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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。
) `- n3 G% h. J9 w0 Cnetlogo自带的social science--traffic grid这一例子当中,5 y$ t; z; a/ [( X
globals$ n( S8 C5 v# A* y6 S- }# a
[' ~* a6 Y8 X0 P$ W7 w  J* q
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
: }) V7 d) G* P" {- z4 I  grid-y-inc               ;; the amount of patches in between two roads in the y direction
8 \+ ^: H# H2 R: K, ?/ g  acceleration             ;; the constant that controls how much a car speeds up or slows down by if: g1 {6 j& E8 |2 s
                           ;; it is to accelerate or decelerate
# }; r! v7 C9 B6 j# A* H; [. ~  phase                    ;; keeps track of the phase
' c. P' q/ s3 w: ?* o  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
: r1 i1 N& N* R+ u! I- U3 X  current-light            ;; the currently selected light
( M: d% S4 O- k$ U; ^2 D$ R7 @* o; G0 m4 B
  ;; patch agentsets
- Y8 X0 L7 v# Z  intersections ;; agentset containing the patches that are intersections
4 ?/ n) J: H' W  roads         ;; agentset containing the patches that are roads
  [) u3 c& c% t/ Y# g' []0 y) T# [& A5 v) }! y0 M

- J! h2 W. _" tturtles-own# M; q2 l# ^0 V
[& I' j1 o! _! [
  speed     ;; the speed of the turtle
1 i* k% s! g$ L- d0 S0 C$ c* A( L  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
* x8 A) x7 l6 |% ?3 L  wait-time ;; the amount of time since the last time a turtle has moved/ c* I! [0 t4 r3 M' k5 ~0 V
]8 J0 G: @% n* l1 ^3 x

  {7 i# t% E( r% I7 z2 p) `patches-own6 {# j8 T6 R! U- R+ V$ p) x, _
[
. n- v3 x& p" J- I  intersection?   ;; true if the patch is at the intersection of two roads1 t9 i2 v% \; L$ d- R1 t2 r5 I
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
9 y' y  P- ^# v$ ]) l                  ;; false for a non-intersection patches.
/ ~9 ?4 F" i# h2 r. i4 Q4 X/ V% K  my-row          ;; the row of the intersection counting from the upper left corner of the' Y: m% @1 G# P* n3 N
                  ;; world.  -1 for non-intersection patches.1 K9 L+ N% K6 r  ^# g2 A7 q
  my-column       ;; the column of the intersection counting from the upper left corner of the
4 }/ R5 e! F& ~# ~                  ;; world.  -1 for non-intersection patches.* t6 y$ g/ f# N+ D
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
! u1 k1 z! S5 g  j9 l  auto?           ;; whether or not this intersection will switch automatically.1 Y9 G! F& X$ }3 @
                  ;; false for non-intersection patches.6 C  b2 [! ~0 ?' E0 J$ f6 i1 F6 T
]" s6 U; M% D9 E% ~

