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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。
" ^9 {$ z$ L) w" q& h$ _netlogo自带的social science--traffic grid这一例子当中,' K8 V* I) d! y' k  A
globals
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  grid-x-inc               ;; the amount of patches in between two roads in the x direction$ |3 L3 w4 ~5 K4 i7 ?8 j7 A, v8 I
  grid-y-inc               ;; the amount of patches in between two roads in the y direction' y* N) l8 P+ |1 b% @" H4 n2 w
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
" p* I- R5 x% u( |  w                           ;; it is to accelerate or decelerate
. V' |* M" Y; [  phase                    ;; keeps track of the phase& w: e; M1 Z0 ~# l' ]. g
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
3 Y* b& p! ], g" a& E3 F  current-light            ;; the currently selected light" Q; Y6 b  M( r# A
% {( S: }4 {/ Y3 B, U, b
  ;; patch agentsets
1 S5 H( k/ C, P( S6 _  intersections ;; agentset containing the patches that are intersections
0 W! P; R* @- [+ C! C" u  roads         ;; agentset containing the patches that are roads
% z! C% l% e( l# m0 }]. _: x3 K1 z  @7 M7 v
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turtles-own% i8 j/ ^. u6 s( z
[
6 P9 B6 K: u) P0 _' f& y  speed     ;; the speed of the turtle
0 f8 W, u' x1 V: d3 f  up-car?   ;; true if the turtle moves downwards and false if it moves to the right( y6 W1 q) E# S9 E8 l' N$ ]
  wait-time ;; the amount of time since the last time a turtle has moved
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# G2 b' y& I5 z) K( b* m0 D% x* y' x
patches-own
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1 p' o( y+ X5 I, @  intersection?   ;; true if the patch is at the intersection of two roads: N$ B  s8 t$ D
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
& l8 K( B+ t* |& S# i$ O                  ;; false for a non-intersection patches.
# l# m: j& p# v( ^0 V. x5 ~) K  my-row          ;; the row of the intersection counting from the upper left corner of the' L8 \& Y6 p- Z" y  a8 l1 h/ @: O
                  ;; world.  -1 for non-intersection patches./ V# g! }% p4 Y: d9 o+ U9 K
  my-column       ;; the column of the intersection counting from the upper left corner of the
- z, T: V; ?; v+ F% s& T) v8 [                  ;; world.  -1 for non-intersection patches.6 z6 T  G' O+ j4 N) y/ v
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.! J) K* X, }0 j" Y
  auto?           ;; whether or not this intersection will switch automatically.7 M% {2 s7 R+ C+ h: M# d; T
                  ;; false for non-intersection patches.
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5 w3 e0 ?5 U1 e1 Q( j- H# E;;;;;;;;;;;;;;;;;;;;;;0 `. \1 S+ {% d% f
;; Setup Procedures ;;, a- g  V( Q! o7 I& z4 y, {
;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.
: j7 |' y4 `5 l+ u;; Create num-cars of turtles if there are enough road patches for one turtle to
& h0 k( g% q; j" Y% t% q;; be created per road patch. Set up the plots.
1 B6 t1 c/ c, c5 w' |# M5 x- pto setup
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  setup-globals
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  ;; First we ask the patches to draw themselves and set up a few variables
, y9 `5 i2 p& `' m. y4 f) H  setup-patches
3 f+ k6 K5 x+ P' I" R& A' z  make-current one-of intersections
3 |% ~. w- V- E! X$ S8 Q  label-current$ L8 b' f$ t$ d8 m( x
* G' T& a0 }, }7 z
  set-default-shape turtles "car"9 Z' b( o- [# X8 @

" h2 Z. f0 u; e4 T: s2 z! B4 U$ m  if (num-cars > count roads)- n3 l! e' P0 w! Q
  [4 g# }% w) e$ z- \3 G/ V
    user-message (word "There are too many cars for the amount of "& k+ Z4 ]0 @5 d6 z2 z# _/ _: N2 Y
                       "road.  Either increase the amount of roads "; ^& v( z+ S7 y3 a8 [! i
                       "by increasing the GRID-SIZE-X or "
4 u4 y! l4 D7 A! |2 B; z                       "GRID-SIZE-Y sliders, or decrease the "5 a6 F) ~% g2 u2 y- [
                       "number of cars by lowering the NUMBER slider.\n"9 h/ w5 i0 w- Z4 k; z' Z# p
                       "The setup has stopped.")
