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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。* D1 ]8 o* W9 Y: Q3 f
netlogo自带的social science--traffic grid这一例子当中,0 a9 u- p" o2 I6 J; D' t
globals! ~  J; V' n' o9 u3 e
[
3 N+ }7 O$ g% }) p. D. o: {8 L: X  grid-x-inc               ;; the amount of patches in between two roads in the x direction/ U5 ^$ v' c7 G  @" b
  grid-y-inc               ;; the amount of patches in between two roads in the y direction
. S( P" o" ~+ y# ~' u/ N5 n  acceleration             ;; the constant that controls how much a car speeds up or slows down by if" O! v/ U. j; e
                           ;; it is to accelerate or decelerate, i: O* h) S  c. w) u
  phase                    ;; keeps track of the phase7 P" o+ Y/ U% E7 M' y
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure6 M* v# u0 {4 c" \& i
  current-light            ;; the currently selected light0 b0 |* ?9 v) l* F1 R  B. J

/ G2 l; _- G  R* V7 B5 k  ;; patch agentsets
. |- W. y+ U$ [5 t( P  M& D  intersections ;; agentset containing the patches that are intersections$ V2 ~! K% t+ J7 G
  roads         ;; agentset containing the patches that are roads4 o6 C0 R4 c. Y* I
]
, H% q$ `- d) F( g6 r# d" p
# G8 Q0 t' D4 H! Q+ ^. g( B* aturtles-own
' b4 ?1 W2 x* q  v+ H[; A7 [9 b* p5 f+ r% n
  speed     ;; the speed of the turtle
# `2 N7 t( _) ^/ d9 h  up-car?   ;; true if the turtle moves downwards and false if it moves to the right' `+ [0 f5 S+ k
  wait-time ;; the amount of time since the last time a turtle has moved/ c5 h1 P1 s' i; X) p. U" j* c
]
; v3 B. s0 L/ E$ _8 k9 u
0 e1 l1 Q* z0 \' e6 e, wpatches-own
( G7 N. r3 u. L7 w' [5 Q[
+ s& l" ?( L2 a9 O; h; A  intersection?   ;; true if the patch is at the intersection of two roads5 [, ]; c7 h7 s3 n: S: e0 x9 L
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
1 d% O" t0 K4 v/ x                  ;; false for a non-intersection patches.
% ^2 F( M' ?4 h0 A0 u  my-row          ;; the row of the intersection counting from the upper left corner of the6 j# ?8 g, h1 L
                  ;; world.  -1 for non-intersection patches.: r4 h) A- Q8 r1 ]- P
  my-column       ;; the column of the intersection counting from the upper left corner of the( z) a( o  b, [3 F: G( ~. f
                  ;; world.  -1 for non-intersection patches.
, @8 t! W+ m% a" Z( S  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
2 L# V' d9 R* K$ b+ o4 V  auto?           ;; whether or not this intersection will switch automatically.
/ \" Y, x# D/ G: r- B                  ;; false for non-intersection patches.
% }4 q" X2 D. D' ~' v]
6 u, w  v$ d: o9 s; f$ }# R; c) ?0 `# `9 \; S
5 Y/ F* {9 J0 c9 W
;;;;;;;;;;;;;;;;;;;;;;9 E' k9 |8 [2 ^. N+ n
;; Setup Procedures ;;
& R8 z; ]- _/ [: h;;;;;;;;;;;;;;;;;;;;;;6 L" N# k6 I) I

& J8 A2 U7 y6 B: z" g- y;; Initialize the display by giving the global and patch variables initial values.! p, [) x4 b8 s3 j1 x3 c* ~
;; Create num-cars of turtles if there are enough road patches for one turtle to
; x6 C  S. @3 v, s: B;; be created per road patch. Set up the plots.. U5 q' _# h: G3 [
to setup
: x0 ^' w/ {% r* G# V  ca
$ K5 Z5 {/ m) B% R  p6 S8 \3 ?0 g# [) M  setup-globals* J; |; \$ p" w) l* x4 x
! n( G) m. D( Y% S4 ^7 B
  ;; First we ask the patches to draw themselves and set up a few variables
2 m3 T6 I; Q3 \: x4 N, w  setup-patches
( g3 N/ Q2 `, C7 K( l+ c- m  make-current one-of intersections
6 y6 [+ T" k2 R. ^4 r  label-current2 K- Q" F. u8 Q, |2 R# h