: m% s% a. S# @2 r% {' ?) U7 X
; f0 F! U; l& E7 s. ]$ r% z;;;;;;;;;;;;;;;;;;;;;;
; ?% K7 e( d2 o, p/ p;; Setup Procedures ;;; a8 ~5 ?0 j- d, C$ S
;;;;;;;;;;;;;;;;;;;;;;
* Q5 Z$ Q+ [7 }0 K5 c- s
2 V. U( q+ h2 O% r5 T# }: `;; Initialize the display by giving the global and patch variables initial values.
# h2 i2 k3 X" r  m' T2 E1 E% ?4 d;; Create num-cars of turtles if there are enough road patches for one turtle to
( L* m: k. `* S9 \$ I;; be created per road patch. Set up the plots.# M* _" M8 t* n% K. K
to setup3 \8 t; e* o! D/ d) @" p- i, y4 I
  ca
1 p2 b! m. X) ]  setup-globals& x# ?! [8 D  B5 x) v9 I8 @
& [4 ^  V# `2 x; n% M
  ;; First we ask the patches to draw themselves and set up a few variables
$ p% P& w; A* r) v% K0 V  setup-patches
: H, L' h+ K" W0 _; G- e' k8 `  make-current one-of intersections
+ W; x3 O9 ]* x+ k, M  label-current: Q7 N; x9 u* q
% _9 T; E  F0 y
  set-default-shape turtles "car"7 N) u$ @; ^  O4 y9 \
% Y* ~# p) {5 O' k! w
  if (num-cars > count roads)9 H/ M7 h% E% s
  [
8 d% ]1 p; `9 H4 T; a9 V! g    user-message (word "There are too many cars for the amount of "  J$ Z& Y0 s2 z/ m1 @
                       "road.  Either increase the amount of roads "
. d* J) J$ Z' v/ q; j8 ]6 B0 J. Q( b- U1 C                       "by increasing the GRID-SIZE-X or "2 u+ N7 E; k/ i3 V
                       "GRID-SIZE-Y sliders, or decrease the ": n1 S( T5 v; V: B/ L. z" v. l
                       "number of cars by lowering the NUMBER slider.\n"
7 f! D0 k- C2 i6 L9 G                       "The setup has stopped.")6 H1 [8 ~5 p2 N7 h
    stop1 s& D. D) w! W! i( N
  ]
$ y2 R8 W* Z6 k( O4 {: i! d
9 w+ ?! z) V8 j6 {9 u3 A4 B  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
. Y# j. P# y( s$ F  crt num-cars# b) f! j- M; I' s4 [, V/ r  B) X
  [0 H" {+ s9 ?) @6 ?) }
    setup-cars) C% j: H+ G' p  s: L
    set-car-color+ _8 j4 s, }2 f  o5 y* L5 r
    record-data# D( i7 ?) W( b
  ]
  G8 D5 I5 ~! q0 C" w; g# S1 J
: T$ F) j* {# p3 L1 s  B# O  ;; give the turtles an initial speed5 b1 g; K+ N, R3 S
  ask turtles [ set-car-speed ]& ?9 C0 R$ n5 O: T
, }+ W: b; \7 r8 n8 r
  reset-ticks
2 P# l/ @( c2 s1 C' c5 Uend
8 {0 E1 A" G4 }" L6 l3 f0 R: L
& Q3 W* G5 M2 J: M6 \, [+ @;; Initialize the global variables to appropriate values
# |# B' e8 }9 {to setup-globals
8 Y; [+ h1 \" k  set current-light nobody ;; just for now, since there are no lights yet
: I6 ~1 J; }  \5 B  set phase 0
8 V1 n( d# e) B% ^% [5 I9 C. B  set num-cars-stopped 0
' P7 @# L( c% b6 \  set grid-x-inc world-width / grid-size-x" M# X- N: w3 X  O3 g
  set grid-y-inc world-height / grid-size-y
% z% R: }$ X; ^0 o& }! [' W0 T3 I$ z1 K. l
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary, Z; z  R& C! d. y4 i7 u9 j
  set acceleration 0.0999 M  d' n/ r. @
end% Y: A- V& p8 @, x

/ G3 T! }, `# x0 Q/ G;; Make the patches have appropriate colors, set up the roads and intersections agentsets,; r5 d" T2 }( K$ r! l2 K9 |
;; and initialize the traffic lights to one setting
1 ?# T& y- z" o6 }; f, @3 Gto setup-patches. }0 H' C+ |5 Y* N9 l6 w- _( _1 p
  ;; initialize the patch-owned variables and color the patches to a base-color
/ v) a/ b. L1 R( t+ M- R8 P  ask patches7 O, k, \# g6 y5 J+ |+ s5 E
  [2 o  L. [! d( M
    set intersection? false
6 R: A" C+ g+ Q, M5 W: |    set auto? false
. N8 S7 g6 y% c+ ~9 r+ s    set green-light-up? true
, v0 x# b( H* V( v/ K6 P' e    set my-row -14 n3 y  ~$ g, ]
    set my-column -1
! I7 r8 l3 C1 M5 d) h7 C. Q0 O    set my-phase -1
$ D( Y" t) e4 s% h# [    set pcolor brown + 3. i6 @7 i: h$ C9 P
  ]
8 `+ a7 ^8 \' g: ?. g; J& H6 n  r- k# H) Q& n
  ;; initialize the global variables that hold patch agentsets4 M  |3 f7 b7 n/ c6 M" ?. ~
  set roads patches with$ W* I/ z$ \- ^! L. P7 H1 i" A
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or* \) J/ ~$ E; C7 r9 x' w5 |
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]" C  ]5 |& r9 g/ ]0 o
  set intersections roads with5 a* J( q8 n* j! h3 x- k, w3 m
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and# w* m) V* C, G
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]1 G" q% c- C6 o; s3 b0 Q
% f% K4 D6 [2 Q$ m/ I2 R) o; Z
  ask roads [ set pcolor white ]
6 h& ^; j: y. Z    setup-intersections
5 L7 G/ e9 v$ N( f5 I+ L# {- wend1 n! @0 K. |4 a6 P2 f! ~2 V
其中定义道路的句子,如下所示,是什么意思啊?( c! W8 a+ O% J
set roads patches with
* q+ |0 h3 H) ]2 G. s    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
" p# l& b) F6 R" v2 V2 ?, d& Q    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]/ O; g) {9 v2 i
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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