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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。
2 q+ s/ c* @8 ?6 f- W# [* Nnetlogo自带的social science--traffic grid这一例子当中,
- E4 n) V' V% C3 G9 Xglobals  b+ b; \) B' b8 u3 y
[
- @' U2 Y7 |: |- y* U0 H  grid-x-inc               ;; the amount of patches in between two roads in the x direction# ?0 t) r5 R6 B( c# Y! D, _
  grid-y-inc               ;; the amount of patches in between two roads in the y direction  Y# i5 N. n6 u. q; ^. N5 H
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if6 o3 K  q5 e" K8 O+ R5 r" |: X9 U
                           ;; it is to accelerate or decelerate
0 D+ D9 f3 ?8 A3 i) v1 K9 z  phase                    ;; keeps track of the phase4 {$ m9 Q  F) c! u7 S" m! a. J
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
& y* q5 x7 x! G% r' K8 M7 u  current-light            ;; the currently selected light
* \2 c" f; z( j# W) t" ]2 q
% o" `5 H, {; f" g0 P8 o0 \8 Z# W. Y  ;; patch agentsets  g0 `1 O2 u% j
  intersections ;; agentset containing the patches that are intersections
5 H  M2 ]1 n8 @2 @) d  R  roads         ;; agentset containing the patches that are roads
6 C* G, Q" t' y# S6 J) b]
) V6 R0 @: n- C: s
- K0 C2 E* G0 K* V9 a2 P' ~turtles-own* ~9 j8 C, V+ o0 P, b
[9 ]; B5 e' {. I
  speed     ;; the speed of the turtle* Z4 S9 C5 e+ G6 y. [) r! F
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right8 B8 w& _+ ~8 {  R7 i8 \
  wait-time ;; the amount of time since the last time a turtle has moved9 c* ]3 |. E" T+ d8 W
]
* f$ ^! ]6 G' {
7 L6 P: v, L+ S! ^" Ppatches-own; I. _; C  w/ p5 O3 t4 ^# p  J. R
[
' B* Y  I* r' q6 H1 c' a  intersection?   ;; true if the patch is at the intersection of two roads0 N0 X1 ~6 C; G8 x
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.8 H8 t  }8 |; L! N0 D
                  ;; false for a non-intersection patches.
, t  Y& o5 ?" M% P# h  my-row          ;; the row of the intersection counting from the upper left corner of the
" d! H1 u/ g6 W% o, F2 C, ~                  ;; world.  -1 for non-intersection patches.
9 \2 ^/ M! q4 U, T  my-column       ;; the column of the intersection counting from the upper left corner of the
) x$ \+ \* S) B4 D* U. |                  ;; world.  -1 for non-intersection patches.
, k. |& I4 O! r$ E7 b1 Q2 X  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.8 }9 {- F" O% ?. B! o; j
  auto?           ;; whether or not this intersection will switch automatically.
7 `$ ?* d6 N% v+ f4 u0 l3 j5 G                  ;; false for non-intersection patches.
; O! p$ p' ^( R0 q" W]1 X9 K8 m/ L* i$ W4 \

7 K: X" W; f& a5 j: Z4 d7 e2 v5 C5 v, h( y4 ^* k. N6 z
;;;;;;;;;;;;;;;;;;;;;;# d; _/ h, h- o3 W1 j4 q
;; Setup Procedures ;;
. r1 S* ~7 p2 U* O6 ~;;;;;;;;;;;;;;;;;;;;;;/ M9 L# I# l5 Y/ V( x# J1 {) [
4 q9 m) C+ n" N7 `. y6 \6 b9 h
;; Initialize the display by giving the global and patch variables initial values.$ Y4 d5 w6 c9 [2 h4 z9 J# i
;; Create num-cars of turtles if there are enough road patches for one turtle to2 P$ L& W- d9 o% a  w3 `- r/ r
;; be created per road patch. Set up the plots.
0 F7 ?$ v& I( A% wto setup! @+ a! H2 M0 v8 E. y) g% E
  ca0 e# U4 Y4 D: c/ P4 f
  setup-globals
; M7 I8 [! |; V
! H6 S0 U, |5 V% ]# a& `  ;; First we ask the patches to draw themselves and set up a few variables7 U: e5 n' |8 V
  setup-patches% Z" P$ P0 r& }1 v+ W
  make-current one-of intersections
( F1 _# G+ G! F6 [1 _$ `, f  G: `  label-current
) ^7 m2 i0 _' h( g; |1 C9 l8 Q( N2 P8 O& ^) ?1 Z7 T
  set-default-shape turtles "car"
6 A5 I2 d; m9 L9 `6 |
! z8 D5 L7 S# }3 R' |  if (num-cars > count roads)2 S$ Q+ x' }1 R& D' n- K/ o3 L
  [
, K8 a- U: _* E2 K    user-message (word "There are too many cars for the amount of "
3 N0 Q  o' j  F$ ~, D                       "road.  Either increase the amount of roads "& Z+ z" i5 e* M& ]: k( s! H! x  e
                       "by increasing the GRID-SIZE-X or "
( }- G9 Q  ]+ z. x. _0 f8 h; Q                       "GRID-SIZE-Y sliders, or decrease the "( z/ M  D4 C- e+ v: s' _
                       "number of cars by lowering the NUMBER slider.\n"
7 h& i% v! _, p* i' @! O% T: F, A                       "The setup has stopped.")
