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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 ]. m+ w) N& _4 Fnetlogo自带的social science--traffic grid这一例子当中,- P; ?% C! P/ a' Z+ I; r
globals7 Q/ p5 D, e7 w  `# g. D
[
* q$ e# ]2 H8 ?% \% s/ p  grid-x-inc               ;; the amount of patches in between two roads in the x direction
; k( ]( R; r, m  y  j! z- z  grid-y-inc               ;; the amount of patches in between two roads in the y direction- T) K( B& d6 M% D- R( e
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
% g# h+ X/ j4 l& R' N4 t! s* X! a7 a                           ;; it is to accelerate or decelerate+ `/ [, E! K6 H# G
  phase                    ;; keeps track of the phase
' k7 H  t  h$ t, [* C* p  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure  x! F. t: j" T5 b. [
  current-light            ;; the currently selected light0 q  k' j, A9 E  [" u) M

! _% i& k' a% k, i) b/ ?  ;; patch agentsets6 H; v; B& R: W) D! a3 l
  intersections ;; agentset containing the patches that are intersections
2 z& k  |1 d; U  roads         ;; agentset containing the patches that are roads
3 s4 B# {& k- O& C. D]
7 _! M; A7 V( C1 u# Y7 u0 I) j0 M) s( @8 c/ u) S
turtles-own
! y) T- _) ]4 Y3 w[4 P: H! f/ ]8 a. U0 Y1 h3 T: u
  speed     ;; the speed of the turtle7 \& [5 ], N' E6 z% m2 J
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
7 b7 y/ k8 G, z! o1 M: Q' L  wait-time ;; the amount of time since the last time a turtle has moved7 A' I8 r2 }1 U/ d0 r. |
]+ E& S1 L# v6 G; K! M1 w* P2 Y& _
& ]$ j$ D3 ?# x
patches-own
8 d: ~  v9 m% H[  }1 g+ h& p3 }- v: |) F
  intersection?   ;; true if the patch is at the intersection of two roads2 A+ U! s4 i+ E' t" R3 H0 [
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.3 g7 @0 E0 s! O5 m* F# p0 V9 W) {- l" l
                  ;; false for a non-intersection patches.4 G' I% u5 n- q+ u& Y! [2 Q, w
  my-row          ;; the row of the intersection counting from the upper left corner of the4 e% z+ ?( b$ u3 ~* d5 @
                  ;; world.  -1 for non-intersection patches.
1 v' q( V# r) l, ?# e  my-column       ;; the column of the intersection counting from the upper left corner of the
, N: \+ k" }- P6 z& x                  ;; world.  -1 for non-intersection patches.
5 s  z. v% o0 l/ p! Q: O& ]$ v. q6 W0 @  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
; e! ~$ `4 t6 D. K, G  auto?           ;; whether or not this intersection will switch automatically.3 F* ]. C! a$ S" K3 e
                  ;; false for non-intersection patches.
; A8 T" h! I0 O- S]
, Q* v; i& x9 K" b7 j4 A! z! {; u1 r/ B0 o" }

& G6 \$ @9 \% ?;;;;;;;;;;;;;;;;;;;;;;
) `2 t1 x/ W" q5 Q+ m- {! b1 e, f;; Setup Procedures ;;9 |/ o- X4 ]8 c; F+ j" U% W
;;;;;;;;;;;;;;;;;;;;;;8 e4 A1 _, j, X: n; _+ P

- S) X8 c( k7 F;; Initialize the display by giving the global and patch variables initial values.
' m5 l5 g* z0 X) ~, C;; Create num-cars of turtles if there are enough road patches for one turtle to( ^, x0 O4 M* A4 h; ?
;; be created per road patch. Set up the plots.1 Z# M3 T3 P6 [: i
to setup
9 o4 G* G7 p0 y/ q+ ~- o* a' m' ]# h  ca
8 S6 F6 p2 j& o# v* J  setup-globals
; U* W( O& x0 `' U) p8 O  m
1 j* `7 G, X+ y  ;; First we ask the patches to draw themselves and set up a few variables
: i& {0 x* E. I( \) E$ f  setup-patches* ]" M6 U0 {! g+ a1 i
  make-current one-of intersections
/ }; @+ J8 b" Q# \: U  label-current: A4 K; t$ u, U4 n$ G- W: c1 L' S
& B7 ]/ ?: ~  \1 s0 m
  set-default-shape turtles "car"
3 p6 @1 P8 ~. X& s' v: m2 u5 m9 s7 d* a) ~
  if (num-cars > count roads)( R# e+ t$ |. _/ q# Y6 }
  [
8 r9 \; l( ?8 j3 S    user-message (word "There are too many cars for the amount of "
1 f+ b. j7 |* r1 V$ ~                       "road.  Either increase the amount of roads "
' x2 H5 P" b& H& b: p/ g& ^                       "by increasing the GRID-SIZE-X or "
/ r% t. ~' }+ u: R3 `                       "GRID-SIZE-Y sliders, or decrease the "
/ Z( t5 a, i0 z+ x! N% o                       "number of cars by lowering the NUMBER slider.\n"
7 }% t# m7 {  [                       "The setup has stopped.")2 ?. C9 f3 N$ U' ]! _  w& [# ^
    stop
9 j" W" v- V# Z7 p2 ?  ]/ {1 p+ Z* D& L9 J& Z

