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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。
1 p; E7 y. V6 v/ T. Knetlogo自带的social science--traffic grid这一例子当中,
; u' D+ u3 }; }4 Sglobals
3 F" k( r) r7 Q/ W[
2 S7 r5 x4 v% c  E' H6 V& w6 n  grid-x-inc               ;; the amount of patches in between two roads in the x direction
/ H0 S9 G) ]9 |- J; L  grid-y-inc               ;; the amount of patches in between two roads in the y direction& Z' |" J" G. g! K( A0 |1 B
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
; q+ ?! ?$ k0 j" z                           ;; it is to accelerate or decelerate" _0 F' Q+ w! {
  phase                    ;; keeps track of the phase
- O4 Q+ O0 S* K# T" i, T  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure! b( b/ u+ g! f7 c+ ~
  current-light            ;; the currently selected light
4 i* i! u  g$ M" Z) B1 S+ h/ q% P2 t5 y5 S
  ;; patch agentsets
! s, F$ g: ]+ |  intersections ;; agentset containing the patches that are intersections' z* A0 _9 [2 o, G. L5 F
  roads         ;; agentset containing the patches that are roads. g1 y; Q2 b. n: D
]
* [( B$ W$ l8 n: ^* j" G5 ]0 v. l: d& J' z9 A# f" T
turtles-own
7 _$ W; R' b1 h0 s) N6 [0 A8 ]% ~[/ [9 h* {! F2 T6 N
  speed     ;; the speed of the turtle, u' D/ R8 W, z8 ~! O  h2 i
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right/ a/ \2 X* Q* Y9 \" ?& {5 S0 `; h
  wait-time ;; the amount of time since the last time a turtle has moved. x; Q! y7 Y5 w$ |3 X/ A, K7 r# S
]1 u; w6 G6 b; h- Q

# U0 T2 a. _7 E2 b6 \+ @patches-own
: s1 I; n, U% d[& ^; I6 ?9 m1 w2 q' O" f. O5 n
  intersection?   ;; true if the patch is at the intersection of two roads
# F& `0 Q/ F/ R! O, ^  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.5 v9 ~& S, y# n* u( b" j# I* p
                  ;; false for a non-intersection patches.3 D1 D; i3 A1 p; v6 j2 V, A) ?
  my-row          ;; the row of the intersection counting from the upper left corner of the
  R3 j0 m7 k. x) S0 g) F                  ;; world.  -1 for non-intersection patches.
) l  o( ?' o9 h  A: H8 U1 G  my-column       ;; the column of the intersection counting from the upper left corner of the% j& n' B& D5 y
                  ;; world.  -1 for non-intersection patches., x7 X2 y+ m# u2 y' H
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
. \$ F$ x/ R) t" E( E5 u  auto?           ;; whether or not this intersection will switch automatically.# W- ~$ ~& K5 b, i$ H9 J
                  ;; false for non-intersection patches.
8 ?" a' I& E3 }]0 {; P. u( ]- s% d  m

2 B: l. s# ]3 ~4 t, n
3 {9 s  ~/ Z. M5 l! H% F' U, N8 l;;;;;;;;;;;;;;;;;;;;;;; H" a3 a( j8 F3 z5 v7 @- G& V
;; Setup Procedures ;;
; L! t5 R$ j( Y" c8 _;;;;;;;;;;;;;;;;;;;;;;1 M0 Z: M3 G) h2 t" T, O% z

; V, d7 g! L' p& m4 p( ];; Initialize the display by giving the global and patch variables initial values.
, i; s& U6 c. a' k/ g1 V. ?;; Create num-cars of turtles if there are enough road patches for one turtle to
  R' S. A- h( B! q$ n! z' ~;; be created per road patch. Set up the plots.8 U; o' f& s# L9 n# `' A: w3 |
to setup
: D- K! U- @: A. B  f$ E5 F  ca
. a# y- v1 i% R- R' P& H; w5 R1 L  setup-globals: B1 X) R) G3 ?( [
, A, d  [. Z2 X, p; {% t( H
  ;; First we ask the patches to draw themselves and set up a few variables
" v' U( K7 R2 {  setup-patches$ A- s( o7 [8 `. a
  make-current one-of intersections' O( {5 M. i# n( k0 c' q: n+ ^+ k6 n
  label-current
0 G1 w: \' L6 E3 @/ J3 I( G4 Z7 `+ A! N
  set-default-shape turtles "car"
: n% M! J) b' L0 |- ]+ M& f% _+ _) H" U
  if (num-cars > count roads)
7 W2 S6 C* S# D  ]: N9 ~7 _4 j  k  [7 `* r, o+ P0 }
    user-message (word "There are too many cars for the amount of "# {$ C! M7 a: h' r( U# f
                       "road.  Either increase the amount of roads "
7 X2 b7 t( b0 X0 D8 ^! T% V                       "by increasing the GRID-SIZE-X or "! g. |) G" x1 F: {/ q; n
                       "GRID-SIZE-Y sliders, or decrease the "
, t  S+ e: |) R+ ]% v                       "number of cars by lowering the NUMBER slider.\n"
" A, H5 v9 S+ ]5 `  x; Y+ d6 T, ~* `                       "The setup has stopped.")
3 ]" g' V' p2 e" i8 y$ u6 f    stop
3 [, Y( z, D# n% J! |" C( G  ]
" m7 {! O5 Q$ L
: E! b2 }& Y" x! [7 Q1 {  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color/ ?. m# P: M; p  g( F
  crt num-cars  g; G' J. r6 C2 e
  [3 r/ x6 i' h6 d$ O
    setup-cars
( r' x& f( u7 t# A7 I    set-car-color. H6 [+ \* a: j) ^% u
    record-data
" Z/ x" k- E* x" p9 n/ X  ]5 _; A- z' H1 \4 S2 Y; h8 W

