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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。
/ x+ ^; ?0 e/ B! @( Z! V" _2 \* wnetlogo自带的social science--traffic grid这一例子当中,
) t, t$ [, N5 r5 m' a9 Lglobals4 K; X& h* ^( l/ N& u
[
  o4 ]1 J1 ~7 @  grid-x-inc               ;; the amount of patches in between two roads in the x direction7 O* @9 L. e1 o; A8 Z
  grid-y-inc               ;; the amount of patches in between two roads in the y direction. J5 G' T# v( _0 l2 @& F
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
* |) X/ n( P- }) n                           ;; it is to accelerate or decelerate
6 V% ^: K$ ]3 [" B/ u9 Z+ n. f  phase                    ;; keeps track of the phase
7 X" p' Q2 k8 E- J, ~  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure5 \+ c7 F, l) f  S! m  t2 G2 E, S
  current-light            ;; the currently selected light* d9 ~# }7 Z" l5 a" H

9 t; b: e. z4 z2 |6 q4 X' c7 ?# s  ;; patch agentsets( b0 ^4 p5 U3 R$ \
  intersections ;; agentset containing the patches that are intersections$ R7 ^, s( P+ C' T
  roads         ;; agentset containing the patches that are roads
9 @# D$ b0 W- r( e2 @6 v3 I7 l]
' h+ M0 p3 t4 `. }# J0 s/ w" A
9 R8 c& G1 J2 @# \; b! x# {turtles-own
" N7 p3 R& Y( O+ \3 R& d[. g  U9 @  J5 L# V3 ~
  speed     ;; the speed of the turtle0 b2 J, I( \# ^% U2 p
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
! a2 t0 F( R* I# ~/ ?/ ?  wait-time ;; the amount of time since the last time a turtle has moved
, a! |  D5 W, E]
5 b( W" h$ k3 f4 x
4 ~. l# @' b: Ypatches-own; |( v. u" x+ Z$ _
[
) A- n3 R4 |( c  intersection?   ;; true if the patch is at the intersection of two roads7 [& d6 X( v& e& O! @6 m
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.' I& |: J" p9 @5 w& H. L
                  ;; false for a non-intersection patches.& Q7 E; M3 M9 r) K' f
  my-row          ;; the row of the intersection counting from the upper left corner of the
# i2 S+ r( |( d- R: {                  ;; world.  -1 for non-intersection patches.
6 q* B7 @. _! F: \- ?: q  my-column       ;; the column of the intersection counting from the upper left corner of the+ y6 C) q* X  E
                  ;; world.  -1 for non-intersection patches.
1 h3 @6 Y( W$ o8 C7 _6 H  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
4 @' J& y8 D2 i! O# X  auto?           ;; whether or not this intersection will switch automatically.+ w5 q4 e5 `& [+ w. S. Q1 V
                  ;; false for non-intersection patches.
  ?3 q& V" d) B. @# p]* l$ ?  W0 @: g% t- E

. f7 G8 [- h% q' d+ W4 ?
' j( a8 T, Q, d3 h8 y;;;;;;;;;;;;;;;;;;;;;;' e2 X8 [" ^: C9 [6 }, V
;; Setup Procedures ;;4 R& t/ o$ J; Q5 h1 _) }* u( m
;;;;;;;;;;;;;;;;;;;;;;8 Q. P5 O3 J8 s" Q

, {" l) c& D" t+ N2 a/ B4 c;; Initialize the display by giving the global and patch variables initial values.* m. ^: L5 V4 |" L- m- L
;; Create num-cars of turtles if there are enough road patches for one turtle to; a. r8 `5 |. ~
;; be created per road patch. Set up the plots.& j% o3 Q4 A4 b0 O& G9 V, [5 S) x  y
to setup
+ d$ D+ ~8 q& O5 E; }  ca
. Y, G4 N, ?' V0 @0 L: D$ u% L  setup-globals8 D, B: h5 O) z. z; s
9 E' Q$ S. ^6 N# y
  ;; First we ask the patches to draw themselves and set up a few variables
9 `, O7 ^3 }1 x+ E/ [  setup-patches. K2 ~9 ^2 @& o. V& O
  make-current one-of intersections/ A7 m$ l. Y8 `$ `4 {9 s
  label-current6 E0 s1 V, h7 K/ B: B! z

