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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。$ f1 W! p* L1 K% ?  P
netlogo自带的social science--traffic grid这一例子当中,8 d; W0 R. k% Q% _- T
globals. d; S! K' q1 q- k5 D
[
- m5 X  m$ U( m3 c  grid-x-inc               ;; the amount of patches in between two roads in the x direction
) q8 r+ u+ V: _( m  grid-y-inc               ;; the amount of patches in between two roads in the y direction
  Z4 V+ Q( T- P1 x2 S  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
3 T. B  c6 v6 l, K                           ;; it is to accelerate or decelerate  ]" d6 e$ _1 \8 j0 h# O7 y3 c+ T
  phase                    ;; keeps track of the phase$ ~- t% z0 n+ m4 _
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
2 w4 @& X/ T* h; F# C" X  current-light            ;; the currently selected light: j0 `+ x9 p' d) L& h" |
. x) u$ F5 }5 L
  ;; patch agentsets
: C: Q9 P) N' t  intersections ;; agentset containing the patches that are intersections
1 @5 t+ d6 {# f; c& `% z7 P6 o3 R( ~  roads         ;; agentset containing the patches that are roads( A. D2 Z( q$ H$ M3 ]1 Y% N
]
0 O- {3 |$ j! P9 r, X, {
  R/ e* g7 C0 g* D) wturtles-own
! ?! g" D: w3 `* D* d6 B[9 F8 I8 v, S) C7 W- @
  speed     ;; the speed of the turtle
& u8 ^5 s3 g7 k7 {2 E" i# B  up-car?   ;; true if the turtle moves downwards and false if it moves to the right  }: b# G( ~! z5 @) D! B
  wait-time ;; the amount of time since the last time a turtle has moved
( ~4 l& F! o" s]; b2 ]5 Q5 N; s1 C* F

0 M4 F. ]# R, ^& y  n/ `0 ^6 ppatches-own% j. c% K# G& y) g
[, z1 M* k% U( \  o. F* ^8 ^
  intersection?   ;; true if the patch is at the intersection of two roads
- F- m7 u+ i" m3 Q3 B* d  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
1 f" A0 Y$ p, Q8 N                  ;; false for a non-intersection patches.
0 `5 {9 g4 P* R- l  my-row          ;; the row of the intersection counting from the upper left corner of the
# `- D+ U1 ^; A/ [! F                  ;; world.  -1 for non-intersection patches.; H4 O, G8 @' H: F4 ]1 m
  my-column       ;; the column of the intersection counting from the upper left corner of the, J' w& q0 b: S, V& K
                  ;; world.  -1 for non-intersection patches.  H4 o% e' p' L* N
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
5 x3 j) E  J( Q1 u3 ]) q  auto?           ;; whether or not this intersection will switch automatically.( j9 G3 P7 S, u' w( ?+ [+ x
                  ;; false for non-intersection patches.$ o: L" _* U. x. w* T& c+ L$ w
]. D# A4 X! r: G" |$ c' ?; u

3 y! ^( r" `" h* r, f- c3 V( u
;;;;;;;;;;;;;;;;;;;;;;9 M0 U% X0 j. v) `% R! O: ^" s
;; Setup Procedures ;;
7 Z* F; E& ], a0 r9 z;;;;;;;;;;;;;;;;;;;;;;4 o7 q' w4 l9 @8 I" W  _
& \, ?$ c0 K8 F( d5 p
;; Initialize the display by giving the global and patch variables initial values.
0 @0 s0 a+ z  G, O# c/ @;; Create num-cars of turtles if there are enough road patches for one turtle to
- g5 K( @4 E- b* s! m9 n;; be created per road patch. Set up the plots.
) f) {, P" _( t7 Y8 Eto setup" v3 c) g( p: z0 r) M
  ca
1 f  L8 u, D. f9 p9 G  ]/ g  setup-globals
" [+ W; a9 Z9 f+ I* o% t: b2 [: w  M3 l2 @0 w2 i/ P
  ;; First we ask the patches to draw themselves and set up a few variables  \! L4 l; O. S8 u, o3 H
  setup-patches* j1 d+ N' f. l" |0 u
  make-current one-of intersections
: U( U) p* t7 t" i# k  label-current
" k% H6 `  a2 f7 f  ]9 h0 ]. Q8 ]! M1 J7 w" N3 t
  set-default-shape turtles "car"* D2 t, }$ Y, N. M+ l6 D+ V
; Q& c0 y1 l$ S) U
  if (num-cars > count roads)
2 v4 `. r! Z+ n. ~( a7 h  [
0 Z3 v9 V& U% D+ d* E2 [$ }    user-message (word "There are too many cars for the amount of "
. c, i1 `  ]  R& J" H- {; w2 C                       "road.  Either increase the amount of roads "
0 v3 A% [  M& E7 A$ Y                       "by increasing the GRID-SIZE-X or "6 k# @- d: j5 q" u
                       "GRID-SIZE-Y sliders, or decrease the "/ W/ V4 f) W7 u  k! Z7 C( L2 s
                       "number of cars by lowering the NUMBER slider.\n"6 w4 F, W, _: C+ y% [+ s
                       "The setup has stopped.")( q2 n' w) j* u5 B& h
    stop* W( {% f& C' H
  ]
) o5 T. o4 U3 S% W' z9 T, {; f  _8 {2 B! y  ?0 q0 Q
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
: I- {/ @( R! p  crt num-cars
8 d# ?8 H4 D4 [) a) K6 j) P6 A: y; p  [
6 I/ k  |5 G9 J6 {4 Z    setup-cars
0 C6 r6 e1 X  j3 v    set-car-color
2 j8 H7 U+ B1 L& V" J    record-data% l8 k/ Z! k8 i' Y
  ]
$ L3 {' H. {1 F0 K7 t9 W; e  O) v3 ?' ^
  ;; give the turtles an initial speed: U, R: n8 Z2 ^
  ask turtles [ set-car-speed ]% l" h  M( y+ W& O8 F% c& G" X
" {- f: M# `( F2 Y
  reset-ticks7 w5 s! B# ~1 R, i% f1 {
end: m1 L1 ?" B4 C6 a  \7 S

