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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。% q( x8 Q. {; W; _1 ~8 R
netlogo自带的social science--traffic grid这一例子当中,
& b4 n6 d2 |# C( i. V) oglobals
. e/ i- ~7 [3 {  n  S[0 i7 K$ G) Q/ a1 A& K
  grid-x-inc               ;; the amount of patches in between two roads in the x direction7 V' d" C* Q* C+ m
  grid-y-inc               ;; the amount of patches in between two roads in the y direction
5 ]1 R  W7 y$ h" \  acceleration             ;; the constant that controls how much a car speeds up or slows down by if4 L. n* n4 k8 f0 J! f
                           ;; it is to accelerate or decelerate
: D- ~" K9 `/ n% l* F/ u5 ^  phase                    ;; keeps track of the phase' y$ c: ^7 g* W; S6 F- O- F$ [* \+ t
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
+ A3 \! g9 ?/ A- l, ]6 @4 H+ E  current-light            ;; the currently selected light; @! `9 R4 ?( C/ r# Z6 j; R
+ t9 N( C, w- g  e, A
  ;; patch agentsets2 C7 ]  R3 L# @: y  C
  intersections ;; agentset containing the patches that are intersections! C( w3 E2 q& ?
  roads         ;; agentset containing the patches that are roads
% _0 ]5 p8 B! `: v]
: `4 H  @: i) [9 u5 H# j- E, y0 U2 R3 w5 g6 _& _$ ?
turtles-own: A* {. p5 K" {$ L5 w
[
  W- s  I( V$ G5 P/ _0 ?6 e  speed     ;; the speed of the turtle0 Q+ U; ^8 C+ [
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
8 w" r. {8 p- c4 F5 _4 O3 [  wait-time ;; the amount of time since the last time a turtle has moved1 W9 M# Z9 K) x! _7 u, h
]* p5 J# {2 A. [. E# h' x! F

+ \1 T$ c: |: O# M: j3 T: Ipatches-own* _8 i$ X2 w/ n. N2 \6 c
[% h5 D" N; T  n3 u
  intersection?   ;; true if the patch is at the intersection of two roads
' k; m* P! G! F4 P& w/ Z7 H2 w  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.+ _1 ~: m: M4 g. h
                  ;; false for a non-intersection patches.
& b( j2 v5 m1 p. \1 |/ m* Q3 \  my-row          ;; the row of the intersection counting from the upper left corner of the
; C4 }: {4 ~: D4 z7 |                  ;; world.  -1 for non-intersection patches.
/ }3 V0 G! d6 L$ R( a" x  my-column       ;; the column of the intersection counting from the upper left corner of the. p+ L4 z% c8 u: Z' j3 ?) ^7 M
                  ;; world.  -1 for non-intersection patches.
$ e6 E1 `9 L  s: F7 s6 |  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
1 B1 i+ I  b' c$ g* H  auto?           ;; whether or not this intersection will switch automatically.
: o" g3 r8 _6 Y3 J$ o8 @                  ;; false for non-intersection patches.- M4 T( Z3 A0 R6 ~" F( L* z7 b
], c; Q  O0 M; s+ q* o

