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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 T: X: r" v$ z1 f2 H" Qnetlogo自带的social science--traffic grid这一例子当中,
$ I* ?' x6 c/ [) }- Kglobals
- w. [7 S6 {0 I[
& p. o4 F  _! w: U/ ?1 Y/ L  grid-x-inc               ;; the amount of patches in between two roads in the x direction
/ T0 E% ~, G( d  grid-y-inc               ;; the amount of patches in between two roads in the y direction
. ]5 ?. a8 R5 H( O8 n9 M  P. U  acceleration             ;; the constant that controls how much a car speeds up or slows down by if$ e! H. q0 [4 X7 b
                           ;; it is to accelerate or decelerate
/ t$ L2 f* |- k- e* G) b: I  phase                    ;; keeps track of the phase. y# E8 l. S. v( D6 B
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure8 E5 @/ p( Z) g# v) q
  current-light            ;; the currently selected light
5 y$ a4 E# t7 m% O
5 _+ w8 j" e. L- |  ;; patch agentsets! q1 s9 y$ O4 ?4 }& t- ~
  intersections ;; agentset containing the patches that are intersections  Q0 }3 I' N- ?3 s( L
  roads         ;; agentset containing the patches that are roads
1 {0 Y; [: F* _- P& L0 y1 m" v]7 C$ b3 N+ s/ {  o' i; k( E9 J

* w0 \9 d1 `! |, b0 sturtles-own2 Y+ O5 q% m8 X4 P
[4 r6 W/ Y# B4 E9 t( t
  speed     ;; the speed of the turtle6 E/ T. r/ B" |2 p! p+ f9 D
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right1 f) r5 L6 R4 `0 f4 W+ p- o
  wait-time ;; the amount of time since the last time a turtle has moved5 D! L, ?7 n% a' C% V3 w, ?% o
]$ F* u* @% K, o5 j* ~  v: }
' [# U6 R/ E" B  `& A. `
patches-own6 Y: m2 f# O0 {% a
[
& g% h, _, ]7 f+ |2 \3 r  intersection?   ;; true if the patch is at the intersection of two roads
# T& f: _: k0 i1 E( r; P' L% L  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.8 d" g1 _, ~" o5 Z' ?2 Z6 y' t
                  ;; false for a non-intersection patches.
5 q: Z! c) e# w) f0 t7 r! v  my-row          ;; the row of the intersection counting from the upper left corner of the; E9 }$ F! j  _" |( k- J* w# I1 X
                  ;; world.  -1 for non-intersection patches.
% K: H6 d9 Y% p+ p6 y/ `1 I  my-column       ;; the column of the intersection counting from the upper left corner of the# c5 n+ E! k( D  ?
                  ;; world.  -1 for non-intersection patches.7 r8 R& E2 G  V0 s
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
3 |; L1 _8 W3 n( {  auto?           ;; whether or not this intersection will switch automatically.7 U( }- ~8 J' V; p: s
                  ;; false for non-intersection patches.
/ ?1 G+ s5 H0 ~( t: R& Z9 \! }], }' o2 D: t6 z; A0 P; k7 S- L9 H

3 L6 f1 r! }0 n- M, r: _
. k1 M- A* o2 H/ ]5 b;;;;;;;;;;;;;;;;;;;;;;
- ^7 `$ T- l3 @0 `& {; |;; Setup Procedures ;;  Z) ^$ J6 D  G! t! |
;;;;;;;;;;;;;;;;;;;;;;4 j/ _) T7 M7 @4 L& o

4 t) |% B# F1 q; H* T2 m$ T;; Initialize the display by giving the global and patch variables initial values.7 L0 `9 D+ t: B9 P+ J; c* h* J; z
;; Create num-cars of turtles if there are enough road patches for one turtle to
$ `( M- A; i6 M, p/ Q9 r6 v* w;; be created per road patch. Set up the plots.
; l7 r2 u+ k6 bto setup! _7 F! ], T0 F1 L2 ^- `# a
  ca
' T5 u: g8 C9 s+ V/ x  setup-globals
6 O. H! Z; t0 k$ l8 f9 U
2 a0 W' j. \) G% F  ;; First we ask the patches to draw themselves and set up a few variables
1 n3 b* n. q# v: W4 o8 n- k0 x  setup-patches
3 \) \, A" ~% [( X' s2 Y* ]7 l  make-current one-of intersections9 f, l. d; Q+ B+ s
  label-current* \. s9 w# c9 t! O0 }% B

