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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。/ [  G4 I& d; ~! W3 F
netlogo自带的social science--traffic grid这一例子当中,$ U: f# Z: X, f# j- O# k  b
globals  d% w" V5 x, k9 X* p& H
[* Y" t+ v0 A9 C+ c! \
  grid-x-inc               ;; the amount of patches in between two roads in the x direction9 h' c; @! y! X& V# Z7 k7 D; x  S
  grid-y-inc               ;; the amount of patches in between two roads in the y direction- Q3 j5 l- W6 ~
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
3 S4 H& R: P* {( {                           ;; it is to accelerate or decelerate$ ]& P$ x+ I! [# d2 F% A0 S6 M7 ?* o: \
  phase                    ;; keeps track of the phase
: @; g" p  w5 R' ?, H- ~; W  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure3 w) m5 X* P" v
  current-light            ;; the currently selected light% b. ^! J* F' l0 E3 _6 B, f1 \
5 L3 Q) y: E6 R  g' p
  ;; patch agentsets1 ^. m( t! T" P( S; _2 ^
  intersections ;; agentset containing the patches that are intersections0 j- n0 U  Z- o& b5 Y# f
  roads         ;; agentset containing the patches that are roads3 C( r# S; S  z, H( D1 u6 h4 F
]9 O# [% w; N( c% x8 E4 Z4 T$ ]  _
: M( D" k, x, g8 u/ U( ^; W! r
turtles-own0 h: e; N: \$ r4 [: l* N- p4 Q/ \
[. S5 F) A' B6 P1 ~+ z  e3 z1 i1 c
  speed     ;; the speed of the turtle
! j! J6 V* L5 d: [5 R  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
$ Y; ]6 [. i. k0 {' m( I* ^! I# f& A  wait-time ;; the amount of time since the last time a turtle has moved9 w4 @8 Z3 P, x5 \
]
8 X5 J% @# q4 g" a9 O" D4 ^8 i! \! J+ j: E5 z, g; g. r
patches-own
5 l& G9 W4 R& o! i6 n3 ][9 Y, B3 J' [' ^, N, F. g
  intersection?   ;; true if the patch is at the intersection of two roads
( @' O5 k7 o. U! t# b0 U  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
4 h7 F. o! x- g( b2 L8 x6 G                  ;; false for a non-intersection patches.4 L" r3 g- W0 g1 ^' B: H
  my-row          ;; the row of the intersection counting from the upper left corner of the8 ~/ G6 @3 J* V; l& p8 Y1 S5 m& z
                  ;; world.  -1 for non-intersection patches.
4 S8 F& i- w: H- G! I4 Z  my-column       ;; the column of the intersection counting from the upper left corner of the( g$ e, T- g- f0 B8 R
                  ;; world.  -1 for non-intersection patches.3 w' o! o3 n2 `; I
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
) f  s) J% k+ [) I  auto?           ;; whether or not this intersection will switch automatically.
' |- v9 p& I/ y, m3 e' i, m                  ;; false for non-intersection patches.
9 T; j0 ?, J, X' y# h]
3 _3 Y; C4 i+ j) n& o3 Y5 k- h
* C" r# Z1 q. }7 w
4 D% N9 I5 P1 Q+ o3 \5 l;;;;;;;;;;;;;;;;;;;;;;. G% Y* v' p4 m
;; Setup Procedures ;;
9 F4 f9 I1 M3 S6 f  o* ^) Z;;;;;;;;;;;;;;;;;;;;;;
' d- m& @+ I5 t7 M* i4 {& g7 w7 ~2 S3 g4 [
;; Initialize the display by giving the global and patch variables initial values.
1 I# P' {& u, G2 a4 A( i;; Create num-cars of turtles if there are enough road patches for one turtle to
& B0 A/ Y- Z0 E- d# j;; be created per road patch. Set up the plots.
0 R/ z! m, D* w+ a* J' U2 |9 }' q8 F) Mto setup
- K9 f' G7 I  Z3 t, n, p. u  ca: g6 P/ r# T' o9 A! [2 t
  setup-globals; D) u$ @1 A, J$ p1 j% V% b

