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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。
8 U1 O2 Y7 g* d' M, y2 Jnetlogo自带的social science--traffic grid这一例子当中,7 ?- ?8 U( J* y0 e
globals
3 g  t0 f4 r( f: D4 p[
$ v7 ?. S% F6 L+ ]  grid-x-inc               ;; the amount of patches in between two roads in the x direction3 e7 G9 l( J5 d% r4 o. b, d( e
  grid-y-inc               ;; the amount of patches in between two roads in the y direction6 `" _# {' D# \6 D  J! r
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if: W! k4 Y7 C0 Y0 q' p' U
                           ;; it is to accelerate or decelerate5 F: L7 g3 i% C3 I  ~
  phase                    ;; keeps track of the phase. n, A4 @) h) z0 i+ N6 p
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure  K# b* m4 c+ Y
  current-light            ;; the currently selected light
4 S! q! [  n+ Z2 B" s2 J; Z0 u" b# M6 |4 l9 C
  ;; patch agentsets
* [4 c' I3 s* d: V9 f1 Y' U  intersections ;; agentset containing the patches that are intersections
# }9 g0 `& K4 N6 R  roads         ;; agentset containing the patches that are roads: |# I& W, e; a# Z' Z
], i9 d# t- O+ d$ w% E* i

! }, k) b# V% B8 `turtles-own1 y. E1 X& s4 a
[" V9 f/ v% Q2 _: q
  speed     ;; the speed of the turtle1 K1 ?8 I- O1 W, z" c0 ?
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
" }4 x% c' G& a0 ^  wait-time ;; the amount of time since the last time a turtle has moved
* L) d7 p3 }: u+ v( E% H2 q# _]
# }6 p( D7 w% ^. Z- z0 ]1 S2 i
, h  ~) O# N; k, Upatches-own
8 z/ P/ h4 \0 U- k[
/ d( E' X  a, _$ ?  intersection?   ;; true if the patch is at the intersection of two roads7 X* r2 J1 @" E  G9 Y4 a% c
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
' k5 h7 ~6 x9 R9 G' m0 Y                  ;; false for a non-intersection patches./ M: g1 L& w' M& G8 f3 q# D/ d
  my-row          ;; the row of the intersection counting from the upper left corner of the
( m2 |" C4 t5 P7 C4 `) c; R                  ;; world.  -1 for non-intersection patches.
# h9 X) b& u. F) G. R$ ^, \! ^  my-column       ;; the column of the intersection counting from the upper left corner of the
4 d5 ~9 e1 ~$ N; E% Q- c                  ;; world.  -1 for non-intersection patches.
9 k% {8 q5 O6 @# J  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
! O. u# @) E* M, O( \  auto?           ;; whether or not this intersection will switch automatically.8 A$ i. x7 K0 Q' a* F
                  ;; false for non-intersection patches.: h; g/ c2 q; F, O& ~; n' m# A
]: p* X, U  k! o3 n
- h/ T" o" a' @/ C7 C

) }+ L+ s* f1 S6 }3 S  e$ J;;;;;;;;;;;;;;;;;;;;;;
2 I- I6 u* y- S! l, I/ H: ?;; Setup Procedures ;;1 N( @3 e' G) J# ?4 r
;;;;;;;;;;;;;;;;;;;;;;. F5 g  }* G& p6 R* f$ M
0 O, M0 J" u1 W8 J
;; Initialize the display by giving the global and patch variables initial values.
3 R" f( G' D3 y6 F$ V( Z" z;; Create num-cars of turtles if there are enough road patches for one turtle to
/ }) p5 M1 a; W;; be created per road patch. Set up the plots.: ^* ^" P) B% k( ]
to setup, G9 _9 y3 M% ^3 P6 M1 y! q
  ca
# O3 C( m! D8 Z5 E* i5 G  setup-globals' U2 y4 d2 [5 S  @" _

1 J' k8 D4 H: [2 x9 ]  ;; First we ask the patches to draw themselves and set up a few variables& Z: z2 Z1 _, i" B9 |9 C, ^
  setup-patches  s* e1 `+ s/ ^0 r
  make-current one-of intersections
8 M& l6 c0 ?3 w7 _7 y  I  label-current
/ `4 Y( n- L$ O, j: }
/ x( M# L4 W3 q9 G$ q7 N* K# [  set-default-shape turtles "car"# }( b+ e6 C/ H: b

