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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。
8 e- `* V; V2 t& ]' _: Y  C& X6 p/ bnetlogo自带的social science--traffic grid这一例子当中,
8 [$ H: y3 L/ H  D' d- wglobals' i( ~& e+ a9 a; E2 l, A
[3 z1 V- [9 B0 |6 R: c3 E
  grid-x-inc               ;; the amount of patches in between two roads in the x direction' `* `+ ]& [3 K& c. L, N8 g
  grid-y-inc               ;; the amount of patches in between two roads in the y direction5 j; o. i4 f! E3 A% U4 n
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
9 V. d! j, ^8 C# y  ]$ k                           ;; it is to accelerate or decelerate
. r# \& i' ~$ n" ^+ _, V  ]5 k  phase                    ;; keeps track of the phase; Q0 X5 v7 Y  a1 [) [
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
* E1 D8 J; |4 _* ]  current-light            ;; the currently selected light
2 |9 y9 [" Y3 x. D; s- r% Y9 a  _  ~$ W4 m8 t0 @' c% E
  ;; patch agentsets2 T# V+ N0 R# o8 u8 c
  intersections ;; agentset containing the patches that are intersections# i4 U+ P5 s- A) Q* \
  roads         ;; agentset containing the patches that are roads
$ f9 Q+ W5 y! |( F]; h/ d$ \$ m9 ?9 Q  \' @

/ e" s! V8 Z/ b. M3 y1 Gturtles-own* `  V& @, s/ H/ z: k  \
[
/ n; {  C- ~  t* G; F8 I" i0 i  speed     ;; the speed of the turtle+ e4 Q: b. [* @# {4 I
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
- t* i+ L! \2 g2 s$ q% h  wait-time ;; the amount of time since the last time a turtle has moved, N( S' D7 s6 U2 a
]' F- @3 k8 d4 \9 Y

3 P- S) {# U: o  s6 R( k" s9 V* dpatches-own
9 I4 }& t. Q2 B! ~[
6 k+ f/ ^% s, `$ M4 T% ]  intersection?   ;; true if the patch is at the intersection of two roads
; S- b# t6 z. s& U. ]% {  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
- v  W) g/ o6 h                  ;; false for a non-intersection patches.' o" r4 P( N; w/ f
  my-row          ;; the row of the intersection counting from the upper left corner of the
/ I' c8 |1 p& R5 d- ?7 g                  ;; world.  -1 for non-intersection patches.
- \& a/ K* f- |8 p  my-column       ;; the column of the intersection counting from the upper left corner of the
, R# S+ a8 O( r* ]" F( B: ^! c                  ;; world.  -1 for non-intersection patches.: _9 y- R! n' m
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.7 c1 C) N0 ?1 q7 w0 S5 ^
  auto?           ;; whether or not this intersection will switch automatically.1 M, {1 F3 _% B: r" S$ ]% N
                  ;; false for non-intersection patches.) C7 b: Y+ f7 \7 i( [" q/ b
]+ r, E9 B5 d0 g! q+ [, d8 }4 k/ R
+ b: t  j2 L2 ?; Y* ~

% z1 C9 O9 C8 F8 @; w' Q* f, ^;;;;;;;;;;;;;;;;;;;;;;
# c% n; e! ^$ B% h1 ]5 h;; Setup Procedures ;;1 L( v1 T  K; Q  U) `2 G* J1 x- q2 N
;;;;;;;;;;;;;;;;;;;;;;( v, r( T1 V2 ?- r9 l, Z( Z
4 a9 t: g3 `+ X
;; Initialize the display by giving the global and patch variables initial values.; u' o7 a; X% {' r1 V7 }" f. A
;; Create num-cars of turtles if there are enough road patches for one turtle to! t  z! `& l* ]5 @* y3 B' l8 s
;; be created per road patch. Set up the plots.
; i* L5 w7 l8 zto setup
# O1 ]8 q/ R  W% A! K  ca5 j# L5 `( t0 I3 R7 Y( @
  setup-globals3 \  R/ b1 J8 h4 D
) f5 [% S5 x8 E
  ;; First we ask the patches to draw themselves and set up a few variables/ T7 s" `' i$ V2 [5 Q
  setup-patches
# x) |/ P8 |* B% e. o  make-current one-of intersections
9 ?% j. C7 {( y3 ^  label-current2 V! @* _9 y- O' R3 o

