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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。
' G2 R  `  ~/ W& j) G' hnetlogo自带的social science--traffic grid这一例子当中,
9 B- }: N# m3 c2 J* M, Eglobals; f: j! e( |4 r2 e- V! ?9 p
[8 A* E! B; J; [5 x# c& L4 e- e5 n
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
: P* A) X! d) G2 m  grid-y-inc               ;; the amount of patches in between two roads in the y direction
+ C, F4 h! v; O  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
0 z: i. q! b! S; |% z* I; W9 n+ O                           ;; it is to accelerate or decelerate6 c2 L; i1 O2 _% L
  phase                    ;; keeps track of the phase4 z( G/ S2 {  [# n: r
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure  G, }$ e: X, A; m' s) a  |, A- ~2 E
  current-light            ;; the currently selected light) x( C' W1 k( o$ K& t% b! e
1 q% l7 B+ g  k6 [8 g8 d
  ;; patch agentsets; v4 M( G! w  M: E7 J' d/ f' V
  intersections ;; agentset containing the patches that are intersections7 E! f( R! T7 M0 n& B
  roads         ;; agentset containing the patches that are roads
& h1 N' Z8 U8 [) Z]
( Z: l* P( y2 l. z
3 M3 b. q4 T% qturtles-own4 ?/ n6 N0 P: x3 K5 m) z
[& n: c/ e2 _( Y. e* E! l3 l1 K
  speed     ;; the speed of the turtle" e9 O7 w4 c8 v: w1 z( U: O/ w
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
' B! P8 ?% n" N2 s' i  wait-time ;; the amount of time since the last time a turtle has moved8 a" G3 E' \7 Y
]: b3 L; ]0 q/ \6 r2 ^  p- j/ i
8 Z1 k$ t' G/ t
patches-own
6 B  r/ B8 W. X& J& j9 Q[$ Z* L, m/ U2 t' W' a
  intersection?   ;; true if the patch is at the intersection of two roads
5 x+ m6 K8 [' N8 k  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
' B7 l: w* O1 ~; l! v1 V                  ;; false for a non-intersection patches.
% p( W7 N% W" I, ^- p/ ~. H  my-row          ;; the row of the intersection counting from the upper left corner of the
4 \  {! N3 `1 q& h                  ;; world.  -1 for non-intersection patches.0 K% l0 l) b2 _% q% ]9 f2 {; C7 k
  my-column       ;; the column of the intersection counting from the upper left corner of the& ~. g5 t. L7 |% |) f5 M
                  ;; world.  -1 for non-intersection patches.
0 `+ d: z7 T5 W  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.- \8 B; h. v( x7 [7 \8 N
  auto?           ;; whether or not this intersection will switch automatically.
3 @$ A" Z% E2 y6 P' r+ y+ V" h                  ;; false for non-intersection patches.
* I9 O" N% B( A  N]
- Z5 r* t. P% x3 g) S* H
& i8 \: Y* q/ t, `
9 n& s8 Q  n2 {# S, T2 Z) Z+ _;;;;;;;;;;;;;;;;;;;;;;! b7 s- z& R- y# @( z, c0 O
;; Setup Procedures ;;
! Y9 \6 F' r6 Q( g: H+ t/ y;;;;;;;;;;;;;;;;;;;;;;
8 C8 n, n. @) c- J9 b( `6 t
9 A1 v5 C- q1 e8 I" C;; Initialize the display by giving the global and patch variables initial values.& r% f, ^% z5 x1 v2 K! O. U% s
;; Create num-cars of turtles if there are enough road patches for one turtle to0 a& O% T' B1 M# w- C* |
;; be created per road patch. Set up the plots.; G+ s( W6 S# _7 j# E  m
to setup  d, Y  v5 k/ \: m4 B9 |
  ca
8 ]! p8 i, R# Z# J% L* B7 V  setup-globals
: F8 n* i4 i, t, c) g0 T# s3 t9 u' [1 K1 I# N  E" F1 y/ F" Y/ |' z$ T; Z: O0 v
  ;; First we ask the patches to draw themselves and set up a few variables5 f# u* ]! _; c
  setup-patches
2 r8 ^. `8 z6 |! k( A! x7 ~. g0 I  make-current one-of intersections" k5 g0 \, w0 D/ x; P
  label-current1 c3 `# M2 b& B4 S: g8 E
- G6 }9 F* Q; y+ {! v: A  R4 t
  set-default-shape turtles "car"
6 f1 e' }5 i* i' X* A: w) o' o* _- N: Z, W) }2 @
  if (num-cars > count roads)# O) [2 x- A  Q# S6 Q
  [
9 f7 j8 h6 P% x, D7 w. Q    user-message (word "There are too many cars for the amount of "& ?$ b- x/ Q: d; I
                       "road.  Either increase the amount of roads "
4 \; U6 d2 F9 g: P                       "by increasing the GRID-SIZE-X or "
0 |9 U" X, m& R                       "GRID-SIZE-Y sliders, or decrease the "
' e, p, E" k5 o& w. q) |' W2 i' l  Y                       "number of cars by lowering the NUMBER slider.\n"
* K, l# Z' \/ i/ C                       "The setup has stopped.")