" x" I' h  A8 a7 p2 _  if (num-cars > count roads). D1 N2 I1 A) ~/ z0 J4 {
  [  s& g! w9 t( L
    user-message (word "There are too many cars for the amount of "* S! a( \+ S. b2 l. K  z
                       "road.  Either increase the amount of roads "6 ^; R1 L5 D( n! _) V9 }
                       "by increasing the GRID-SIZE-X or "
4 g( s1 P2 u1 F' a& l                       "GRID-SIZE-Y sliders, or decrease the "
8 e/ i# _0 q3 F# Q$ @; i: T3 ?- O                       "number of cars by lowering the NUMBER slider.\n"
2 i8 {5 b, y+ Q                       "The setup has stopped.")- F9 I! d7 k6 @; x
    stop4 C" x  i  U+ m4 n" j% e" h
  ], c0 Z! c$ v- T$ P  F6 Y* n
/ V8 ~& o# _. c5 x6 [
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color  w# K+ b/ e% }) B+ G! A
  crt num-cars8 H7 m# u: T7 `5 X6 t
  [8 l8 L  G. ]( X* _  P2 F  l' B1 T7 i
    setup-cars
: A; G, b# U  g1 x: [( M8 m    set-car-color  x9 A" ?0 u' m7 e  [7 z
    record-data
# ?% X3 D4 }2 x  O0 ?( ~  ]
4 `1 t& k; c, U6 r/ X2 J' {! }# _% d; C. B+ C* J+ G
  ;; give the turtles an initial speed
' h4 B2 H$ |. q$ ^* X" E5 _  ask turtles [ set-car-speed ]8 \. S  U# q4 |: m% }' n* U

5 O% A/ N5 `5 b/ Z  reset-ticks
5 j+ r9 a2 k. Xend
7 }/ D/ i% E1 `( D! y
  J6 u" {- W$ k3 V8 K3 ~;; Initialize the global variables to appropriate values8 K+ T" R4 {) J. v2 c) I1 T
to setup-globals
- a2 x3 b- @2 o- J) L2 u) R& i- R  set current-light nobody ;; just for now, since there are no lights yet
6 t; o. n  m* o* g  set phase 0: v) K" q' \  {  a9 h3 d
  set num-cars-stopped 0+ U* E7 \6 g. r# Y2 ^- f* k7 v
  set grid-x-inc world-width / grid-size-x& j& n# g, T5 A7 N7 G- \
  set grid-y-inc world-height / grid-size-y$ P4 F! m* D4 V* f

( i/ B& b- a) P1 Y* m: W6 A9 k  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
( ]) n# o9 D; r+ l$ x  set acceleration 0.099- C/ m# R% F" o3 i- T
end& z- q6 d# c0 ^- e
, X# U& {- g$ p" x; r6 F# x/ W" P
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,/ B4 H* a- @; R) k! f% _, m
;; and initialize the traffic lights to one setting
+ D& B9 ^1 W- N* ^. g* B$ Ito setup-patches; D( V0 M1 ]. x5 o% |
  ;; initialize the patch-owned variables and color the patches to a base-color. u, b7 x2 d8 d1 j* ?
  ask patches1 ~6 E. J+ x9 y
  [% m$ e$ _8 @9 I/ {$ ~- r4 e
    set intersection? false
2 `7 w: B6 M1 }- A* r    set auto? false& _, z) k+ T! w$ k/ E
    set green-light-up? true7 L8 w& q+ U+ n
    set my-row -1- w1 N3 E0 O# _# A$ z
    set my-column -19 j2 P# u+ G0 z. b# R
    set my-phase -1
+ y. Y" s" `" d) s% R2 B2 ^    set pcolor brown + 3
" Y+ M. g9 }! i+ i* j  ]
7 @8 c- ~6 o6 h# F5 L  D
, Q( S- q4 B1 C4 {' E  ;; initialize the global variables that hold patch agentsets
* k4 j1 D% ~+ Q: \: Q) y  set roads patches with4 C% Y; p+ K/ r8 o3 T* B
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or. {; [# u3 z+ U- ?% F* W8 n3 q
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
' F8 P. ]5 D. q: v! l. P  set intersections roads with
; @4 {1 S, j2 M" d5 I$ E5 D    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and3 ?1 i" n- B! _9 f0 I: |7 H# l" T
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]) k# l+ G$ k) a! H* {( \
- i/ u: `( o5 H) T
  ask roads [ set pcolor white ]
& x' o, w2 H; r4 v3 G2 |: N    setup-intersections* m7 w; F$ v* B) |! l/ W5 \
end
: ]* p. M  b! c2 A: I% y- y其中定义道路的句子,如下所示,是什么意思啊?, ?9 i# b/ G1 _$ S
set roads patches with8 N" i0 |& T; c9 g( l
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or0 E! v" O7 ^4 J5 ]$ T& u% `
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
1 e- G& l- h3 v9 f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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