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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。
7 w( b  k  S& O) h4 q* F4 Pnetlogo自带的social science--traffic grid这一例子当中,: V( c; D7 g, x2 [7 H3 E- Y$ ?3 M3 H
globals
. U+ J5 x2 q" d9 n  \  @[: [+ w& Q; l+ l5 y
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
+ [2 c. m8 M/ F- g% l" J( {  grid-y-inc               ;; the amount of patches in between two roads in the y direction- I9 {9 W8 o% }# Z, M
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if; l' H# \5 ~1 K
                           ;; it is to accelerate or decelerate
" }/ i" h1 E& ]; `% w  phase                    ;; keeps track of the phase  O. |3 [/ T( w8 w
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
! U6 F# k+ G/ N' \8 G  current-light            ;; the currently selected light
+ M7 ?) g% M, q& O0 \2 C; B4 N3 i1 m& t) c0 `  s2 M
  ;; patch agentsets
) m/ Z3 u9 I# b% B' y: m' h" d  intersections ;; agentset containing the patches that are intersections5 ~. `3 l) @; {: @3 Q
  roads         ;; agentset containing the patches that are roads
! d. a! W. v( U. [4 b! u]1 i7 ^& K" U/ G& z* B# I
9 L0 z' J# U& t, G) V, D
turtles-own
; s! c% ]: ~1 L5 {6 n[# h& k* W2 a7 ?2 ?! |5 _* t
  speed     ;; the speed of the turtle
; p! y2 s3 L; t+ S. F/ c  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
4 D) ^, r! @) F! B" S  I6 q  wait-time ;; the amount of time since the last time a turtle has moved; X1 U5 a% h" j& n' Z, y+ K, f2 ~
]
) A! C" W/ `5 J; M( U8 Y* }" Q' J
" n! s7 v4 D0 L0 `. n' U' Mpatches-own
) L5 {, k+ _! `/ b6 ^, P[' ]2 r9 Q. w2 L/ k
  intersection?   ;; true if the patch is at the intersection of two roads( r2 N6 V4 `; J, M1 [2 Q5 P
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
# L% l6 B9 l" ~' [! }2 a6 y: c                  ;; false for a non-intersection patches.
/ |3 f- H; H2 v$ m' }5 Q  my-row          ;; the row of the intersection counting from the upper left corner of the0 q8 M2 r, {4 i! s% H
                  ;; world.  -1 for non-intersection patches.
& i. b+ X; o7 A+ x: O: }  my-column       ;; the column of the intersection counting from the upper left corner of the
/ E6 f; F' U  m" R5 ~                  ;; world.  -1 for non-intersection patches.
. W& Q& m( J% t6 R" g; G" d  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
0 x- c; [5 k1 g  auto?           ;; whether or not this intersection will switch automatically.
$ w/ k5 j' A8 x3 [- h, w- ~' l                  ;; false for non-intersection patches.7 y. R; M; {/ ]  D0 X% ~! ~4 Q. R
]
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$ j+ x- a& S$ k0 T( y
3 d( s! [; O0 [% l; `& p1 Z/ ];;;;;;;;;;;;;;;;;;;;;;
5 \, I5 m4 ]1 A$ k9 Z2 ~9 a;; Setup Procedures ;;+ I; \/ K& m& t/ q* }
;;;;;;;;;;;;;;;;;;;;;;0 I6 S: ]1 k% _1 G* b
* `, F  [; t3 a2 D
;; Initialize the display by giving the global and patch variables initial values.- r3 I( h! F% {2 C0 p: t) N
;; Create num-cars of turtles if there are enough road patches for one turtle to
0 ?! H* [, r5 d) y7 u;; be created per road patch. Set up the plots.* p1 @- a& c( k7 u. x2 F( i' V
to setup
3 B- k  Q9 {% T0 d  ca
4 W' R3 }- ~' `0 k# b0 z2 i+ ^$ l  setup-globals
* ~; K1 t# d. z& }1 H0 v4 \; }: {
& c8 W1 r$ ?3 C. E5 T1 b. i  ;; First we ask the patches to draw themselves and set up a few variables/ A- d1 p) m0 t2 d% S
  setup-patches$ R* p0 N& z( [8 P
  make-current one-of intersections9 U: r1 e/ }5 P8 M8 G0 `" W
  label-current
' _6 E7 i" O: j- C* M8 g
) w! f7 _" F  C  set-default-shape turtles "car"
  o$ E: C6 l5 P# b, A5 \" ~: E, m' x7 H* t% n; p
