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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。  Z! s9 d7 A. ]  h# K7 Y
netlogo自带的social science--traffic grid这一例子当中,
3 x3 X0 a6 j( u6 e5 d! J; ~globals
: F; m  J) K& I$ m# k8 R9 o: f[
5 w8 u) K! \( i' Y# C& k  grid-x-inc               ;; the amount of patches in between two roads in the x direction/ w6 J2 D& D+ T# `- J4 b. w0 \
  grid-y-inc               ;; the amount of patches in between two roads in the y direction
# a. D. _$ _1 |  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
; m: A; Z4 H- m+ K$ G# N2 ^1 F                           ;; it is to accelerate or decelerate) }6 a" G! o/ r3 f+ ^5 R; J
  phase                    ;; keeps track of the phase
) I% W* R) f5 I3 M  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
: w  Y, V' Q" d6 n) G  current-light            ;; the currently selected light9 i4 N9 o& M  D' ]4 S  Z
* ?' ]/ H- [7 g
  ;; patch agentsets
5 H% C& |! V# A  intersections ;; agentset containing the patches that are intersections$ z3 i/ n9 o5 y( g( X
  roads         ;; agentset containing the patches that are roads$ R, K' F$ r& F0 t
]4 I/ h+ D9 r' g/ f4 z3 s! t( M
- E5 a  D3 g) ~& d
turtles-own
3 R+ h% A2 E7 u- f9 f' d[3 D7 e$ N3 i7 Y2 k9 C7 A0 n: E
  speed     ;; the speed of the turtle
  }0 _6 ^; M* o! v7 ]  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
2 \4 p" M6 }. `& p7 F% o) t( `1 [  wait-time ;; the amount of time since the last time a turtle has moved0 F! M% e6 c" F, b
]
! G- x5 {6 T7 F. R8 }. }  J" c0 R9 g; Y; H5 U7 c) Q
patches-own/ Z' `  C8 @3 G& `. h. B6 ^2 N
[9 i9 J4 `7 g" q" x) ]6 s
  intersection?   ;; true if the patch is at the intersection of two roads
; j! `( l! l1 Z  l/ v1 h  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
1 l5 w' p/ a) w# {                  ;; false for a non-intersection patches.
' U2 P$ i. T  h6 ?5 L5 S; P  my-row          ;; the row of the intersection counting from the upper left corner of the& j$ y1 w' Q+ H9 i' C5 c% N" `
                  ;; world.  -1 for non-intersection patches.3 `* N+ `1 V& e0 s4 O& o3 |1 n! b9 ^
  my-column       ;; the column of the intersection counting from the upper left corner of the
* W; }$ U) `  O                  ;; world.  -1 for non-intersection patches.
, M6 B+ I' \" B! r" V/ r) _. w  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
; W: P5 b# F& D8 F9 m  auto?           ;; whether or not this intersection will switch automatically.- N1 o) a7 n, T) ?+ |. }6 g! n
                  ;; false for non-intersection patches.  d7 f- U* o3 ]: e- j) H& y+ q9 ~2 a
]  I" h0 ]/ Z6 l) t! z7 K4 K/ f
8 L7 G  n4 N' E' I* }0 h

9 N7 i# J/ }& i3 ]+ i' M2 M1 h$ b;;;;;;;;;;;;;;;;;;;;;;
# C% A) ?0 ?5 @;; Setup Procedures ;;: r' u" L$ b1 W+ r$ ]  L5 l
;;;;;;;;;;;;;;;;;;;;;;+ f( B+ Y, C& Y5 T: T, V$ b/ r
- l; t  o  {; _6 {5 S% ^  u
;; Initialize the display by giving the global and patch variables initial values.( o2 i# s/ f* }( m: Y9 Y
;; Create num-cars of turtles if there are enough road patches for one turtle to% H- x! W& K- I
;; be created per road patch. Set up the plots.4 g( g+ v2 D8 E1 K1 }' ?
to setup, A" l  L) [8 h5 t/ n6 J! w
  ca
& j/ y) K) v" x: Q! ^$ P  setup-globals
: O: C- s" F( J& c  k
9 _( [  l8 i+ D, k" n- r# l! k  ;; First we ask the patches to draw themselves and set up a few variables3 h4 x, R9 q8 m4 u: v
  setup-patches
2 h- O/ O5 u! S0 c8 E7 w  make-current one-of intersections4 O1 b: a! k  |8 Q$ N4 r$ U
  label-current
# Y8 D# B. ?1 u" m) a& f  }  ?: w2 \0 e( D2 W8 K
  set-default-shape turtles "car"
& n4 o+ I6 F0 K! {5 |
0 e" s5 y0 D9 t7 j# a2 s1 s" _  if (num-cars > count roads); A% }! v5 c' x/ ]. i6 {. {: _
  [
1 o* J" u) R. H( }& h. t6 |    user-message (word "There are too many cars for the amount of "9 j4 |# _* R! n& c
                       "road.  Either increase the amount of roads "
0 V& q# ^8 n1 o1 \) ?                       "by increasing the GRID-SIZE-X or "
  p# {% n2 _: T. m: s- d2 g, N3 @, H                       "GRID-SIZE-Y sliders, or decrease the "; k2 L( o/ M6 I% a& e
                       "number of cars by lowering the NUMBER slider.\n"
/ f% W& Z6 h5 G# p5 m+ U                       "The setup has stopped.")