8 ]% u3 Y+ h/ V2 d    stop. F5 i7 B! O( N" f4 `
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  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color$ W4 w+ b1 k( A) \% V7 w: I% b( r, P1 O
  crt num-cars# f# n$ A# d% e$ {* K( U4 D; I
  [
6 K" V2 D% C, c    setup-cars7 {& `+ U6 s# [& Y# r" R+ }0 V
    set-car-color
; _+ c: t2 e0 H2 C7 g. L1 }    record-data
+ b1 j, _; K, X7 i' Q% M, ~  ]
, {/ }9 E9 W4 L
' w! v. c- [- ^. O3 Q/ ~  ;; give the turtles an initial speed
$ ]  l  {8 L- p# e# u  ask turtles [ set-car-speed ]
* Q9 V" m8 y1 N3 l% c  _; X9 Z3 g8 {* f5 a
  reset-ticks
! X4 O: h( C7 D4 T) Yend% P* k0 i5 Z. c% C  d9 ^

" S6 [! B" P7 K- [$ L$ O0 z8 B8 w;; Initialize the global variables to appropriate values
, ^& |; O& F' \& ?& Bto setup-globals' x3 o: ], h  U$ H3 j4 e+ p! M
  set current-light nobody ;; just for now, since there are no lights yet! g! y' b2 X% D# _" K: g
  set phase 0
  u, p. @5 L! H& o  set num-cars-stopped 01 _4 D% y  i* M& q+ i& s' t
  set grid-x-inc world-width / grid-size-x
9 C# Q4 p1 |6 k; Q# T, `2 ~7 M  set grid-y-inc world-height / grid-size-y
0 H; V: L; g" e' x% f* S/ p  l
0 \) ]1 O4 u; H; d9 M& A  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
5 k& Y# x4 K7 L7 l  set acceleration 0.099
/ p& I. I1 t0 X' c; Nend
3 a" `0 E  j8 k% G5 X
4 t8 X6 h' R1 L# P;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
. {! e- l& N! S* K# }* J+ L6 Q;; and initialize the traffic lights to one setting
1 M/ i  w/ |/ \& sto setup-patches
6 A) y9 P5 \3 J  r3 x  ;; initialize the patch-owned variables and color the patches to a base-color
% ?; y' U/ v" ~! J9 W0 [; G1 D  ask patches# y4 `+ D( F2 G/ S
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    set intersection? false
/ X0 D7 I; O* e) u, n5 H4 y1 i* v    set auto? false
5 y" h! w7 z7 e6 t6 b    set green-light-up? true
4 N; m% B. \7 Y    set my-row -1
+ x7 p( a. y/ ?3 Q1 T    set my-column -1% l6 f* H2 {3 g) v5 S' T& H
    set my-phase -14 z# U% }4 J* F, |# Y! w( \/ i
    set pcolor brown + 3  }, D8 Q6 j+ N3 V7 T( g
  ]# I1 M& p% X/ K$ u- F1 Z
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  ;; initialize the global variables that hold patch agentsets& t9 Z6 t* H9 b0 h
  set roads patches with7 {) ~: ^: N8 I7 b: Q* O
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
0 [9 @( L. |# E# `3 p3 ]    (floor((pycor + max-pycor) mod grid-y-inc) = 0)], i/ [. }8 y' a4 l
  set intersections roads with) j6 e6 o3 ]9 C$ M# L- \$ D
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and3 q1 s4 X; e& `: @) Y
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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  ask roads [ set pcolor white ]
$ g9 {. \. x+ k    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?3 a/ W+ B- S, g. J6 A
set roads patches with; n, m# n- \( i8 b
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or* Y' ^% L( @2 @0 J3 q1 G3 a8 J
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
: b: U! A: g4 ?. T4 w2 z. 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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