9 o9 Y% z' v( d7 O( V3 H5 y    stop! i% K1 I! |; n4 j
  ]( {" k: o# l8 a4 P
, c- l) h6 f4 U
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color+ O) v: }' i+ s! M" r5 V7 [
  crt num-cars
6 F" c1 b9 o) f% O' a  [
/ _2 R* ?4 R( ]% Q4 e3 x    setup-cars& g* @/ @6 Q5 I5 f2 N: \# S
    set-car-color- L" n+ u1 r8 b) f
    record-data$ C( ?9 k, ~* f$ ]) h: y4 t
  ]3 o2 _5 f' U& M9 B" B

( Y3 l/ H/ ]6 i, Q$ E+ s% o. @+ w  ;; give the turtles an initial speed
, p( y( C2 O) n  ask turtles [ set-car-speed ]
) Q1 `4 Y. \( R/ z2 v3 f6 n  u$ U4 a+ X2 M; B# m$ B
  reset-ticks
% b' h7 @) z6 nend
4 l2 Q' |$ ]; C; ?- r4 V' n$ P1 {
) K; H# G$ i9 p1 t% e, a8 Z;; Initialize the global variables to appropriate values1 v+ \' t4 O, v6 c
to setup-globals7 R- |4 y6 x) q1 @) a& {
  set current-light nobody ;; just for now, since there are no lights yet
( s, j3 p) R( a! X  set phase 09 G6 `4 J2 W. k6 @$ _9 x4 K  @2 Q
  set num-cars-stopped 0
$ z4 z, N3 E3 A$ Y  set grid-x-inc world-width / grid-size-x
, c4 R3 A2 ~9 P. L  set grid-y-inc world-height / grid-size-y, f: ~# O, K  x1 |5 T1 A& \
) x2 u, Y- h$ ]) x1 U
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
; O+ e7 l  [  {  set acceleration 0.099
7 o% r( [+ s; n; G0 ~/ Wend
4 O0 ?' L$ z9 e. x# B4 X& W2 @( F' U7 ^
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,$ I6 k2 Y) i" O9 S# G* D3 j! K% L
;; and initialize the traffic lights to one setting. ]% f* B- `! Y6 G
to setup-patches! y4 r: h; N7 ^, q$ i! H% c
  ;; initialize the patch-owned variables and color the patches to a base-color4 R( j. n- ?% Q; B' a$ S, G
  ask patches: O  r; c% S7 u
  [
- Z* M- P, a2 d2 }, \) S    set intersection? false
8 O& o6 k6 \, Y8 O    set auto? false) g2 Q8 F5 |" P& A( D" M, n1 X. M
    set green-light-up? true: c4 ^9 q5 {% W$ D5 c8 o! S; ~
    set my-row -1
( |# A& p; h3 i/ }7 _    set my-column -13 C! x' f+ n1 T. B: E+ B
    set my-phase -19 \% |, e7 y# W" `; s1 q& O  I
    set pcolor brown + 31 a1 @( ]1 u; E2 O
  ]
2 `2 u6 r; z; ]/ N6 f4 y+ {: d, \1 e- ^
  ;; initialize the global variables that hold patch agentsets, I  p* P7 B# {6 l% F8 m# N  H) ]
  set roads patches with2 M. l" [* F" i3 q7 Z
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
: r$ G$ x3 Q1 ]: e/ U9 n0 S& w- l    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]3 B% P5 {1 a, T) A$ U
  set intersections roads with: U6 X; F: U( W$ t& ^
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
' [  o* q3 C# w* l; Y    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]/ Z* G% g" O# \% d
4 Z$ N/ v% i1 c9 w$ _
  ask roads [ set pcolor white ]
# _! `1 |. L5 O; q7 r    setup-intersections
( {! [4 s' r* C: S8 `+ U3 y' vend
+ j  K# a& z; U+ }其中定义道路的句子,如下所示,是什么意思啊?# n1 w( y( T( L! k
set roads patches with8 Q) c  {) R( `4 D2 ~
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or) M* ?# K! }+ W0 }' p7 g% D
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]- }4 [( O7 }6 k$ ~# @8 t
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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