' O8 j, |- l, H1 @( f0 s3 {1 @    stop
8 [+ L$ e9 r+ e* ]$ [& G; X  ]' |; z5 _) W# W6 F6 B" Q3 M/ w' Q8 {

5 Z' W: E6 q" P! C/ t  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
/ |3 c2 D% P+ U! a% X3 r  crt num-cars- O  |  L/ z$ a, P  P* O. \
  [. H) `/ S! R" c4 I$ ^' C- c
    setup-cars' p1 O' n; g  u6 m
    set-car-color
: \) {! N4 B# b% h7 x    record-data+ D, c' S8 `' t; _1 b3 U
  ]
' F$ Q' U6 S5 a# [# c" h. I* G- J" n1 x9 X3 l
  ;; give the turtles an initial speed7 r( O, ]/ |; {* `
  ask turtles [ set-car-speed ]
  m7 C- ^! v# s9 D, H8 i) N' x
: ^& L! k$ h) u- J, Y- g4 W  reset-ticks& ^" \" q; @% n/ d
end
: `4 z+ ?- c$ W/ p4 S. c: _: k" Z. I6 ^
;; Initialize the global variables to appropriate values, C/ ?9 g! v# l# M+ }! b9 p$ _
to setup-globals# R( L: O' o5 c/ X
  set current-light nobody ;; just for now, since there are no lights yet4 M  ], L8 L  A( ]0 g( q7 g" y  a* x7 J
  set phase 0% u. _  o3 R$ ?- z5 @; {( r
  set num-cars-stopped 09 P! X+ S* T' u# p
  set grid-x-inc world-width / grid-size-x: _7 F/ t6 M* B" ?" k
  set grid-y-inc world-height / grid-size-y; R6 H# D6 D  l0 q9 s; z) [' ?1 ~5 G
+ m5 Q5 e& L! X8 x: h
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary2 d: y9 k5 I! M
  set acceleration 0.099
! N; S; e5 q+ `; \9 C# K/ gend
/ e) g4 D) L" y
3 [! Z* D8 j8 f3 i8 M  z" Z8 ?;; Make the patches have appropriate colors, set up the roads and intersections agentsets,2 w) T8 T5 J, s; p
;; and initialize the traffic lights to one setting4 e2 ?7 X; Q- t- b0 ]
to setup-patches3 ?5 c& v$ i  w
  ;; initialize the patch-owned variables and color the patches to a base-color
4 u( q: O5 V/ t( h9 l  @' r4 W  ask patches) J8 Z9 a; ^/ [, N4 e; F- R% t0 h
  [: B6 o- F! T- v9 W- S( N
    set intersection? false
2 T$ [; Q) T2 {9 c: P    set auto? false: v1 a% R$ @# Z" s3 S8 x
    set green-light-up? true
  |/ q: l/ p; L* ?: `; Y    set my-row -19 h) \2 j0 d$ L5 X/ N4 M* ]
    set my-column -1
& m$ ]6 J! O; b" o$ S    set my-phase -1
  q; [+ f% f8 O1 X/ x2 C; \8 H    set pcolor brown + 3. k, E4 N; E' |; K& Q) W4 Y* d
  ]
; G2 d$ L+ {8 ^9 O  W. r! C+ y+ M+ l4 }) H; M* o  @
  ;; initialize the global variables that hold patch agentsets
, J8 J* w  q! _( l  set roads patches with
- a/ W/ v7 Y/ c; ~0 N9 v8 Z    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or; l; X( ?. g. O1 ]
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]- Y$ f( u) n7 k- l5 j  W
  set intersections roads with
- Y$ A, K+ s' h. x, g3 @' S    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and% n4 O  X! g# m& {9 u
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
: G) A9 Z7 E* v" C0 z  i5 {- b' ]4 r
# j' P2 {% p7 N: l. n  ask roads [ set pcolor white ]
, G: }9 C1 M2 _: n/ B* z* x+ I    setup-intersections  E6 M0 ]) U, W4 ?$ l
end
6 U0 u) E& f2 m1 H4 q1 X& C其中定义道路的句子,如下所示,是什么意思啊?
1 Q4 p0 m! U* g1 A$ ~& s set roads patches with
2 _5 \7 z+ G. l! r7 M% u: H  {+ G/ o" F    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
5 o4 c& P' w- _! O  d    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]4 \/ z" O) t6 I1 v' S% ]
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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