" n0 I2 B( Y7 C" e! g+ t; h;; Initialize the global variables to appropriate values. S, y& y( I9 i
to setup-globals4 \# r' a5 \& X: \8 [) u5 O
  set current-light nobody ;; just for now, since there are no lights yet
8 V3 ^& W4 L) Z4 p& m  set phase 0
2 E$ A2 f3 S$ J  S6 }  set num-cars-stopped 0
6 R% G) @- i/ s& u  set grid-x-inc world-width / grid-size-x
; [. D$ r7 d. \, o. n  P  set grid-y-inc world-height / grid-size-y4 D8 H1 w! A4 D- W7 c% R) e
6 V: K0 G, m4 B2 ^2 z. {
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
3 D: m# h) D! E1 x: ?9 a+ k  set acceleration 0.0991 |- A# Q" k8 N; N8 Z: E' j
end2 J, a" B1 H  w1 l% e

% N' G2 _# [2 I% \5 x;; Make the patches have appropriate colors, set up the roads and intersections agentsets,4 H# {8 y& N. `9 C- U
;; and initialize the traffic lights to one setting
5 }* o& H6 {3 k8 l1 Fto setup-patches3 G0 A  D, [6 R, ~2 G; b5 e% E
  ;; initialize the patch-owned variables and color the patches to a base-color  X7 Q# L# p0 _4 ^+ X& Q6 Y
  ask patches/ N1 i: m7 K4 Q
  [( X5 q' L: R1 z
    set intersection? false# `. e3 F" l' c
    set auto? false/ Q4 X6 o$ Y& R# m5 |+ T* {& B8 e
    set green-light-up? true
2 B# P, X; o! s0 R: F3 t. h( z    set my-row -1; N5 R7 H$ Z. `& a
    set my-column -1$ x* e  ^' T- W& Q; f, W
    set my-phase -16 t* g# {- t& j3 H  O
    set pcolor brown + 3
: \7 o, Q! b3 \) G2 U* ~; z$ L3 W4 q% T  ]8 |" B, J& V5 [# i% e, Z
3 z7 _7 b7 j8 K. e9 X' A
  ;; initialize the global variables that hold patch agentsets* u% o3 |  T8 K
  set roads patches with- d/ I  k& ]1 M! b* r
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
  Y" J! f! Y- D. S    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
# Y0 t2 l3 F' |. R  set intersections roads with
5 I2 \5 _6 e4 u    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
+ k, a+ H) A) t0 j9 w. [    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]6 z, Z) J+ B2 F2 {% n; I; d
: t+ i+ B4 U2 {4 e6 _
  ask roads [ set pcolor white ]
* v- D% {# \4 M: F, `) O    setup-intersections7 H: J8 s" G9 G* H( e! v9 u+ b1 q
end
, D* M) y1 Q4 d4 \. @9 R其中定义道路的句子,如下所示,是什么意思啊?. y& K5 U$ T4 t
set roads patches with, u1 s: G# u3 Y- u: q% z) _4 y8 f
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or. T' I8 N/ T5 S2 a: ?
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]2 x, y. w% W. Y1 u& 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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