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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。
  m$ m+ i6 t, z2 }- ]netlogo自带的social science--traffic grid这一例子当中,* n! j2 A; b$ \7 U
globals6 ?$ O$ v/ s( f: U7 j& U; _
[* {) l) @3 O: j7 q  \2 Z; K3 x1 i
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
# V' G3 ], `# S2 z  grid-y-inc               ;; the amount of patches in between two roads in the y direction" u( F) T  @& ?! o. G
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
9 J' `: q  o+ M% u6 s                           ;; it is to accelerate or decelerate
) y6 l, y; [0 V  phase                    ;; keeps track of the phase/ O( D5 L* x7 E) ^3 `; d
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
* Y9 m3 R9 |" a% |  current-light            ;; the currently selected light
0 J* C* ~& @5 w
- K; f* N6 V; f4 a- P+ M  ;; patch agentsets
+ g2 `5 D7 Q  {5 G$ m  intersections ;; agentset containing the patches that are intersections
# A2 U; U8 }( P% Z. B$ r1 |9 B8 E  roads         ;; agentset containing the patches that are roads
7 C' R+ V0 h# U) l+ p]1 {% A, l0 s5 p8 f  v
9 S" N2 R8 H# ?
turtles-own3 a9 J& ?) |; e' p! H. i: O3 S7 T
[
( a% V2 z8 z* C  speed     ;; the speed of the turtle2 a( B2 Y9 L( g: G* B
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
8 a' ~* i( X9 J  wait-time ;; the amount of time since the last time a turtle has moved+ B# F  B( c3 k$ N
]
' E  h# {0 }. K4 b
# l3 a$ }0 `: `- T( y) t( \$ mpatches-own
0 I/ H/ ]  ^4 \& I[
$ r, h* i5 Q' @+ _$ H  intersection?   ;; true if the patch is at the intersection of two roads; C0 h, C( ~4 X! L- }
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.7 O8 w5 I8 P: g* A" w/ s7 U
                  ;; false for a non-intersection patches.4 O  M+ a/ u) a8 I# a
  my-row          ;; the row of the intersection counting from the upper left corner of the
& |4 Q4 b- ]& w) Z  m                  ;; world.  -1 for non-intersection patches.
" A7 m8 n* [8 ^. T  my-column       ;; the column of the intersection counting from the upper left corner of the
8 t1 [0 M2 E3 X, e* T& j/ K# z                  ;; world.  -1 for non-intersection patches.: ~" K9 T% A2 M( _
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.9 _  b# P7 Z+ [0 [
  auto?           ;; whether or not this intersection will switch automatically.
+ r2 C6 V$ V: B; Y2 S6 I                  ;; false for non-intersection patches.
6 K* l( K1 S1 N' k]& ?6 Y, e9 p* g" z/ c! Z

: Y$ s5 x4 N" L% c8 Q( W, i  t, `; s% w
;;;;;;;;;;;;;;;;;;;;;;1 G; ~2 u% t6 F
;; Setup Procedures ;;6 L6 Q+ p8 r  d- q
;;;;;;;;;;;;;;;;;;;;;;* L6 K# u. ?" j
! [4 @- K2 {5 F' O- k8 E
;; Initialize the display by giving the global and patch variables initial values.
- J3 z) O& w  y6 X5 Q" K;; Create num-cars of turtles if there are enough road patches for one turtle to: @! v$ d6 `% n$ s
;; be created per road patch. Set up the plots.
8 Z1 o; R  O. w3 j& Y3 _6 wto setup2 M, S2 Y  j4 w/ w3 W- O  l
  ca
8 p# W5 d4 g+ Q2 u3 M  setup-globals4 S+ [7 t- @$ U, f) _" y$ P4 n

" T1 v, D; G& F% v9 `; x  ;; First we ask the patches to draw themselves and set up a few variables
, G' V: |9 F- r. T  setup-patches" d+ H6 n4 T: b4 a6 V& w* h
  make-current one-of intersections& f/ k5 Y) c8 I. H# k, R, P) y! g6 e+ d
  label-current, B4 w" A/ M) x& R

3 k/ h. k! X/ d1 v9 L5 S  set-default-shape turtles "car"' E, x" w0 h7 b0 Y: N* ^6 o; m4 x