% p. I; v9 h4 N2 ~/ ?    stop
+ I% h5 a7 Z$ B( g/ Q  Z1 F+ c  ]
/ l: T5 Y& o% G: t3 H
) {& `. L! l, v' F6 t2 w& C" x  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
1 q9 v' C2 ^0 K  crt num-cars
$ ^2 i! i! R% ^% g  [  Q4 R8 X" r4 X( B: P& {
    setup-cars
' U% u! Z3 Y: j5 j    set-car-color
# J" ^  P: q( B4 i    record-data/ {( G4 R7 F3 {& l7 Q
  ]
/ P. n; {6 n: W
$ V" ^1 M  Z8 P9 |+ ]  ;; give the turtles an initial speed% ~9 v* T; n9 X) E2 H  \8 }
  ask turtles [ set-car-speed ]
) o( Y4 ]9 a3 l8 o/ j9 f5 f
9 t) W) C( }/ G# s! i0 v$ l  reset-ticks' _4 y% e" q6 S. ^: J9 [6 u  [6 F
end
; H4 I8 C3 I2 P3 Z2 h3 u
- L4 v8 s2 a. D# g  O;; Initialize the global variables to appropriate values/ S! p% m1 N2 }7 p7 k" C5 ]; O+ z. t
to setup-globals/ P3 S) b( Y" f: \% c& S
  set current-light nobody ;; just for now, since there are no lights yet1 g2 h  f* j7 S8 D+ ~3 U6 R
  set phase 09 @( f, \. i! `2 u7 m4 L
  set num-cars-stopped 0
' _4 e. p" m) S! i  set grid-x-inc world-width / grid-size-x9 L& u7 q1 i: ^
  set grid-y-inc world-height / grid-size-y$ \# v1 ?- w7 k( |6 Q1 C' w* P
- z3 K! k2 f* q! @) q8 l# {7 G! s1 }
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
2 T+ R% \/ X% f  N  set acceleration 0.099
: k# i2 V+ @$ X) Iend4 L; g/ N: F7 r1 i5 W  x4 c

0 s! ~2 u8 @7 B( p2 [. t4 O/ H;; Make the patches have appropriate colors, set up the roads and intersections agentsets,6 K7 Y8 c6 T; y" f/ b- V
;; and initialize the traffic lights to one setting3 C) ?: c8 R: h8 ^4 `9 V1 o% b
to setup-patches
! v; j" q) v8 }8 ^: N" X  ;; initialize the patch-owned variables and color the patches to a base-color
) k9 ^) h: X7 T  a/ b  ask patches3 e4 B9 k, r* ~5 G/ ~
  [
$ ^! Y  O. J! U+ s2 z+ ?8 p    set intersection? false, X) T  C6 r4 f" ~7 g
    set auto? false
0 d# c; x- o/ n: U& Q) N! W0 W5 p    set green-light-up? true' U" h" _$ j* Y! \# J
    set my-row -1; n8 f/ E5 I6 N$ M3 B4 i1 R
    set my-column -1
# G" }& X+ m8 v9 B  o5 L    set my-phase -1
! v; H. P  B- F    set pcolor brown + 3
% F. X  ]2 k# Y5 |! M4 s4 a  ]( V( C$ T. f7 o$ Z& j9 p, k
5 f! n" r7 b; a
  ;; initialize the global variables that hold patch agentsets
, N9 i% L! R% i* _8 X7 v  set roads patches with4 @' M$ c$ c) p# R+ c8 a( Y
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
; o. F4 m: y9 D* \& b: L0 N. Y    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
' ~4 V& F) }0 b* c+ `9 P) z  set intersections roads with! z, m6 ~0 d- T3 ^2 r: W0 Y
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
' N# t+ F; c3 _" V8 G    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]# m" O7 R7 G* B: P( g0 a
4 S, K* a) Z6 b" l& W6 {
  ask roads [ set pcolor white ]
3 p9 r6 Q8 E8 l$ Y    setup-intersections4 W/ @9 t, W9 J" l4 L/ `  p
end
! O# M" L) f9 E- g其中定义道路的句子,如下所示,是什么意思啊?
' U6 A) b( i% E' d set roads patches with, v- S, Q8 \# f2 I! A
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
4 a. `( i# n& }( S- m( E    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
( x' p9 E+ N* m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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