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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。
3 K* A1 e( q! h1 {1 N1 k2 cnetlogo自带的social science--traffic grid这一例子当中,' ]0 N  F# R! d
globals
* W. D' n" h! z9 {[4 r0 V9 C! V6 u* m
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
  q  O. N9 l0 I# W7 G/ ]1 i/ b  grid-y-inc               ;; the amount of patches in between two roads in the y direction
) V" l  F4 Y3 O/ U  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
' M, i' i5 C% F* J" b. f7 U                           ;; it is to accelerate or decelerate9 I2 M) C" ~6 T. W% p* z# B
  phase                    ;; keeps track of the phase$ Y* o3 Q7 V$ F: q& O$ O2 @1 D
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure1 V* S4 D2 F8 O: A6 [
  current-light            ;; the currently selected light- U8 M8 \) v7 B3 Z  H
( `/ Q" C* V0 r6 ~6 t# ]/ M
  ;; patch agentsets# i  D5 w/ R* F5 i" o2 s' R
  intersections ;; agentset containing the patches that are intersections
4 p4 ?, d3 M; H: ?* D3 m( V3 L  roads         ;; agentset containing the patches that are roads. v' _" d  h- K$ H. S( \! Y: N
]
8 w# S& [+ o, w4 F9 |8 O+ }0 g+ o
: |0 J, r4 y8 mturtles-own9 Y7 K: Z6 Q5 y  ]
[
# ^+ I$ s: m& A: `* O" F  v' G  speed     ;; the speed of the turtle
: g- y* N: a; ?: T- r2 ]9 O  up-car?   ;; true if the turtle moves downwards and false if it moves to the right# J6 ~& H3 i8 Q
  wait-time ;; the amount of time since the last time a turtle has moved9 X& u: a9 a' m1 |3 h5 Q' P; g5 H
]
$ J; H* P% M. P. \" v' p" F8 ]
6 \9 r: ^1 ?; V/ o  U* |" Vpatches-own
/ @/ D3 v/ r& C# Z/ h+ h[
* A7 A% k) O* ]* L! A  intersection?   ;; true if the patch is at the intersection of two roads# m# v7 F& B0 \# `' h9 j. H
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
+ T7 E" T( Q, E  s( O3 H: p                  ;; false for a non-intersection patches.
9 s4 K% s; Q0 x3 |  my-row          ;; the row of the intersection counting from the upper left corner of the
4 \0 z9 n6 N- z/ i                  ;; world.  -1 for non-intersection patches.
( Z% _, X7 `/ L4 F4 ?: ^  my-column       ;; the column of the intersection counting from the upper left corner of the
! S; E" k1 u" b, d0 k                  ;; world.  -1 for non-intersection patches.
- L9 l, X* Y* F3 m- m  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
. o' a( W, B( {  auto?           ;; whether or not this intersection will switch automatically.! q& p- P% q& r$ i
                  ;; false for non-intersection patches.
! y, K$ x) z7 Q6 {7 h7 A]8 q" b. R# I7 z$ V

/ w, T# }5 `5 s0 Q
3 z& g. [9 @# M: R3 ~1 r;;;;;;;;;;;;;;;;;;;;;;1 P+ q+ a* Y2 j! \' f0 V! {
;; Setup Procedures ;;1 Y5 j+ N9 N" T6 J. [
;;;;;;;;;;;;;;;;;;;;;;2 j: ]  j+ q7 Z- _9 M$ V1 v/ m

: O. e$ y' A0 i1 P3 B) f;; Initialize the display by giving the global and patch variables initial values.( U# C/ A3 {5 E1 c8 R  ]6 K! M
;; Create num-cars of turtles if there are enough road patches for one turtle to
+ ?8 r5 _" m# T% `;; be created per road patch. Set up the plots., r7 D9 I' d2 ]2 y0 g
to setup, K7 m  i9 `* K( y8 {% e
  ca
* ^' S1 f& s7 c, V) `  setup-globals) }% t5 @. t& ?( _8 x4 _( [

