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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。
, o4 W, _: i7 ]' j& Ynetlogo自带的social science--traffic grid这一例子当中,0 R# l4 f  m, Z  H
globals
- ~+ P5 W! h, {# _[
6 ?/ k( o6 S8 k7 _  grid-x-inc               ;; the amount of patches in between two roads in the x direction0 n  x* |6 X/ v; v9 _3 L+ s
  grid-y-inc               ;; the amount of patches in between two roads in the y direction
: W; t7 Y! K1 e; ]1 ?0 |% E! ~  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
7 y8 ?+ e  {( r; X4 B                           ;; it is to accelerate or decelerate/ k/ s; v) x/ v
  phase                    ;; keeps track of the phase  V/ N7 {* f( y) O5 f, t0 D& q
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
+ o1 v' I( X( o  current-light            ;; the currently selected light
2 `* E3 |) W2 n# |; q" s$ s  e3 ^) }3 g0 E! ^, d5 e7 U6 j
  ;; patch agentsets' A/ Z3 B# u3 t
  intersections ;; agentset containing the patches that are intersections! B: Y% Q& U6 e/ D! \
  roads         ;; agentset containing the patches that are roads  ~& C" [- y. A# W! S
]
$ ?3 o$ i. S8 X$ B$ Q) f3 F1 o5 {' _1 w" D3 _0 I
turtles-own
. U* J* @) s4 J4 T' O4 N[7 R' v7 S8 s+ z/ K9 y: B0 I
  speed     ;; the speed of the turtle* ]' ]/ r. v$ R6 A0 ?8 O
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
$ y$ L- N  r- p  wait-time ;; the amount of time since the last time a turtle has moved0 p3 B9 }! a6 r' K* j0 y5 b! x
]& g* s* \2 P3 R

& u% Z4 T% B/ e8 m5 m4 jpatches-own
3 R0 ?+ Z2 i3 l' f7 z6 ^; Z( m[: _: S) t( ^! g
  intersection?   ;; true if the patch is at the intersection of two roads3 J) `1 M/ I6 |( t6 [) g" r7 g
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.2 J6 u9 E# w; R, l% q
                  ;; false for a non-intersection patches.5 d& B# j8 }7 T; F
  my-row          ;; the row of the intersection counting from the upper left corner of the
6 q* C5 ?* P9 R/ g* `7 O                  ;; world.  -1 for non-intersection patches.
' `5 b5 x- Q, A0 |  my-column       ;; the column of the intersection counting from the upper left corner of the
% v( ^7 @' x/ ?/ R# v                  ;; world.  -1 for non-intersection patches.
% ~& j/ m$ ^3 K+ l6 p- J9 s  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.! n: C+ m) N3 S5 U- e3 [
  auto?           ;; whether or not this intersection will switch automatically.( N) J5 F+ @0 t1 p, r2 b! Q
                  ;; false for non-intersection patches.
" w  l. v6 v: t]3 Z3 z4 d1 c6 O  l' T1 A( U6 _

: x6 s: d% G* O6 F% e  P# Q* k& K5 [9 b* b) |- D2 F/ x
;;;;;;;;;;;;;;;;;;;;;;7 e1 {3 J* p7 ~; w" }5 g, v
;; Setup Procedures ;;
1 K: E" t5 ^3 t( R3 e5 m;;;;;;;;;;;;;;;;;;;;;;/ [! Y( V' a2 M# K- @
. x' V3 B4 @3 n0 M9 ~" M/ L/ k
;; Initialize the display by giving the global and patch variables initial values.. i0 d6 S& g" O( p) D0 a- Q6 p
;; Create num-cars of turtles if there are enough road patches for one turtle to
7 U2 r5 N# w3 K" a( V" V- q;; be created per road patch. Set up the plots.
/ x4 m+ A( B& g) q& nto setup1 ~0 M0 N9 ~/ U' \* N' {# Q" @
  ca% o+ {. a2 {" F! }# V* B( r
  setup-globals
7 r1 j0 U7 c0 D! y% ]5 c
6 ?! d7 b- L! d6 m+ D- Y( o  ;; First we ask the patches to draw themselves and set up a few variables' b) l$ {  {8 t: {$ L- F3 u: [
  setup-patches3 ^) d. ~  b. X# C) s
  make-current one-of intersections- h5 n  \+ f, q6 n
  label-current7 Y% x2 L  E6 ~* w% h/ S
' {1 S) }* N5 ~4 M0 H4 A
  set-default-shape turtles "car"
- E( H0 d- R9 ]! n5 P# X1 s( E1 ?% \3 v( B. Y0 n+ H+ N
  if (num-cars > count roads), t, `4 }7 k: e& ~
  [, J+ M: s0 T* y+ w1 S
    user-message (word "There are too many cars for the amount of "
& C8 Z5 V* Q# i% t, }( ~) s                       "road.  Either increase the amount of roads "* Y0 L/ ~4 r# ^6 n) U. z( c
                       "by increasing the GRID-SIZE-X or "
+ P. n) a2 u4 ~* q  l% y                       "GRID-SIZE-Y sliders, or decrease the "
, r4 V. t3 z* W% e                       "number of cars by lowering the NUMBER slider.\n"
) X! o/ _0 u5 ^# Y                       "The setup has stopped.")
1 j, ^' a* c3 G9 J" X# S7 T  V% g    stop
" u1 {+ P3 k8 t/ c  ]: V: L6 Y% X6 u

