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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 M) ^$ q+ U( S! }+ G  wnetlogo自带的social science--traffic grid这一例子当中,
' F7 }3 q( O& Wglobals* A. H& D6 V+ w$ w0 p' w6 U
[, ~6 [! X, Z( R. l6 \) j3 d+ @/ z
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
( R9 @, N- [" C4 s. I  grid-y-inc               ;; the amount of patches in between two roads in the y direction+ t- u0 r& T, P* r( ^4 A. Y
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if) O2 n/ ^- U3 \" U! m
                           ;; it is to accelerate or decelerate
7 L/ N0 H+ y5 g& ~1 `3 m# G5 [6 V  phase                    ;; keeps track of the phase3 l8 C- a- g$ \1 r# ?" \
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
3 k: X' T7 W9 ~$ I0 o  current-light            ;; the currently selected light
9 y0 t1 Y2 [* R" F2 i7 ^( u6 h& C5 C# ~( B' S) o- {, G/ A
  ;; patch agentsets
$ v3 Q6 Y& S7 x# m# c  intersections ;; agentset containing the patches that are intersections# h. L2 p* q% h3 W+ P( J
  roads         ;; agentset containing the patches that are roads1 P0 z/ Y2 ~. k" M5 B. N6 b
]
& m5 c  O, W' ^8 }& H
- p$ S+ S1 [- v. M7 Eturtles-own
' q6 Q- o9 s" s2 s+ A[9 U; s- I* m% q9 }) O
  speed     ;; the speed of the turtle. f  F" O  d" \' Z  J. d
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
8 o) z" u! z, V+ A  wait-time ;; the amount of time since the last time a turtle has moved8 F+ }5 C( e! ~: q& [
]. x8 F3 F% f' H: o( ]9 G2 B

6 J* s+ u/ B# G; u3 d6 l4 bpatches-own* u5 B0 i( q! g3 w
[) z4 l: a8 s% |, s
  intersection?   ;; true if the patch is at the intersection of two roads5 O' B$ L6 E5 b$ l2 N" ^  |2 A
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
1 Y1 J* W# E$ G3 S* m6 r                  ;; false for a non-intersection patches.
5 {& z% ^' }# T) @+ [2 S# Z4 h  my-row          ;; the row of the intersection counting from the upper left corner of the0 E5 S8 s/ a+ U8 [( t
                  ;; world.  -1 for non-intersection patches.
) @8 h- N6 ~" H' f) M  my-column       ;; the column of the intersection counting from the upper left corner of the$ {0 R; r( v) ~1 S/ n5 C9 o/ E: U
                  ;; world.  -1 for non-intersection patches.( M$ `% X* x3 e3 F
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.7 Q2 T  C7 h% X3 L
  auto?           ;; whether or not this intersection will switch automatically.8 A' R6 F) Y* u
                  ;; false for non-intersection patches.  p1 I* l' x) \# ~# V
]
  w$ s/ P/ ^; ~1 c
: t4 ~0 C" c0 a3 ^( t4 L+ i  D1 r" [; T, t. e- [1 U( ]
;;;;;;;;;;;;;;;;;;;;;;' q; I. D7 Q3 q2 ~; }. H; R
;; Setup Procedures ;;9 q: _% ~2 g" @8 T: B
;;;;;;;;;;;;;;;;;;;;;;
: r  C2 L% @3 E( z  M
$ |! d  \# v& |7 a; J& K( `;; Initialize the display by giving the global and patch variables initial values.
: S( Q& @0 I0 k- p+ K! T5 o7 N0 C;; Create num-cars of turtles if there are enough road patches for one turtle to
. M0 l* \0 _; O$ T* V;; be created per road patch. Set up the plots.
6 a1 k5 c! t, ?! v0 |; l4 hto setup
; c0 O( l+ A+ }; l1 M  ca
) g+ k# {( {  v  setup-globals
' i+ M, N, s% m, t" E, I  E( S' X% ^; W0 `0 a6 k# ~! j
  ;; First we ask the patches to draw themselves and set up a few variables, S# m7 e: U7 B& e$ S: ?
  setup-patches
+ Z1 d# b! |' k  make-current one-of intersections
1 ]7 N1 ~+ S& l1 ]7 h  label-current; T. h+ F4 Y" @$ h
/ n3 J0 g" z, ?- k
  set-default-shape turtles "car"! a+ A- k3 \; Q+ n
; n0 A3 ]# m6 }
  if (num-cars > count roads)
7 w5 N6 b5 G" Q/ c  f2 B; k1 v  [! u) U8 n6 C0 Y/ I+ u4 _, V
    user-message (word "There are too many cars for the amount of "" _1 ~5 C) |' d2 H9 A
                       "road.  Either increase the amount of roads "
: C, L; W$ Q9 Y' l) v                       "by increasing the GRID-SIZE-X or "
( W( u% x: w1 S  x                       "GRID-SIZE-Y sliders, or decrease the "
% z% H1 P" a; `+ R0 f& c                       "number of cars by lowering the NUMBER slider.\n"
' ~3 t# T/ Y0 W                       "The setup has stopped.")
2 t0 @7 V9 d2 h: Z    stop
. o( T: C9 X$ C( ?  ]0 |& `# E6 V# u& ^7 C2 L- h
5 m3 Z: W5 R9 L0 v
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color  m" B; G; o( _1 h$ ^# R
  crt num-cars0 p0 ~6 m7 Q. R1 X* K
  [# @" o' |1 k# i
    setup-cars. ^2 H+ I# v+ ~+ n5 l% `
    set-car-color
$ i5 Y# O5 @2 Y7 W5 F/ y% |    record-data; k1 B- `+ N5 _* v
  ]( v  D  y. m! K1 P; a
( u& ~3 @. a4 ~& G) o
  ;; give the turtles an initial speed
& L' ^9 b3 N+ x  ask turtles [ set-car-speed ]
$ B/ U- i1 Q; X$ b9 H0 X) D9 \1 z( h
  reset-ticks, k& H& N  f' h) v7 H$ u4 T/ g
end; w7 x+ v4 n! p- c% F