7 Y! q1 _& D& ~, p& _  ;; First we ask the patches to draw themselves and set up a few variables  W" T# t: A! B* W2 p$ w
  setup-patches$ H, x3 @8 C- o5 i3 {) y
  make-current one-of intersections
. t( H" K6 U# S  g  label-current
. w) {5 k  ~" A) f/ d
% V0 h+ K0 |2 A  set-default-shape turtles "car"
- P* X' `" V+ e. A1 E) I2 D" g7 Q8 |. u4 a0 o- g
  if (num-cars > count roads)
: P! k- H0 ~: P" C  [# p; N5 s4 |( t: t7 J3 y
    user-message (word "There are too many cars for the amount of "0 q1 Z7 J, Q; U" I% Q
                       "road.  Either increase the amount of roads "# B! @9 J) b: R
                       "by increasing the GRID-SIZE-X or "3 O, T2 s( X/ l0 i! {! I
                       "GRID-SIZE-Y sliders, or decrease the "
$ l1 f  M! ~7 q                       "number of cars by lowering the NUMBER slider.\n"% H3 {/ q+ ?% y4 q( j4 ^, j7 \1 |
                       "The setup has stopped.")
$ K: E" Z$ Z9 {    stop2 r5 n  V5 S, m/ M* @
  ]2 X0 R/ q7 ?' p2 b" P& h) m. x
  g0 z( C  Z: C9 \" L9 o9 h
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
) H, n) K9 ~+ ?% l9 R  W- Y  crt num-cars$ t, c4 K1 P$ l; b) k, r
  [0 Y9 W7 Y& Y5 p; p. F5 B4 ~
    setup-cars8 u8 _: b4 m0 Y! R
    set-car-color& ]  W* p1 X, f9 ]
    record-data
% g3 j" j: X" f6 S  ]
8 [; O# r7 @2 ?3 v* ^8 Q3 s7 N/ k2 n  {) i8 b1 c) |  e
  ;; give the turtles an initial speed
6 U' k; g. ^6 D, F  ask turtles [ set-car-speed ]) K5 {& w) {8 E5 M
- j* S# P4 d4 B( x- W- V% |
  reset-ticks0 r( }$ w5 D$ C  Y  G3 K" }( s
end
3 v( V3 J) a" J0 \* c' B7 w; c! [) y: T; H
;; Initialize the global variables to appropriate values8 B$ Z2 Q- f4 Z7 J. ~7 S+ }
to setup-globals, ^% x$ ]+ Y1 |+ V& o" H5 A5 M
  set current-light nobody ;; just for now, since there are no lights yet
( w0 ^, U, {1 p  set phase 0
* B) y# ~0 a3 r; ]: c  set num-cars-stopped 0- U* |- H( O* ~5 Q; S, `7 P* u
  set grid-x-inc world-width / grid-size-x/ M0 O8 d* A$ e3 Q- @4 e+ m
  set grid-y-inc world-height / grid-size-y! W  q9 H6 n4 u
3 D# F& f* H8 g+ E- r9 H/ L! o% J
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
! t$ V3 e5 l5 i4 Z+ D! X  set acceleration 0.0995 }7 u2 _' f1 b6 d$ W
end
# |. X( H$ J- n4 H( U: }: C! t9 I' J  l$ v6 Y$ k  \0 C# n7 O
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,& A/ A+ r' e) {2 T3 w! b; r, N
;; and initialize the traffic lights to one setting
/ A8 m+ F& i! A  m5 `to setup-patches
6 H% G1 ~1 D  p' a0 ?6 b$ z  ;; initialize the patch-owned variables and color the patches to a base-color
, Y3 \' S" B# C! `7 g8 c) F  ask patches  N, @0 G7 T0 d" L
  [0 F8 \# b& l) J  q
    set intersection? false9 U, m# Z8 h9 C$ \" Q  \
    set auto? false
& ?5 @( w7 N. Z5 f5 l4 x+ y    set green-light-up? true1 U* y4 p  I! ~& `# q; W1 }
    set my-row -1# I0 o, v4 Y9 f: k% O* o# i
    set my-column -1' t8 [" j: r) g8 R# T- D: p
    set my-phase -1; M5 G) g. H! w3 K5 k0 K: M
    set pcolor brown + 35 g8 x) p6 q$ m' p9 g7 X6 Y8 w
  ]
$ C% P5 ^0 ~# V5 ~4 p; c( I+ W) M9 |6 i0 L- ]2 l/ a
  ;; initialize the global variables that hold patch agentsets
3 m$ o! y! [+ v, a& \; y  set roads patches with; y" q; F9 O  z/ g  F% c* I" F! Z
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or% Z) `2 h9 _2 B9 [  B& A2 T' S( V: x
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]8 j# A. E, P- c
  set intersections roads with* Q7 C- F0 ]* G% R/ n* B1 u3 \
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and/ @6 R$ V) {/ }3 L
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]2 Z9 m9 l3 d- U# p. k- \3 c
- L  f: A: D* M4 S
  ask roads [ set pcolor white ]& _8 b7 `3 G4 j5 i7 S& P/ C5 ?9 {
    setup-intersections
7 m7 R, h  {+ D5 p+ \end
. r% f" n$ S; _+ A% o/ @& _* p0 h其中定义道路的句子,如下所示,是什么意思啊?
9 F$ X, F  j1 G7 n( x/ p  ^; j set roads patches with- A6 W/ M& l6 B9 o1 `) d' H
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or: U5 X  X+ B" F" g2 N' t
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
. o, i) t! r5 g; f& R7 r. P) q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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