1 {& H$ X9 X( Q9 _  ;; give the turtles an initial speed
2 l! L3 {  h6 I2 k/ X  ask turtles [ set-car-speed ]
' u* C' `) u( _9 }% Q$ C4 D- j( V: K+ E& ^
  reset-ticks/ c4 N0 P  r  n$ R
end
0 S" A; I2 b% N$ I% k$ F; Y- d( \8 E" `6 c' ?5 e
;; Initialize the global variables to appropriate values& E( H- _* T# z
to setup-globals# p2 M2 K4 W1 i0 E& }- h
  set current-light nobody ;; just for now, since there are no lights yet
) R( i# r5 c7 V* ^# D& N  set phase 0
7 ^$ s% \. q( W& ^4 u  set num-cars-stopped 0
( w0 P. C! J# d) u" F, f  set grid-x-inc world-width / grid-size-x* D$ a/ V! }( Q1 a- B$ d3 J! R
  set grid-y-inc world-height / grid-size-y
9 s5 s$ M7 D: F9 o: u! u3 M* `
, D: A+ j( v# O# U2 I$ g9 A  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
, \$ w+ `2 i5 Z! Y( g  set acceleration 0.099
1 w9 o3 Y4 r; V6 e7 bend  T" g9 b/ q" F7 x

, E) q' k0 ]2 h" J8 q  i  \% l;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
2 J$ }2 @  |  G) ~% B) @: u;; and initialize the traffic lights to one setting+ c. J  f) a+ t' `2 j
to setup-patches! ^2 ]1 }0 D( d3 E
  ;; initialize the patch-owned variables and color the patches to a base-color, l. O" x$ R- V9 u7 u' T# h4 G# y& t0 |
  ask patches( {6 D+ s6 W: s! N) c7 m
  [
: P) O, _; [$ x    set intersection? false, A! H# [9 \0 s5 L  `0 o; p
    set auto? false, i( s& N. j2 x1 I) a  b
    set green-light-up? true
, ^* v3 Z4 F( o: [3 _! H" ~    set my-row -1. I) e  z4 v9 M1 Z2 Y) l
    set my-column -13 k0 v1 P; L  r9 y0 }" l
    set my-phase -1
; p$ u# [7 P2 Q; j  i    set pcolor brown + 37 y$ ]# F3 P4 }* ^9 d* w
  ]
3 W. L5 A) i' f. B0 @# s
  {4 \( L2 p( s) {  ;; initialize the global variables that hold patch agentsets
; b% e7 F7 g! {; ?0 D; _  set roads patches with! E! a/ w) L5 h' b2 N# }: t
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
! N/ X2 ]4 b6 F9 o4 n    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]  ]' M" g8 C  T" |- k
  set intersections roads with5 A8 p  V' Q$ ]; s* B9 o+ f
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and  ~, F; D9 ?% i& c2 G5 t
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]' ]5 H1 \- Y2 I

2 j7 x7 l3 v3 K: e. ^7 c' V, F  ask roads [ set pcolor white ]& v0 R0 T. W+ f' u- a! \& N8 ^" n" e# k
    setup-intersections* p; ]) U/ ^. N" h
end
3 \4 n: S  }/ G其中定义道路的句子,如下所示,是什么意思啊?
: i- V5 J* E, _$ f; z% r" ^1 K5 V2 j) G set roads patches with9 V, D' m  x9 D) P( t/ \
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or1 \" B" B7 @' E: }% `
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]$ H6 e) d1 j( X. 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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