9 [: I5 x& i8 o( k& E5 g2 q* L6 S& d- g/ `9 D
;;;;;;;;;;;;;;;;;;;;;;
3 m: P1 ?& ]8 O! [;; Setup Procedures ;;1 ~; d: i! g$ G% `7 a
;;;;;;;;;;;;;;;;;;;;;;
$ M, i2 P& L8 j) E! k! o
5 Y* m6 H( @4 E0 C! ~; s% \;; Initialize the display by giving the global and patch variables initial values.
5 l: M3 ^% y; S;; Create num-cars of turtles if there are enough road patches for one turtle to3 x) u( F- E6 ^1 D5 E! N1 O
;; be created per road patch. Set up the plots.9 `5 @. Q- o+ G
to setup% h9 J. J5 j0 k
  ca6 Z7 _, J" w2 o. ?
  setup-globals
& ~0 }, }1 \/ d, `1 G& B" q4 T- C3 H" x; }: f, ^7 Y
  ;; First we ask the patches to draw themselves and set up a few variables% k5 G7 R& G( i
  setup-patches6 ^2 w" ?* y5 x5 a
  make-current one-of intersections4 O6 x/ ~/ U( A8 w! E
  label-current
! `* g$ J2 W' R+ Z- A9 y
- i0 O) B3 T( P  set-default-shape turtles "car"
& V! ?4 W  {) T" ^2 C8 x8 k$ r2 D+ t  n
  if (num-cars > count roads)8 h$ {) m' a5 r
  [
/ N# L0 u& ^& q: k. B0 Q    user-message (word "There are too many cars for the amount of "
6 x( m/ J& j0 H6 G$ \3 ^% Q/ j                       "road.  Either increase the amount of roads "5 x5 D; X5 w6 D+ E& F3 x& W# r
                       "by increasing the GRID-SIZE-X or ". ^& U& F9 j$ g; x- _! O" V- J9 w
                       "GRID-SIZE-Y sliders, or decrease the "5 r( M5 s: A) p; U3 `: l5 c
                       "number of cars by lowering the NUMBER slider.\n"
/ _2 r' s9 S! P! U4 [                       "The setup has stopped.")
) [! w0 `. R( c    stop
6 P: f7 E6 R2 |8 U9 G1 z% B% P  ]
0 F- `/ Z1 _8 y, V1 ^  F3 f4 i* V% x+ J- U+ r
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color3 C5 X/ [. j+ N1 h  F
  crt num-cars- v/ d6 U6 }$ L/ e( i4 D& m
  [
' b( J2 W0 x* T3 {  |6 {    setup-cars5 K  C& O/ V' h/ A- a6 x& {6 {8 y( g1 U
    set-car-color
/ s6 e) m5 T& B8 K. q/ Z7 H1 r    record-data3 g( y4 H! \6 T9 o8 O
  ]  T) R6 \: E$ B5 m
6 E4 L! l% |* l: ~" D+ l- U1 {
  ;; give the turtles an initial speed& L! N! T  }7 o6 n4 e3 \6 o
  ask turtles [ set-car-speed ]
* b$ _% m& b5 Z
/ G6 j& m; v; O! F% T8 F  reset-ticks
* o5 G( J. Z$ y; x0 Pend
( y4 U& A) o: m& i9 L7 D  ~) f& R4 ?. s" i6 F8 M
;; Initialize the global variables to appropriate values# B. B4 j" P" D* f
to setup-globals
6 @: g8 \" T3 d/ `. p; M- N  set current-light nobody ;; just for now, since there are no lights yet
9 c: x8 C( s3 t5 ]9 r* I  set phase 01 s. ~/ v( f- @) n& T8 E( t9 Y+ w
  set num-cars-stopped 0
% ~, l  }# d+ s8 s. ^8 |; V5 \  set grid-x-inc world-width / grid-size-x3 T5 l, d# o- g  \& s
  set grid-y-inc world-height / grid-size-y
! O4 d1 b* v) ^4 ?  c$ `
% Q: v( v1 v) V+ ]5 u8 r' `: ?" E  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary- u' a$ V4 H/ R; i4 k' i
  set acceleration 0.099
5 M! }  P. F( z9 G; W& T9 cend& c' U4 ?! I' _  [9 `1 `% R3 M

6 _: f7 Z, Z. y5 g0 f;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
* L# N# p. T4 U/ U& p;; and initialize the traffic lights to one setting
5 p5 M* M' J8 O. ]  D' Jto setup-patches5 h- c' [4 S3 K1 g. a' V
  ;; initialize the patch-owned variables and color the patches to a base-color( \# G5 R4 k' {3 _
  ask patches2 F2 P# @. t  V2 W3 H$ S8 v& f
  [
. h- j) ?- o& x+ k, x/ n    set intersection? false* W) u8 y# }, i& M* e* e8 G8 H! a
    set auto? false
9 }2 T; T5 ]7 Z* }* I( R    set green-light-up? true
6 B: f; Z% i1 [. R' O    set my-row -1
! d8 p$ ]6 w4 H6 @) G    set my-column -1  Q1 j' @) k$ b5 s% R; L' H
    set my-phase -13 ?) `/ O) t% i
    set pcolor brown + 35 o( P$ I/ B/ ]+ p4 I# m0 A, ^
  ]2 B4 H) r, ]5 v
2 \% q% X1 l: I  \% q
  ;; initialize the global variables that hold patch agentsets  L; x" z2 {! e8 x: s" l. Y. e
  set roads patches with2 r( v/ @7 T+ e/ i% D3 {7 c9 j
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or5 `& E6 M/ k% T2 N# ^& F. A8 T+ \
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
6 c* c) l% r' g% f# t$ c* ~3 e  set intersections roads with/ c, ]4 _; W5 ^; K+ `' s) V7 \  K# b
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and8 R7 {4 g6 M2 K
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
+ R* Q4 M' u/ ]' C) q0 W3 {( L& X7 ?
  ask roads [ set pcolor white ]
, Q: X0 \4 Z3 P$ V% e- t    setup-intersections- G' t7 G& L: y
end
& \. ~% z) O9 p8 P+ @5 u! h其中定义道路的句子,如下所示,是什么意思啊?
) T, J, |( p2 `% o set roads patches with
  f# V- ~2 n2 v- }# Z" K8 j/ m    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or# E  p2 T9 @9 A2 t4 _& Z+ W# e4 v
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]" ]. l- i* Q! r9 p; u, H
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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