  if (num-cars > count roads)
% Y0 F5 t! P, E! H% J) z# l  [
+ Z( i% r' L( j8 j    user-message (word "There are too many cars for the amount of "1 v# b# p8 m$ u9 F% t
                       "road.  Either increase the amount of roads "
7 r* i- o6 x* z1 A: K                       "by increasing the GRID-SIZE-X or "# b8 D$ W0 q7 `1 f* d
                       "GRID-SIZE-Y sliders, or decrease the "5 F/ g7 i7 l4 [8 |
                       "number of cars by lowering the NUMBER slider.\n"
, Z# D9 b5 `; @5 ?4 _( ?                       "The setup has stopped."): p! Y( n$ S8 a# q5 `( f
    stop
' p3 h' L+ }; G  ]% x* V5 F4 A! s0 h$ J

- I# t0 I1 n# W7 `# y/ [8 `5 [# p  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
! G- W+ \( w3 ^& v4 m  crt num-cars% d; e6 K9 X9 f% R$ R
  [# _: j$ ]. s& b- u8 K
    setup-cars9 x' A& y  Y; `9 h# ^, v# j
    set-car-color0 v4 i$ {1 f# D/ }# |0 L- d
    record-data8 p+ @1 X, e: I
  ]8 U" O. v5 [( B
8 u# x' @+ i9 R6 r7 |
  ;; give the turtles an initial speed
+ F5 d( a7 h1 a  ask turtles [ set-car-speed ]
5 \. E9 I/ Y0 ^7 K
' N' {$ w' A# }$ x  reset-ticks
4 p, A6 [# d" Dend
4 C  I  r' u$ k, P5 A; m* ?
- L8 r  o0 L& i7 d  e;; Initialize the global variables to appropriate values" _/ N; V& h4 D* S  U. [; n
to setup-globals5 ~1 a/ x% q/ q2 z
  set current-light nobody ;; just for now, since there are no lights yet
7 _8 V8 J0 E6 l- i8 e  set phase 00 X! K/ d* F/ v5 l; O. s1 E
  set num-cars-stopped 08 c0 i: C1 }5 H2 a1 `- A  u9 k
  set grid-x-inc world-width / grid-size-x
: T* P  r* T  K( c3 L  set grid-y-inc world-height / grid-size-y
: d- k: O, z3 y& e
2 S6 f5 ^3 v/ a4 g, ]  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
3 D. q7 e, |2 m: _  set acceleration 0.099. Q  e# z% I  ?& K: O$ M
end1 D0 Q8 B; o# J' w
) H5 b! y0 s5 v7 i! `/ [1 |
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
/ f9 s4 M, Q! v: g2 j& q' ?/ U4 x;; and initialize the traffic lights to one setting
  R8 L- @- {- L! A' y5 _to setup-patches1 g; C/ c: k* B" R- {0 T' n
  ;; initialize the patch-owned variables and color the patches to a base-color
0 Z# Y6 h+ _: _  P0 V0 P6 p  ask patches
1 B. q' a% v* n9 j7 r  [5 k$ d- w% U$ N. k% o
    set intersection? false
8 V$ p# H. l$ c6 K- ]    set auto? false9 y" {9 H5 O8 o% ^; ?
    set green-light-up? true
6 L# q8 g( K+ z, _( p    set my-row -1
0 ]( u* B) k9 Y    set my-column -1+ e0 U8 w+ x( `; B
    set my-phase -15 f& W! w. y* k( I  w
    set pcolor brown + 3
! a1 w: G* m- N0 Z  F  ]5 t/ }) y& G% |" N2 M

/ E( U. i" \3 ], K  ;; initialize the global variables that hold patch agentsets7 e; b6 j4 x* O: A
  set roads patches with
4 H- H; e% j  w6 b    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
& @: @. u/ |- L7 d$ [) D# K% S    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
) q- k0 s4 u+ E# N1 i: R& n  set intersections roads with
) F9 S/ v; `; Q8 c    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
3 c+ v$ Y# u+ @    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]" j0 T' @2 P7 b! I+ k" S
- N6 b& o! c9 u( y% J% F
  ask roads [ set pcolor white ]. K3 S% w8 ~& W$ [/ X
    setup-intersections
- Q1 j# y2 W& G& N9 g/ I* F! B( T4 tend7 x& {1 z/ S  G( A
其中定义道路的句子,如下所示,是什么意思啊?) M0 I- C0 ?& ^' |/ i
set roads patches with
8 u: B$ t1 F8 F. j, u    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or5 ^8 [" m/ s; t$ N
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
9 T  @$ f: K: X: ]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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