4 R( u6 O, U3 G8 |  ?$ I/ Q. h8 I  set-default-shape turtles "car"8 l) K! l0 G, b- L( A/ u

) y: c3 Q- G/ p; g6 u  if (num-cars > count roads)
, m% r) O0 X& `% N- ?9 F1 ^+ f  [
8 g  {: x. y7 n$ h* T+ s    user-message (word "There are too many cars for the amount of "& U9 k1 H0 V7 h' I
                       "road.  Either increase the amount of roads "
5 R+ B- b3 }6 }6 w" t+ V                       "by increasing the GRID-SIZE-X or ", U. y6 a+ K; f# H: P$ f5 }
                       "GRID-SIZE-Y sliders, or decrease the "
5 s2 q% ]" ^& Z6 |9 l: I  G$ S1 l                       "number of cars by lowering the NUMBER slider.\n"
3 _& S# o" @- p                       "The setup has stopped.")7 z, `2 q5 X; g
    stop
& Q5 W5 P+ i, S  \+ F4 X  ]' j; {2 _" t5 `, S
: E$ v& o# ]$ h6 w; s- `- {1 p4 b; Z
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
! q  h* F4 N( U7 A/ i* x* o* r) i  crt num-cars3 u' [# n) [: E6 C+ U
  [7 A% K2 d  Q7 J) W0 B$ H
    setup-cars
" J- A* X- y) b9 r( ~6 w6 |    set-car-color
9 i; I! K' ^2 U0 Q4 ]    record-data
. z# P0 U  N4 g. v3 \! A( j  ]
, b9 N; V$ w) u9 g* V% j( U, r6 O8 G* N) @* w9 _
  ;; give the turtles an initial speed. L+ V  i; N: f$ w8 v0 ?* o
  ask turtles [ set-car-speed ]& I6 `# z& c& w$ P; _6 m$ C& s0 V" Z: E

4 _8 ~+ Z/ B1 k# n) ~7 B  reset-ticks3 |. ~# C, G& V8 x$ H) j
end8 _5 A+ z- X: C1 Z

- B0 N# F7 n& [+ L; U;; Initialize the global variables to appropriate values+ W+ @$ N1 B/ v: E1 f
to setup-globals/ O9 ?8 @, B* z4 ?" N
  set current-light nobody ;; just for now, since there are no lights yet! W/ d( r, A/ s- R: e3 A
  set phase 0
1 ~' ~- ?1 _# D6 b6 I9 p  set num-cars-stopped 08 X- H8 {) V( j/ Q7 H3 u! F9 I
  set grid-x-inc world-width / grid-size-x) j+ Q/ E- K7 s9 b+ t% h0 e
  set grid-y-inc world-height / grid-size-y
2 E0 A% f1 C5 B8 ?- U* `; I( j
4 S! u; V; z1 p- Z) A: T/ M  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary3 F1 X8 p6 n( g9 y
  set acceleration 0.099' E8 n( s6 x- T5 t
end8 z1 j/ T, u7 I

$ w7 l' h! |* f;; Make the patches have appropriate colors, set up the roads and intersections agentsets,5 @: d  F7 S) J' a2 P" i9 K( G
;; and initialize the traffic lights to one setting" z7 }, p% S4 G" n0 @/ ]
to setup-patches
& ~; m3 f! B" C3 c  ;; initialize the patch-owned variables and color the patches to a base-color
. I- k0 _, ?5 U& |3 i0 a/ V  ask patches4 K3 Q" {- T9 a% |: p" c7 s& `
  [
9 Y: a4 K; ~; i7 p9 H3 O$ C8 D8 j4 }& W    set intersection? false
# H. {! S! |: @4 J9 k" a    set auto? false
1 J2 N4 Z5 Z( E& r; M/ Q0 u- v    set green-light-up? true: N+ X+ _6 }. l# a+ Z/ l/ L
    set my-row -1
+ M+ v3 M$ z0 M$ s3 J0 f" a    set my-column -1
8 R* b; @2 k/ m* f4 I8 J* |    set my-phase -1  V- T# L: r+ ]3 l9 N3 [. \
    set pcolor brown + 3" S# n! x5 c0 O% u: n' g$ \+ F+ V- `
  ]
# s" m' Z! l0 r: A
% Q2 q7 w% j( i* N% N; B  ;; initialize the global variables that hold patch agentsets- F/ ^9 a3 x3 e# L! J8 Z
  set roads patches with3 {6 Z6 A& j) r, c9 J  I' M. ^2 n
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
% z$ m% ^) V6 Y/ u1 `0 z    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]8 K9 h, M3 \. E% U
  set intersections roads with- W6 j. H3 @; ?: c7 u$ J
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
7 Y" ~8 D$ a- X7 N    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
0 z+ Z7 K1 q  j& M/ [) J; @& {  B5 A- p* e8 U# Y* K/ t0 F2 u
  ask roads [ set pcolor white ]
0 Z6 O. C7 u4 y6 U    setup-intersections5 N1 Q! l: r% `: S- x- t2 r; [
end
. c1 I! M2 a' ]: f, w" u其中定义道路的句子,如下所示,是什么意思啊?
% z$ q9 H: \7 i, M: {. l set roads patches with- I5 z! _7 a* e
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
) k7 x- s2 J' U- f. ]5 J) w    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]$ f* P# d& f3 a3 o* X3 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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