9 e! [4 {5 ]0 B  if (num-cars > count roads)9 t! H4 ?6 y" `
  [
, t! L; |8 y$ n8 }    user-message (word "There are too many cars for the amount of "
  x+ y" n$ I0 W- Q                       "road.  Either increase the amount of roads "1 k% A. R; e& j7 l# [
                       "by increasing the GRID-SIZE-X or "
: M- ^) ?1 S( G) E                       "GRID-SIZE-Y sliders, or decrease the "$ ~, |5 N& F! A% K4 t
                       "number of cars by lowering the NUMBER slider.\n"
0 [4 c. h0 ^% _; U7 I                       "The setup has stopped.")
: d4 H, _% n7 i, ?. k+ f    stop6 W; A* \( z9 f, P) o9 `: k
  ]* B$ H7 K7 S5 }! ^% S3 j
: G# @6 }6 V: b9 ]/ q
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
& q8 [9 R; }* n& E9 m  V  crt num-cars3 y$ G# R& C0 u  _+ W- s: B
  [$ m( ]7 e- B* [
    setup-cars
: S: X( Y  w7 @) J2 U1 b4 N    set-car-color
# Y1 D7 H: j& q& c' K1 H, |5 l) j    record-data
+ ~. P2 G( S: n  ]
0 I' ]. r+ d4 s) M* p7 G5 r6 C5 h: u, N3 }9 e" g! r  @
  ;; give the turtles an initial speed
& e0 r" J2 m- a; _, Z+ T# Q/ a! \  ask turtles [ set-car-speed ]
3 F' j& N5 g$ y% Z7 z1 u/ I/ N9 P$ E4 }$ d
  reset-ticks
  k! H" y6 f" U& ~9 n) _1 m6 send7 w, }; n+ e0 \3 i+ W/ g1 J. m

- @, g+ \3 [; _3 `+ I# y;; Initialize the global variables to appropriate values
  }4 X/ i% k9 A# o1 B, n5 _to setup-globals( c0 I. m5 X2 P5 f
  set current-light nobody ;; just for now, since there are no lights yet2 I) D0 ?- U/ s4 P6 D
  set phase 0
! F, T4 _% P) L. V/ D  set num-cars-stopped 07 }. ?' Q$ }3 C6 `
  set grid-x-inc world-width / grid-size-x
) x, i8 @+ r2 B; h* F; G  set grid-y-inc world-height / grid-size-y( q6 k1 f: y( ^- r3 G
) y' p' w; B. R& P- ^
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
! Y% |/ U& e1 X  set acceleration 0.099
6 t. S8 T( X  h0 {- N8 Gend
+ S& U5 R; R4 D- N4 E3 }- U2 }9 {: `+ y- R+ i, U
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
. ?, S, T+ ^& g6 K8 R;; and initialize the traffic lights to one setting
& [. s, _8 G9 n! {. J. M# fto setup-patches
( J( S: ?) X! h  j$ z  ;; initialize the patch-owned variables and color the patches to a base-color( w- R3 ^  W0 p, M( Y- l' X' K% I
  ask patches; K) t  z7 b/ w$ ]# s0 n* H1 l
  [
2 G- ~, O* {. J5 p0 L: \    set intersection? false/ t5 ~. C- Z4 F) H7 k6 m& i
    set auto? false
6 o( z8 g& k% M; C* q! A( G3 F% E    set green-light-up? true4 @% k: g7 s7 b' q6 R
    set my-row -1# F' ^/ x' o/ p) G
    set my-column -1
- H; M4 p# C- X. @' W7 c" q( o9 u! B    set my-phase -1
8 E! k0 g) `. q, P% P6 r    set pcolor brown + 37 d+ q1 Z, C$ Y
  ]  S8 W- I2 Q, \) C: F
9 \. A5 i6 S' O8 p( o
  ;; initialize the global variables that hold patch agentsets& D4 n/ P( }  [7 W# I
  set roads patches with
  |) f% f$ a0 X" [$ t0 X    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or. L! p* {) \% g( H
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
' k5 X% I0 \2 l6 k  set intersections roads with7 m% I9 e2 Q3 J- q
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
- q; `+ g, E& `% ~6 b: F    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]3 P2 A! G# Y: U0 k) l

7 @9 {/ F3 k# w2 x8 X* m  ask roads [ set pcolor white ]& y% B' P0 S7 F; {
    setup-intersections
3 \0 J5 ?1 N+ |! `* I8 ?, mend
0 e% q( U3 [$ V" D( x9 C8 B其中定义道路的句子,如下所示,是什么意思啊?& y  ]* ?) n. x1 _9 d
set roads patches with
: P; c' A! w% v& j' q    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or' q- ?0 t& C4 k- x- T
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]0 E4 w6 a% s( @# S" v9 O- N/ D
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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