3 o/ H$ [, V6 K  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
7 w0 ?# K+ v& W' Z1 v( e( z  crt num-cars; Q. ]1 N* l+ m5 x8 L
  [' I  ^) v8 Z- L7 T) q
    setup-cars
" b2 x' H3 F" }, l1 P7 y    set-car-color
1 t  {2 V" M( G! [" `    record-data- s, l# b: a3 @6 i
  ]
# ]8 T1 J4 L- o0 a$ ~  }$ Z2 g3 G# I; S% q0 _) g
  ;; give the turtles an initial speed- D5 e/ a5 d: O4 P: H' [4 F/ k8 ]( e
  ask turtles [ set-car-speed ]* N& g- D. H: R' u9 E
. l; n2 T5 B- S. y7 c- s( C, N
  reset-ticks: z0 m! n* T) u( L  N* ^) B
end
$ ^; G( Q& h1 ]" Q  d/ [. z6 @3 m- z0 ?2 R
;; Initialize the global variables to appropriate values2 z' C- q1 S. `2 j+ N
to setup-globals' t5 M5 a3 A  v0 ?: }% a  f+ D( J
  set current-light nobody ;; just for now, since there are no lights yet  ]+ L, |8 D+ v* t3 {2 p3 ~5 j3 G
  set phase 0
$ j# R1 |: S0 c# v2 `6 v8 ?  set num-cars-stopped 0
" N4 }% x7 o% V  set grid-x-inc world-width / grid-size-x
" B: r: h( g$ q: o3 S6 a0 |  set grid-y-inc world-height / grid-size-y# G( \. x. R9 e3 A+ }$ ?
  x8 F) ]- j* Z  M$ v, @
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
! e5 d4 L: g/ H  set acceleration 0.0999 b. W* O3 Y, C# K
end
% {& F0 l1 F' Z1 \! y) F5 N
+ j: A9 D3 B) ]7 D  w;; Make the patches have appropriate colors, set up the roads and intersections agentsets,* R# \& @  [% J7 A  C1 ~5 }
;; and initialize the traffic lights to one setting
. F- i$ a3 u( e. r$ y! Q8 {to setup-patches
! F1 S- v* ?  }9 n( h/ B2 j  ;; initialize the patch-owned variables and color the patches to a base-color
* t4 m6 v; @# {) A0 M# k( d, t  ask patches6 `8 V2 n! @9 L, }
  [8 k9 `( Y8 C* q' e+ a' g/ \0 p
    set intersection? false+ M( \$ l$ o* W- T, F
    set auto? false& l  `8 E+ \% v  }+ s
    set green-light-up? true
  X0 F  W( L3 K' o5 v4 v    set my-row -1
  @) |6 ]) c9 |3 N1 P  d    set my-column -1
# j0 P/ [' X) t' u1 P+ W    set my-phase -1
7 `. j' D. q8 e/ ?% g( r    set pcolor brown + 3
7 r) ]( h9 B& m& `) z% F8 ?! X  ]
: s9 E2 F* K8 a3 X$ F& u& l7 |/ m' e3 N5 Y
  ;; initialize the global variables that hold patch agentsets# D9 u3 w" B- D8 i
  set roads patches with) g  h2 l! I; J3 X8 |
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or2 g% s* C0 m- S2 a5 ~  \6 a6 `4 v! i5 J
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]* G" u3 h" j9 T1 S
  set intersections roads with' i) `6 z# u5 l% O; o+ E2 l
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and! y9 z/ y# b3 w8 g0 v
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
9 T, {0 |' ]6 E2 G: U  ~3 }0 X# \8 T, J# f/ h
  ask roads [ set pcolor white ]
' ^1 N9 X2 W$ ^8 Z    setup-intersections2 c& w. G( u4 X, f
end
7 e! \! W: j- j- n  G, ?% j9 [其中定义道路的句子,如下所示,是什么意思啊?6 e/ T8 w) l0 \- w8 r
set roads patches with, Z6 P2 h0 X/ A5 ^/ D
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or" V7 w! B' x/ }9 Q- k: P" T) V: m
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]  ~/ i/ ~& e6 j) X6 [
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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