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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。
/ T$ B0 b# Y9 S9 Wnetlogo自带的social science--traffic grid这一例子当中,$ Y3 Z: X* T, _& N
globals
" B( Z0 L4 ^2 a1 G9 S3 v6 L0 K[
: l, e4 `* n6 G+ K7 I7 N6 q  grid-x-inc               ;; the amount of patches in between two roads in the x direction
+ G  w  U; S! A- m: w1 I- {  grid-y-inc               ;; the amount of patches in between two roads in the y direction* V. ?# r" D" ^0 c/ I2 p8 V  o
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if  O3 E1 I/ ~# a3 i2 e7 x
                           ;; it is to accelerate or decelerate
0 [, F: k4 |5 z/ M# d2 H' P  phase                    ;; keeps track of the phase
! _. k+ H1 V$ Y0 z' ]  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
( _0 H2 m, z: c) J* B  current-light            ;; the currently selected light
. ?+ p& N0 |0 |5 Y' g5 q7 c
4 f! v& M3 S5 L  ;; patch agentsets& h" v' L+ V) Q/ g6 j( i2 y
  intersections ;; agentset containing the patches that are intersections0 }6 K! C. r' X3 h" Z. X
  roads         ;; agentset containing the patches that are roads
' L) R. k/ T8 _) C  x0 G+ z/ w]4 h5 G4 M$ C! J( Y2 K; Z7 L

/ s4 x2 P  ^1 k4 Q$ [! Y" q/ kturtles-own
5 e, }" _  a3 a; w  `$ B$ e[8 ]  n( b  u1 N6 @$ `. b0 x7 o) r
  speed     ;; the speed of the turtle
9 s  i* O$ i1 L& J4 j1 g  up-car?   ;; true if the turtle moves downwards and false if it moves to the right( K. s" ~0 h& G" a$ d
  wait-time ;; the amount of time since the last time a turtle has moved
- W* K# @4 ?/ T3 H; J5 f+ i]: ^4 G" a' ^" i- q" a* L; Q
3 M: L7 R" P- V9 u' q& K
patches-own* z. ~0 k& `* T' R, K; ^) Q( l7 [- ^; }
[8 r9 t$ v. e) U* Y" I3 z8 k( S
  intersection?   ;; true if the patch is at the intersection of two roads3 x. e6 _0 e' F7 \) C
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
2 R# X" h* J' N0 g$ q9 C                  ;; false for a non-intersection patches.
/ x- U) C* a& @! K4 I" a# l& {  my-row          ;; the row of the intersection counting from the upper left corner of the/ V" y, N! @# r' K; C3 Y
                  ;; world.  -1 for non-intersection patches.4 ]6 p. S3 S" \' p% D( ~
  my-column       ;; the column of the intersection counting from the upper left corner of the
) L! X2 A  ^( s: }4 R# E2 u                  ;; world.  -1 for non-intersection patches.
6 G- i; j4 \4 M6 u) E6 |  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.) [  t) g4 y& t; K" n( L) t
  auto?           ;; whether or not this intersection will switch automatically.
; M- e6 p0 a4 C4 ?+ Q                  ;; false for non-intersection patches.
5 F0 v" n* W' j( c1 K]; G# m/ }4 s- Z! u1 f; f' f! u
$ t  X$ r0 W+ D

& o, t8 B' O( P! u, i;;;;;;;;;;;;;;;;;;;;;;
9 C: j% s' B: _5 @) |# p! e0 T! g;; Setup Procedures ;;6 J- M+ c0 v# {* @+ [
;;;;;;;;;;;;;;;;;;;;;;, F0 m) A/ M/ a1 k# Z9 g

