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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 f3 d+ \1 K  d' m# T& |
netlogo自带的social science--traffic grid这一例子当中,
+ g5 b5 Y. S- s- P' y& F/ z% zglobals
# M- R' X6 c; @1 \3 ~, |[
0 q2 Q! f0 |% T, y$ _; k8 J1 z  grid-x-inc               ;; the amount of patches in between two roads in the x direction- x9 M+ W0 s2 ]
  grid-y-inc               ;; the amount of patches in between two roads in the y direction
. E* P4 \! W2 G2 V* ]  acceleration             ;; the constant that controls how much a car speeds up or slows down by if) ?) |6 X4 x) V# J9 e' M; d; t5 N
                           ;; it is to accelerate or decelerate
6 [: V7 J4 g9 i" A  phase                    ;; keeps track of the phase0 E$ i1 c3 h% z  F" e
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
6 h2 T( U* q- @9 z  current-light            ;; the currently selected light0 i. a6 {- m* Y- r# n# a
  s9 C6 y7 M) M1 ^( P
  ;; patch agentsets! H0 _$ e5 w; }$ U) B( X/ u9 R. R4 b
  intersections ;; agentset containing the patches that are intersections( b& n1 ~5 v( z  d, y" J
  roads         ;; agentset containing the patches that are roads* b6 }) W3 V& ^/ p4 l5 u6 P& t
]
# {# E. N( b0 E- S3 q. O, V. G) Q9 p' }
turtles-own
4 B4 ~* |! D7 q# w' P; b[
  k5 |, G8 Q+ N3 V  p+ U$ U  speed     ;; the speed of the turtle( ^8 y7 O0 a2 U& S& _9 y  k
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right$ c' v  w+ }" h0 i0 J8 D' S& K
  wait-time ;; the amount of time since the last time a turtle has moved* g4 |6 d4 T# N1 }  z9 }
]. t/ @8 _+ y  G5 d& u5 G9 A% X. x
7 `% ~- l7 h4 _3 t* k
patches-own
  |, p+ O, T- B3 l3 |[
  J1 {  H, c9 h6 }# _/ h  intersection?   ;; true if the patch is at the intersection of two roads
& W' X+ `! F3 O1 @  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.; r/ x1 d- |% G* q8 z
                  ;; false for a non-intersection patches.# C5 h" G* Y1 ]2 m2 \
  my-row          ;; the row of the intersection counting from the upper left corner of the
- L- j" Y3 J9 F. o) p( R5 G/ R                  ;; world.  -1 for non-intersection patches.# w* z1 g3 R) w( Q% w  R
  my-column       ;; the column of the intersection counting from the upper left corner of the
; t3 ~5 r- |. \, L5 ]/ p  d% H                  ;; world.  -1 for non-intersection patches.9 r; j( N9 D7 @7 @3 O: f
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
2 c' w- [  E  ]; t. a, O  auto?           ;; whether or not this intersection will switch automatically.1 k% K$ g8 D: a) a( e3 C/ U
                  ;; false for non-intersection patches., N" t" \8 P# Q
]% p/ t- e* `- L9 s& J7 b9 B0 M

2 h1 X1 i6 p3 m) F, g4 R/ Y
6 d5 g+ G" n* S1 j$ };;;;;;;;;;;;;;;;;;;;;;
& u* [* r. i7 S;; Setup Procedures ;;/ u* x( u) p1 G% t# i, b
;;;;;;;;;;;;;;;;;;;;;;
+ \) v; P: B8 z8 ?* y8 e) T
7 F$ f, b3 s6 N. B' m1 y;; Initialize the display by giving the global and patch variables initial values.
* {2 p2 q$ y: v;; Create num-cars of turtles if there are enough road patches for one turtle to8 T' I1 x) U* g$ }$ b) z2 w; i5 B! r6 {3 e
;; be created per road patch. Set up the plots.
* D! \0 K! i! O' W% \to setup" y( J* f* j1 ~
  ca
4 F  s1 P2 V" s% C  setup-globals
" ^7 @" {- u" P. \7 x' O) I$ b# [/ C% B
  ;; First we ask the patches to draw themselves and set up a few variables
" k& o3 f- ]1 R) T1 S' d0 a7 U  setup-patches: c9 v- r3 |7 g0 s/ C/ C
  make-current one-of intersections) Y- ^' D4 S, e! _0 \; O, i- ?
  label-current
6 N8 e9 N; i/ z: ?. h. k
7 f+ `5 a2 I: [, B6 ?  set-default-shape turtles "car"( l* z% Q" X) W9 \9 t5 B! S% u  X. E