( I" \( b: l5 K- z: G2 {  ;; First we ask the patches to draw themselves and set up a few variables3 B  ], U. g. S1 P* a7 n: w7 }/ Q
  setup-patches1 K2 w1 c" f/ @, V4 u3 Q# @
  make-current one-of intersections
  ~9 u( I0 P, o9 Q/ d9 w  label-current7 b5 |# e0 G4 s6 o6 s- p. ?
5 R$ o/ H% |. U) a0 ^
  set-default-shape turtles "car". Q! o# N4 J( X, w$ ^( O1 s8 p
% H4 H$ o* q; g# ?' R- u% L0 M
  if (num-cars > count roads)0 a, W! Y! D; p$ x3 T
  [
2 w( p9 R3 f$ A1 V' m* y! V    user-message (word "There are too many cars for the amount of "1 D1 L4 f5 X4 _
                       "road.  Either increase the amount of roads "
: b% F6 m* v5 w0 Y                       "by increasing the GRID-SIZE-X or "8 ^5 ~" z# v1 H) Q
                       "GRID-SIZE-Y sliders, or decrease the "
7 X4 R, U* y0 v: n- _) @, i                       "number of cars by lowering the NUMBER slider.\n"
! c9 z5 p) k- J  R6 }# Z; f6 b$ X                       "The setup has stopped.")
; b7 g* e; S9 G1 @) S* w    stop5 y$ D2 v& ]1 f+ u' L
  ]* o7 t' O1 `% ~" {- q- U" ^5 g% W5 @

# l& S. n* J3 S: s  ]/ @$ y  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
8 D4 s; ]; W" y) d4 a- Y! W  crt num-cars
: r5 l7 t/ s; v! W: |  [
9 W" y$ C2 G: @% F    setup-cars
8 c5 [: k3 R: z% A  F    set-car-color# P4 X# m# I. S/ A* p& t0 F1 ^& O; }7 `
    record-data
. ~. V7 F2 \: T; R& Q  ]
, A. p# Y: C2 n: l! \  w, V
7 n% x0 ?! R# A3 a, n9 W  ;; give the turtles an initial speed
3 V. f! M) l1 K3 y* Y  ask turtles [ set-car-speed ]
! {5 U6 V% L3 ^$ L4 I
. y& v2 L" r0 l  b9 O5 f% G  reset-ticks
5 `7 Z5 U! }+ b0 s& x0 q# r. Wend2 G: p  I) ^/ I0 t/ ^
; t8 Z6 m( m+ S* f
;; Initialize the global variables to appropriate values3 ^& U3 S$ Q) j6 b2 f
to setup-globals+ Q2 J- z) b: r  t5 z2 _( g
  set current-light nobody ;; just for now, since there are no lights yet; l# D$ I/ f: z$ X! ~3 }
  set phase 0
% I" E: x! o; a& ^& H  set num-cars-stopped 04 L( {% Q. f9 r. ~) J
  set grid-x-inc world-width / grid-size-x  G) S- a0 J7 e( p  b+ n3 Y4 F9 U
  set grid-y-inc world-height / grid-size-y8 a# M2 Q2 O7 \; ?8 g1 f( l
( I+ b" G: c& j5 C, J4 W
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary" f+ l" P8 `% S* A% c' `
  set acceleration 0.0999 W2 O* H, _" L5 ~& Z0 A
end. p# ]/ R6 K/ N) |6 n

- u) v+ Q  I  G;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
. K3 I+ J" u- q;; and initialize the traffic lights to one setting& y" L0 {# ?+ y* [; m
to setup-patches
# p6 m% ?8 A- u. L5 g# x  ;; initialize the patch-owned variables and color the patches to a base-color  c' V0 i9 g+ b6 G) p9 E) J
  ask patches, x# h, ~6 B. X; O7 h1 T
  [
6 s& g+ q' A; m4 `5 ~    set intersection? false/ b, S3 [9 K- L" n; b3 g
    set auto? false5 F$ u4 h4 |# _7 {+ p% c
    set green-light-up? true! K) m+ A: [6 I% p0 n2 l" m! g0 A* E
    set my-row -1
& a  `' f  l+ j4 t; P    set my-column -12 ^; x0 z9 N/ ^; v6 L: E) v8 [
    set my-phase -1- D$ b- \* \0 x" D" ~" F7 I
    set pcolor brown + 3
/ C$ q$ \# d+ [! B( W& `' {* p  ], q8 k: H. ~, P/ `% Q) W

* h# Z$ V. P8 u$ G  ;; initialize the global variables that hold patch agentsets1 P( r6 ^% S& ~
  set roads patches with! p& u% x' j2 U; a
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or7 B9 a$ Y* w5 ?4 k
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
. T, P- ]! H$ \+ s  set intersections roads with3 \& Q* l. M& q# _
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
0 q# n9 X7 c, W9 n    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
0 E" A/ h9 @9 |
5 K( E/ h1 ]4 m9 I+ t9 f+ o  ask roads [ set pcolor white ]3 f7 N# D: e* q+ _+ [
    setup-intersections
2 [2 ^/ _' q* K. n/ W# @$ Pend
, c, q9 R6 B2 ]# L$ ]! b# @其中定义道路的句子,如下所示,是什么意思啊?
: w( ?7 s+ p( k, E set roads patches with, K6 l5 T& ^/ d; E
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or" {0 w) R8 o0 \4 `, M' w5 ~
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
: I/ r, I0 A: w$ @! Y3 h- 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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