ Q& u2 ]" g1 c( b* ~    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
; B; X, I: Y2 F* K" Q    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
9 M' g2 o; x- Y0 }: f4 ]9 e* l2 b' b  v4 b/ b
  ask roads [ set pcolor white ], V/ w# n: y$ W; a/ r1 v/ ^1 S
    setup-intersections
/ r9 ^/ A# k/ X1 Y$ aend
* D# j. A- O8 z/ j其中定义道路的句子,如下所示,是什么意思啊?' Q% P7 ]" ~! N# U: x
set roads patches with
$ t0 }- G5 g8 T8 a! H5 u4 {    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
! O. w8 Z. H$ ]$ M" L+ R# P    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]; M* x2 g( J7 n
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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