9 [8 ]0 e# [" r" z' B, d4 t  if (num-cars > count roads)
4 _" ^6 `+ B( Q4 A+ X2 L  [
* O# t) K6 Y* `6 W    user-message (word "There are too many cars for the amount of "
7 m# N3 ]9 I8 `                       "road.  Either increase the amount of roads "
0 E8 S& P; b- ~* W/ w0 n                       "by increasing the GRID-SIZE-X or "! u: s0 d  O3 a7 f( L
                       "GRID-SIZE-Y sliders, or decrease the "
6 F5 j6 a3 Y8 ^. n% @$ L! d                       "number of cars by lowering the NUMBER slider.\n"/ n1 v% p8 \! `4 A
                       "The setup has stopped.")
' X: \9 ~% L1 I    stop, @8 a4 c% K1 s9 @& g( y6 e1 Y
  ]
# Z! [8 Q5 l9 y& c+ F( E
( n  C  @4 G/ H2 l/ q  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
9 x, g( W4 d6 O, c  X8 G  crt num-cars
, z- ~& A; W/ k4 V7 m# P4 o& z  [) ?8 R4 e; }6 J' y$ j5 V: A2 O
    setup-cars! X' M8 R$ _. s- j. |6 k
    set-car-color3 @! m2 E) F8 H6 p) F+ ^
    record-data
3 C$ Q! V1 B" W7 g1 M  h4 K% Y  ]
( p- @! D! n* g5 z0 o! J
4 X* \% ?9 r# ~9 n1 j  ;; give the turtles an initial speed
) D. X5 y0 D* P* Z0 Y6 E" u  ask turtles [ set-car-speed ]
- ^( `# C; v) F* b1 {  b  t. V: Y! C
5 g0 f5 S  c8 N  reset-ticks
. a+ X* g( f# l$ o6 F5 Iend
/ n( d% E6 o6 t
% N% u: ^6 H, ]* r;; Initialize the global variables to appropriate values
3 Y% E. y' Y; W6 ]' X6 `9 O6 @to setup-globals
6 y; N) W' ]6 p  set current-light nobody ;; just for now, since there are no lights yet% T6 b- H. v  G6 n
  set phase 0
  H2 \* a0 J2 }$ ~* S$ m6 w  set num-cars-stopped 0
0 P4 g2 q2 d# X5 D  set grid-x-inc world-width / grid-size-x: ~2 r' N8 |+ n. A
  set grid-y-inc world-height / grid-size-y9 h1 ~4 K$ b7 I& |' i1 n

9 |3 m; r& X0 P$ k  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary7 [' K1 Q- |6 Z
  set acceleration 0.099- M$ \, @; b2 Y3 Q8 I
end
' ^1 d* @, Z' M
  H' ~" X" R( E* a;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
% q" d6 N9 }$ [- O* G2 j% J  D3 g' o;; and initialize the traffic lights to one setting" g5 z" T( j( D/ e0 _; l; ?7 J
to setup-patches
0 K' F5 T; V% I  ;; initialize the patch-owned variables and color the patches to a base-color
5 w; e, |+ C% z0 i. H) L' R  v- t% |4 L  ask patches
; ]& t3 w$ s( L# A5 I# Z, W  [4 c- L' K3 t; p
    set intersection? false
% s( r3 m0 D+ v$ W' B" d+ c  k7 d    set auto? false! x9 Y, |) X  Q+ M& o
    set green-light-up? true
& n0 j4 j1 ]5 K0 g' ]2 t, B. t    set my-row -1
8 x- ]' }) p2 p7 v8 |/ g    set my-column -1# g$ ]; o& M% W* _
    set my-phase -1
0 v* f7 s" i1 X4 e4 P- a2 |! P. o    set pcolor brown + 3% {1 q# K! t% {! G
  ]; L, _5 m( r6 v. r
0 y6 Q: `0 ]" ~2 q' k* s
  ;; initialize the global variables that hold patch agentsets0 N& A) D: w6 u9 R2 O0 V
  set roads patches with: D; e/ L# C- r' g
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
0 n) S) s  A8 V7 t0 G6 u/ ^. q    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
! \4 {3 G' s( b* U; _  set intersections roads with( e# }5 |0 W& M
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and- D$ q9 u; j) ~* p* h
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
; ]4 |/ R# j0 y0 \
# ?5 |5 R- Q# ]6 Q' u" C  ask roads [ set pcolor white ]9 m  M& u5 n3 K# ~2 Q1 p! b
    setup-intersections! g. _9 T1 i# ?$ F# ~' S1 `+ {2 @4 F+ s
end
, P2 a' R2 C) t$ Q# Z其中定义道路的句子,如下所示,是什么意思啊?
6 P  r& _+ S" g set roads patches with1 F, O1 |% b6 u
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
/ `3 ?2 a! j& m1 I4 @    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]- h- ~3 c3 T/ u0 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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