9 u5 i) i, q8 y" _& N  set-default-shape turtles "car"
. ]# N" k4 l: c* w$ ?. O# B; A# h# Y, S% ~4 H5 \, u
  if (num-cars > count roads)
8 R& @, i% X/ g6 r  [9 k. z& T& Q6 n# I# U3 g2 ^0 ~
    user-message (word "There are too many cars for the amount of "
0 q* m% R2 ?; ^" \" M% K& l( H                       "road.  Either increase the amount of roads "" k; G' S( I: R! N; |) E( Q
                       "by increasing the GRID-SIZE-X or "2 b3 v- |% W$ y9 z5 X
                       "GRID-SIZE-Y sliders, or decrease the ", ^3 J! L* i9 G) K) m# R
                       "number of cars by lowering the NUMBER slider.\n". `7 y) _' o8 U+ o4 C6 F2 z
                       "The setup has stopped."), k: M# W0 V: W0 D: D, [, r/ T  Q
    stop
! k3 x9 p- U; G+ c3 {; ?4 |  ]& o5 L% R) c% e  T
  l1 J  v3 t- F- j3 u/ X7 Y
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
8 }$ V3 k9 Y  M# W% X- V  crt num-cars
$ i" O9 f" \1 L7 u3 o: s. K  [# z& j) g: }! u, F& {
    setup-cars& V( W9 B, _( m- T  ~
    set-car-color
/ G6 l4 G. R% l    record-data
, K# q* G8 q  f  m1 X% ]* o- |- X. j  ]
. d' m3 i2 l% H& U8 w: {$ V; e; ^8 e: u3 }9 @
  ;; give the turtles an initial speed0 g7 t! L, U) g) k# h- ?, `
  ask turtles [ set-car-speed ]' q( }, M; A/ L/ w% t" P
' C6 D9 w, M% @! x  k
  reset-ticks
- s" D0 n5 s( [8 Q" L9 @: E8 Nend( ^, F. b: y) f8 j6 G$ n7 k4 J) w6 ^
: z3 J4 p2 d2 w$ `8 ?8 ~* |* Y/ H
;; Initialize the global variables to appropriate values
  i5 ]- @6 w" P1 ~to setup-globals# Z! Z- x- H' D$ h! h
  set current-light nobody ;; just for now, since there are no lights yet* W6 Y- O8 [) o) p6 v% B
  set phase 0
" _1 u6 q  J7 v! H) i2 G  set num-cars-stopped 0
; h0 q- U, Z- Q  set grid-x-inc world-width / grid-size-x% L! m7 w. b9 M9 ^
  set grid-y-inc world-height / grid-size-y% O$ V( @; h) l' F+ X$ h

  X. [$ ], ^5 n# L9 r. E& O9 N; ?8 ]& Z  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
  E; h+ I  J2 x" R  N- E0 F! n  set acceleration 0.099
) s% p5 {/ S* p6 {  Dend
: ?( ?9 A4 y5 v' H6 g
4 m5 v: r# ?7 a; T- t7 m;; Make the patches have appropriate colors, set up the roads and intersections agentsets,! A/ N/ U( S4 ?
;; and initialize the traffic lights to one setting
& B; M- E' p$ ^0 c% B" eto setup-patches
' `7 B+ p  }% o' S/ c3 z  ;; initialize the patch-owned variables and color the patches to a base-color8 Z# `' \) z# X9 C, i$ H! _/ K
  ask patches( H1 k/ G  I: ~! q$ K& u
  [5 h/ M0 ?  f5 |' \" c" W
    set intersection? false$ {  l! V6 [5 b, r/ `8 v
    set auto? false
( N# W$ v: f' F0 }: h9 B$ C    set green-light-up? true9 _0 O$ M8 n4 u4 C  f5 [$ }$ k
    set my-row -1
* G1 r8 F( U9 S2 T    set my-column -1! T" Y9 }5 R) K; j2 J1 C  H$ ]9 z
    set my-phase -1
% x8 w" r7 S' D    set pcolor brown + 3
: X- R2 r) c- f- B. e9 s  ]
9 [: |; b4 z: ^8 r# q9 `4 d$ l+ X5 p$ B& `$ I2 ]* d0 z% Y
  ;; initialize the global variables that hold patch agentsets
* X8 D& j3 v0 W- _2 _  set roads patches with6 F8 b  I, i, b" h# Y* L. @
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or+ [" a. B# W3 N( j
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]  H  r! q, h; P: W) S$ e  k
  set intersections roads with( u9 f! A5 `& X3 V3 X5 X
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
/ j' L* z& q# l) ?    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]$ v% t4 R2 P) F( `/ N
9 V6 R0 w0 M  K$ T) s  n
  ask roads [ set pcolor white ]. V/ J6 w# z8 ]. K6 E1 t% q
    setup-intersections
5 e. Q) @$ K: T9 U' Hend
; h" ~, }- c! f  n其中定义道路的句子,如下所示,是什么意思啊?
& D6 B6 g: |+ P! Y$ k* Q set roads patches with: b/ X3 D# m4 |7 C- F3 M
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or" E# V: t! o% ~/ C9 ^
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]" Z1 y: S4 J& U8 U- d
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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