" w- d& D/ s$ i  C' m) \  set-default-shape turtles "car"
* w0 I8 h) z. Q" o! ^2 Z; j; z' V. B. l4 l; R7 e( R" z
  if (num-cars > count roads)0 }& O) y9 B' x; Q% e
  [2 ^" G( ~" t. \1 z% ~& _
    user-message (word "There are too many cars for the amount of "% y) |# t  ?) q% t
                       "road.  Either increase the amount of roads "
& c! w- F5 o% D5 `                       "by increasing the GRID-SIZE-X or "1 W$ d  w3 H3 B4 E: ?
                       "GRID-SIZE-Y sliders, or decrease the ": Z4 ?, s2 f8 ?+ y/ Y- `' ]" Z
                       "number of cars by lowering the NUMBER slider.\n"& j6 ]7 @) ^/ k, V5 [  Y/ Y
                       "The setup has stopped.")5 y% p( u$ u* s3 G, k; W
    stop1 Z- E. e" o. r
  ]5 p' E3 g8 b$ v

  `& i0 a+ L) K- N' B! m0 q9 `  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color/ E, R2 R: }7 F! j: Z2 R
  crt num-cars
5 _0 s( s) y; P& i9 a1 w  [0 D! U2 I) t$ {- U* L  f
    setup-cars
& R, e2 W9 f0 y2 q4 I1 o9 S- w    set-car-color
# r1 Z! Z0 H; Z. I" K6 ~  H    record-data5 V0 j+ Q! a3 S" G" u+ R
  ]
( D" G0 H# c2 e+ Y4 c  M  G* W! O" F( u) H$ `9 c( q: p
  ;; give the turtles an initial speed5 H# ]& g2 N& X1 d5 v
  ask turtles [ set-car-speed ], _: b9 W& [: f

  M( n* I+ b! P* v0 e3 F  reset-ticks  y2 A& h5 x0 h, s5 h
end& w* G5 z) L9 D! Q/ _
' s8 N: @; |' }3 A5 [  I5 a4 ^
;; Initialize the global variables to appropriate values
: j( K6 |) O! Eto setup-globals' p$ t5 ^+ o" ~+ H  k. H5 c0 p
  set current-light nobody ;; just for now, since there are no lights yet& B' `7 h' X: T- [, s5 F
  set phase 0
/ a6 W# G3 l( q9 d4 W- `' _  set num-cars-stopped 0
! \. C! U# t2 C7 g  set grid-x-inc world-width / grid-size-x
  U4 l: w" r9 r% s/ @  set grid-y-inc world-height / grid-size-y
6 ]# T# u6 {5 L" Q8 E, b: O. }4 O8 F
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
4 V1 `- a8 A$ E4 c/ B# `  set acceleration 0.099
& F) y* D6 [8 ~& x  r2 P' Vend
5 J4 O) V1 o8 d, W  h
7 n( L0 ^" i9 [" i: U8 U;; Make the patches have appropriate colors, set up the roads and intersections agentsets,% ~% I' g- y: W8 k7 m
;; and initialize the traffic lights to one setting: m8 {1 V! x4 }
to setup-patches
8 T2 Q% y8 [1 I! ~9 ?  ;; initialize the patch-owned variables and color the patches to a base-color
, |3 D7 ^+ K/ \/ [  ask patches
2 A& ~- i$ A; h- i. c  [  A, x4 u% E" B$ t: X
    set intersection? false5 I* g1 n) E2 M; K. P7 r
    set auto? false
8 S5 _9 H: T7 F& `  u    set green-light-up? true
+ E5 {6 l% ?* |' d2 ^' y    set my-row -1
  k+ u+ x5 Y7 x3 X    set my-column -1
; w8 ^. X# g/ d% {; X( `    set my-phase -1. f& k, Z4 ]$ X$ p
    set pcolor brown + 34 V6 t) v6 @# s, |# C/ k4 ?+ b0 I" w
  ]
: L# x( G6 m% T7 e3 }
* V% p2 y/ |  {. v  ;; initialize the global variables that hold patch agentsets
2 ~, ~+ I) T! ~& Y5 A6 V8 l) b  set roads patches with! ^" Y/ ?0 T$ W+ V: |
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
6 _- y1 t/ g, u: q2 q; U    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
. y" w" b9 k: ?  ~% u* l  set intersections roads with. a' [) a# @8 k$ ]: M; D
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
2 j! z8 W- h9 U& |5 q; m( z    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]9 m$ h2 h: e9 f2 r' |9 m0 r

& K5 K& ^$ f, m* ]7 e# ~% r  ask roads [ set pcolor white ]# D9 F9 {9 I/ A. p, ?4 Q
    setup-intersections
4 Q3 k1 H! Y7 j* U1 T6 uend
9 V' [# N( L) {1 W$ K9 e其中定义道路的句子,如下所示,是什么意思啊?
, n' @1 [; E/ g1 G' V  f3 k set roads patches with
6 m7 a4 {8 f' Y    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or( l7 y: w: Y* n
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
! v( Y/ B# a. H' s. Z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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