& ~1 P' I# o6 w, E* q  ~) G0 {; w;; Initialize the global variables to appropriate values
/ ]% }+ S# v: U) Cto setup-globals* O9 g4 ~/ K: w& g
  set current-light nobody ;; just for now, since there are no lights yet
1 `- i% Q7 Z$ N: [! X  set phase 01 H* x, z* ^3 K0 A+ ~8 R
  set num-cars-stopped 0+ S# j, ]2 k6 d8 A: T6 r6 y/ ]9 P1 X0 k
  set grid-x-inc world-width / grid-size-x: g: L: G. H* g! Y0 A/ a
  set grid-y-inc world-height / grid-size-y
- X4 P) _' |. l
* c3 y, t& b6 j: Y5 I" ]- c  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary, _+ n' t$ d7 @( C9 ?. m
  set acceleration 0.099
* d5 k% \2 F7 k0 Hend
$ ?# t) ~! ~$ r7 v" J
, H  k  Q/ r& g& ]' |) a5 E;; Make the patches have appropriate colors, set up the roads and intersections agentsets,; [  a# e2 K0 h+ L; [
;; and initialize the traffic lights to one setting
8 [- y' M! }; x9 }# v% a2 Uto setup-patches" ~% h, k" z4 G! M- s( F# G
  ;; initialize the patch-owned variables and color the patches to a base-color
  ~2 Z& S0 L8 o" ^2 }, ?' J# @- Y  ask patches7 A/ D/ T; h- ^4 [0 j0 j, U
  [
" a3 D; }, d. B0 |2 Z: b    set intersection? false
* E7 q( U2 M* D. x    set auto? false
# v9 V$ C- p$ N, @! q1 h$ n    set green-light-up? true
! G) z/ L3 L2 j( j    set my-row -1& O9 m4 L9 A" X9 ^! w
    set my-column -1
7 r' M9 T1 d4 P( }2 J, g    set my-phase -1
: Z4 u. E; e" g- q: E    set pcolor brown + 3
" X8 e) f; Y+ p2 S  ]
5 L  k7 j' P* p6 A0 l4 T* q! p5 M, n: Y  c! d1 Y8 ?
  ;; initialize the global variables that hold patch agentsets
4 o# ], O& A) ^: _  set roads patches with9 h& `% R; v) q6 A
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or( p! Y6 l: E8 F$ l5 G
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]2 y, Q+ V. l: K$ L7 g
  set intersections roads with
  p+ ~) C9 x) B    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and. Y7 K6 S/ P3 b2 E5 I, A
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]5 S3 e) v9 ?, x: N2 T: ^  r

* F/ J4 m2 n  o  ask roads [ set pcolor white ]7 I. t# b8 ?% G# s
    setup-intersections8 p, F! p+ e* w: g
end
; v, \+ f0 c+ G5 I1 a: l其中定义道路的句子,如下所示,是什么意思啊?) J; p, d8 \1 N4 ~9 R
set roads patches with
$ H* `* o- A9 h    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or- g: p9 L# v3 L. w: {4 K5 o
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
7 Z& m! o0 O, @; x! D& A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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