+ [. x- a: s5 c9 q;; Initialize the display by giving the global and patch variables initial values.
. K( E" o* i2 K8 x1 K;; Create num-cars of turtles if there are enough road patches for one turtle to
3 U; L8 S( ]( z- q9 f;; be created per road patch. Set up the plots., R4 v: p& g3 _+ T
to setup
& `4 m9 E' h0 W' q+ G3 i6 f  ca/ \; @# g! ]' c' l
  setup-globals
+ n) |6 r# u2 D% H( v" `
7 e% w; p# {( V+ {  ;; First we ask the patches to draw themselves and set up a few variables# b8 U8 \4 F3 o% V* ?) v  f7 c
  setup-patches3 ^( X/ W! t. E& N7 j  t: N  s8 H8 N) p
  make-current one-of intersections3 `! w4 b9 s) S  b' u
  label-current
4 j& _' |* E3 \% A. k
% @  ~% D& v2 k6 G9 o  set-default-shape turtles "car"
* J  T& \0 f0 f; J4 ]# H: I* n- I
  if (num-cars > count roads)9 X3 o( |: D4 b5 h* F0 b
  [
, [5 Q( J5 B* l5 Q; I& w9 Z    user-message (word "There are too many cars for the amount of "" ]- K; s( _0 O! |1 Z: g
                       "road.  Either increase the amount of roads "$ N  z* w- }0 b( S' R3 N0 [
                       "by increasing the GRID-SIZE-X or "  E0 p3 A+ ?1 u) _9 E
                       "GRID-SIZE-Y sliders, or decrease the "' N! y2 s# P- ?8 O: y
                       "number of cars by lowering the NUMBER slider.\n"+ d! U: V; [( c: N2 |
                       "The setup has stopped.")2 Z* \4 P. J, K7 C# v
    stop% H7 \7 v9 y) _1 Z3 |" H4 k2 C" `
  ]
3 x9 ]- _+ X& K$ d" p+ ]( y( Y6 m+ R+ x" M, ^9 F' ?
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
3 m/ x, u8 l+ J) l5 w. \$ t  crt num-cars7 `) i9 I# Z8 X# J: x
  [. Q3 D0 j: }2 b! H( ^% V+ W
    setup-cars
5 q/ I" e! ^( z4 x# j+ S, q  V# h0 o    set-car-color) D7 l9 i* G) y; z+ [
    record-data
/ b2 K# k+ r7 e- [1 _  ]
# ]/ f8 \6 n" L- ]5 X8 L: c" _  E, `! T3 f$ c! o+ }* n
  ;; give the turtles an initial speed
: G8 \$ _; E$ g4 s& ~5 Y  ask turtles [ set-car-speed ]$ e6 k% K" m) d8 B. v. o7 W6 W9 D
5 X6 x) y1 M/ p( ^- J2 L8 A/ J
  reset-ticks
: _6 m- N" V+ z- ]. _/ L" R6 yend
4 Y7 K9 V; r/ Y) @1 O7 x- S& }2 [! {+ S2 S. z+ u/ R4 b
;; Initialize the global variables to appropriate values4 V0 u2 c5 P$ n- N. B
to setup-globals+ c" L1 G) }& y; [* d8 p# S
  set current-light nobody ;; just for now, since there are no lights yet
* F2 L1 L$ x. A# S: G* ~5 o% H  set phase 0/ \5 Y0 n$ Y  [
  set num-cars-stopped 0( a, \3 N' P$ F1 \
  set grid-x-inc world-width / grid-size-x9 I# _- g, |5 g0 {4 f% a  O: V
  set grid-y-inc world-height / grid-size-y' B0 d0 H6 |0 A$ V1 }
8 |7 q1 U4 h- d4 d  O. _
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
: a  t# @. \. ^, @  set acceleration 0.099
* g# d5 e$ A$ Lend
9 J& U: Z2 n; K: J. I7 V1 B0 q
" w$ F& s8 v! X6 D' s/ G+ l& Y;; Make the patches have appropriate colors, set up the roads and intersections agentsets,0 T( O& y- D- P5 d$ r- P
;; and initialize the traffic lights to one setting
7 _+ i  M3 }) ~2 Zto setup-patches
4 w( F8 X3 ]. K! l9 m/ c% z: O  ;; initialize the patch-owned variables and color the patches to a base-color
: k5 G2 |- l  s4 D9 C, P  ask patches& F( y3 ?- {9 d5 m
  [" D: S5 I+ z7 J: S% k! }; ~
    set intersection? false
1 n: K$ }: W9 ?7 ]8 k3 F0 @# g    set auto? false; }' y+ N& a0 Q' G& i
    set green-light-up? true
* }4 h1 ?! x: c    set my-row -1  Y% ?# |/ N) Z! Q
    set my-column -1. _8 y4 d1 `. b& t. q
    set my-phase -1
, ?2 Y/ O4 C! x    set pcolor brown + 3, {' `2 Y) [0 [( G6 u
  ]+ A5 v# j$ k" p: \3 y+ }/ T. n

5 S5 D3 e* f& w. F8 d; e  ;; initialize the global variables that hold patch agentsets4 P$ v0 o' q+ s6 b6 t* u
  set roads patches with
+ q0 U4 D- h& i6 o+ H    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
$ C" a  Y; _, z% v* s* q    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
- \6 [* ^+ o8 d4 j. j( r- n- J  set intersections roads with  E5 a$ Z# Y6 f8 r
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and# X9 s# n1 e. w$ K7 [
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]2 R/ T+ ?. v% T
( P* k1 W* v  Q
  ask roads [ set pcolor white ]# ^, G# n" c  q( u% A5 k
    setup-intersections
& p' z- L& z- V2 i, \% f7 wend+ ^. F$ u/ L# Q" I. H7 N# \! d
其中定义道路的句子,如下所示,是什么意思啊?
% z* ^( T& g+ L. W" M set roads patches with. C$ }. \; y% u# u/ w
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or2 N" m( L+ Y1 d$ n4 b
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
8 g& A; V) K+ p$ Z- u3 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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