4 i* {4 h6 M7 v+ Q$ V  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
" ~; t$ @7 {: Y* W& x/ t# c3 m' j  crt num-cars  u: i" i& r3 Q
  [! e8 i+ g; l- I8 E7 V
    setup-cars
) p3 Y9 Z6 O" l. J9 I* `    set-car-color$ |) u& r% _$ p* G% i
    record-data
% y; k0 ~4 k1 Z- r7 M' b  ]- D: e  Q! j4 G; l7 i4 {" B
4 q9 S7 {, h8 t! m0 t
  ;; give the turtles an initial speed# Y0 u* W4 x. |( a) _8 x
  ask turtles [ set-car-speed ]
% y' e. @! w/ W; D. G1 ~
+ i/ o* @" L/ T7 d. u4 n  reset-ticks: C2 {' r) l; {+ I0 O5 r9 S
end
* E' ^) a7 A4 M4 O, h8 ]0 s8 \6 G
% o, y- ]# P. G;; Initialize the global variables to appropriate values
0 \. ?+ s, s8 k7 j2 i, `to setup-globals! l  K$ S6 T+ i5 U6 @
  set current-light nobody ;; just for now, since there are no lights yet. a# x% u2 H9 C( Z; k' ?
  set phase 0# F3 o& W' W, Q* n, F/ N
  set num-cars-stopped 0
1 ?8 b% U& Z3 b5 A; j) c) ]( c, G4 u  set grid-x-inc world-width / grid-size-x
& X, b# i4 Y+ U, C# K: A  set grid-y-inc world-height / grid-size-y
" z" I# F2 t0 }9 \, ~& e/ w1 a
  w2 ~6 w% t" C1 x  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary7 }$ }& Z* C1 p9 p! q
  set acceleration 0.099
# d  x2 p- z& V" p, Jend
3 G1 U* \# a( S( }6 @, o! k/ i+ i
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,/ c7 M% `( k: Q' l
;; and initialize the traffic lights to one setting
/ H  O* ]7 t$ H& \8 Zto setup-patches- U5 F' C# J0 u9 T; }* C3 O
  ;; initialize the patch-owned variables and color the patches to a base-color
& J. V8 O  H) ~: p& o# J  ask patches9 {! X: G4 c& \
  [1 o9 p/ a; P7 k; \) l3 z
    set intersection? false6 U/ q) d3 V& H
    set auto? false
2 v* ]/ I: k- v3 M0 x; w    set green-light-up? true
9 E# E1 X- O7 g3 ^6 K* g    set my-row -1
4 I7 z% f! k7 N) |2 D  g) Y    set my-column -1
" I+ ]5 D3 q% W2 a" }1 O    set my-phase -1. L( M6 w3 B8 t  q4 y- p: |
    set pcolor brown + 3
3 P6 I% g+ y! }  ]
* N5 q! ~0 p7 n/ e) s8 {, o1 B# L, e
  ;; initialize the global variables that hold patch agentsets
+ D# @* B; E6 Z7 N# b* e  set roads patches with
  f) z( F. b# F    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or, U' j$ l0 @# h- a/ M
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
. l" J% c3 ~( {' Y- {  set intersections roads with5 E8 a) s* T/ V# ]1 m0 k
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
$ s: ?( m2 U" e) y    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]( y9 j9 q* N+ j; ?4 R) ]1 M% ?7 V! u

, o( t8 p" v+ @3 S7 K2 [. C  ask roads [ set pcolor white ]
% ?# u: n0 g! {$ D. {* X    setup-intersections
3 [% y% {) r* [9 E' Qend
. g, x! F% [  `+ {. W# G其中定义道路的句子,如下所示,是什么意思啊?
$ ^7 T. N) ]* ?2 h! n7 O8 U set roads patches with
# V$ |8 T; M7 z( W* c& U* `    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or0 _% z( K; \  z
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]4 v- p" o& j9 @
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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