" Y( p: W' f( g5 D6 X% Z2 s1 [6 L  set-default-shape turtles "car"
- E- i+ n& W7 j& |, u) Y) S9 Y$ M, ^! w" m
  if (num-cars > count roads)
  ~3 Y1 o8 ^( L  [2 C. b) N$ Z; a% d
    user-message (word "There are too many cars for the amount of "/ n' }! J5 @8 [0 T* m! C1 A
                       "road.  Either increase the amount of roads "
3 U% U4 `! L5 J4 i                       "by increasing the GRID-SIZE-X or "
$ w8 a/ h/ ]4 K; w4 H# F# N                       "GRID-SIZE-Y sliders, or decrease the "
2 }) B7 P; O& Y& s                       "number of cars by lowering the NUMBER slider.\n"
$ i5 |4 g3 `, ~9 J: U                       "The setup has stopped.")& L6 z: r( j+ q8 F
    stop
4 k! k& h4 r" {2 T- G  X  ]+ v( o+ u# Y0 f7 H& P
- [8 m8 R6 H+ d0 i
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
% o( ?- B7 w/ E) J; q  crt num-cars* @2 X8 b" a9 C5 Q  x; l
  [
, T( o9 {8 e- r5 q" ~  m% N$ z% N    setup-cars
* W6 B% a5 h/ K! Y3 \    set-car-color4 J$ ~- r+ l" S7 K! c1 I
    record-data
! K+ |2 S, z+ n+ Q  ]/ i: t8 e! b$ [4 A4 r( I; U

: }: k) D6 ]; }/ C3 J  ;; give the turtles an initial speed$ A% k8 o" Z' p7 Q
  ask turtles [ set-car-speed ]7 A1 }' m4 V; u) K  v9 E/ w

, d" m6 t( Y$ F0 Z, g8 G  reset-ticks
* G2 ?# f& C; Y. l. C. Lend
) ?' E7 B2 U9 ^8 D) n( B- z; Y9 t+ I" ?! A9 M1 d" O
;; Initialize the global variables to appropriate values
( N3 P! g( J: R7 I- Cto setup-globals# k! G2 H2 H5 @6 T; [" [4 F" c" Q* C
  set current-light nobody ;; just for now, since there are no lights yet3 t, V/ a& e( M, ^
  set phase 0
1 [8 m( t0 n& F; A+ p9 |+ ?  set num-cars-stopped 0
4 E6 `' }% W- Q9 E3 ~9 M9 d  set grid-x-inc world-width / grid-size-x0 m6 g! g" s1 K7 \- Z
  set grid-y-inc world-height / grid-size-y
( z8 x( Y# z9 r# `  N  F% Y: S% l. o2 I1 |% j9 _" x% O
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
, M& }2 h% u+ y7 ~4 `$ Y7 w  set acceleration 0.099% y, m! P+ c) j6 ]# J  g: d
end
+ n1 I' s; C5 D- [! ~
3 ~, p: U' C  E0 r" b;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
6 Q- d- ~! k% y;; and initialize the traffic lights to one setting# ]% F0 Y* |$ O' f# Z' x
to setup-patches
, U2 m$ c! {" |% X& Y  ;; initialize the patch-owned variables and color the patches to a base-color
. ?( f( O" |; H: _5 m5 d6 j, D  ask patches, }8 w! e; T: W# ]
  [( p- X8 c# o( u+ P
    set intersection? false$ p3 M% u/ _( E# M; K
    set auto? false3 E5 x8 P0 \1 x( u
    set green-light-up? true+ A- e4 I% ?" W  y! x7 Q9 n& X- L" J
    set my-row -10 l( U* ]8 ^* }: u) q% w
    set my-column -1
# k% s6 u, h1 V& N2 Q2 n" p    set my-phase -1
. w3 w! Z, V7 J- c2 k* Z    set pcolor brown + 37 u- K% l7 |- c, J8 A
  ]2 `1 v& w+ E& s+ G$ R$ s/ z, W# K
0 n. n$ q' p4 Q$ Z
  ;; initialize the global variables that hold patch agentsets. U. H2 |/ Z; g
  set roads patches with  Z) N3 ]2 N" N& h1 [/ n3 w# u  `- [
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or4 _7 }4 J& ]: u1 v2 t) ]6 g
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]" J0 V% l" l% _
  set intersections roads with0 W( p0 K6 e* j' N' k
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
) q  G2 C$ q5 E% \/ \3 }$ J    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
. U) ]$ e: F. c! T3 z& B4 |  R8 @$ }! F0 O7 F! q2 m
  ask roads [ set pcolor white ]
# V, O  h/ _8 l/ O9 K$ g; v5 N    setup-intersections# X$ W2 _# H! a$ V
end
% `" x- N% u) a7 k% S其中定义道路的句子,如下所示,是什么意思啊?& A& F% ?- |' k
set roads patches with0 j% E& c5 N- k- D2 S
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
/ |' S2 Z5 o# S- x2 r0 k    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
8 p2 s' E6 J$ K, @: e2 G! 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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