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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。
; k6 v& W2 R8 Enetlogo自带的social science--traffic grid这一例子当中,
/ d/ ^' a+ @2 g& eglobals
' J. [" m7 Y; `/ A' m[
" @! A- ~7 W' u; J  E- @  grid-x-inc               ;; the amount of patches in between two roads in the x direction
% f1 \! j1 N) G% B7 @* \0 ~  grid-y-inc               ;; the amount of patches in between two roads in the y direction1 j' N: l: k. K' z3 l" v0 ]
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
9 ?/ f' d3 U/ h( }                           ;; it is to accelerate or decelerate
( v1 Y: k* l$ p9 Q6 @1 O  phase                    ;; keeps track of the phase. [( S7 w, V$ o. s( G+ E* L/ K! Y
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
7 T5 Z: ?/ Y* f+ W% a  current-light            ;; the currently selected light3 v$ d2 U$ Y7 z8 W: B
7 O2 E5 W9 ]9 U! x, M" M$ G
  ;; patch agentsets
, @6 u3 i! O/ |  intersections ;; agentset containing the patches that are intersections
- n6 b& s9 x  d) J  roads         ;; agentset containing the patches that are roads
6 [+ W1 L0 S( X8 _  h. z# H- E]" h$ ?) l/ Y7 \6 J3 a
! c6 w: Q3 D  B
turtles-own# V" @0 A* E4 ^1 _# M5 E9 f
[
; q# @  Y9 r- g  `( V3 d  speed     ;; the speed of the turtle
+ k9 h8 F# ]! a) H* M/ b( u  up-car?   ;; true if the turtle moves downwards and false if it moves to the right7 R+ V+ @: ?2 u& f( S9 b3 \- h
  wait-time ;; the amount of time since the last time a turtle has moved) B: w6 B) ]* O2 s0 m9 f- k. D* \3 }
]
  b! h+ Y2 a( D4 e! V. E: C# d* Y" V6 o1 q
patches-own
5 m- U& k2 Y. w! N2 z[- N+ F+ H/ T- ?: }/ M* y
  intersection?   ;; true if the patch is at the intersection of two roads
& h9 e5 U/ x4 i' C- ^2 K, H+ n  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
) O. J7 M: K% b  K                  ;; false for a non-intersection patches.
% Q: U8 j1 T) G9 g9 K7 x  my-row          ;; the row of the intersection counting from the upper left corner of the2 A; z' N# ]2 `& ^$ B9 D6 j; t
                  ;; world.  -1 for non-intersection patches.
0 k+ a1 M8 z" U- _. V, p  my-column       ;; the column of the intersection counting from the upper left corner of the9 R8 w  V4 |4 Q
                  ;; world.  -1 for non-intersection patches.
/ I6 x6 C* I6 G4 K  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
0 `' C+ N" G8 U& o0 r/ x  auto?           ;; whether or not this intersection will switch automatically.
" m5 F: v2 `: h) I* V6 v; b( \8 G% c% q                  ;; false for non-intersection patches.$ r1 s; ~7 ]0 H0 M) h) Z
]7 r4 K7 b# a! {) v1 _
7 x8 W4 c& M3 q& Z, L

2 \0 l3 M7 u! A& i$ {. K;;;;;;;;;;;;;;;;;;;;;;
) c* U! W: a3 s' j- ^;; Setup Procedures ;;
! q) M; P9 A6 l; x# Z/ f;;;;;;;;;;;;;;;;;;;;;;
6 w5 _  c0 y% Q+ n
. q" G) K3 q& D& V5 M# h: r;; Initialize the display by giving the global and patch variables initial values.
7 C% \$ D  ^' _" k# J& G;; Create num-cars of turtles if there are enough road patches for one turtle to
: t7 C9 p& u1 I- u% x* R  W;; be created per road patch. Set up the plots.8 h5 M- K0 p* `, i, {
to setup
, f: N0 C$ [* I. i1 _2 s2 D- i  ca
5 Y) w7 ^% y0 ?) y5 ?8 a  setup-globals1 T  V- w0 {3 ?- \: v% o# ?

9 u" x& |/ W6 h3 g% Y& R  X  ;; First we ask the patches to draw themselves and set up a few variables1 L" x8 B& E2 Z4 S2 w( B  T
  setup-patches
( c8 o, ~& g/ E3 |1 }  make-current one-of intersections
5 Y4 J  q/ S* @3 M6 O9 L& d  label-current3 A! z. z3 d$ M6 [6 k0 y/ [5 r

) L- F. D- w$ Z0 U: R+ D. }  set-default-shape turtles "car"
# ?0 P- B, E* [& Z  r1 a0 m' Y+ }. v( r# l! e% H
  if (num-cars > count roads)+ i. \- e& R  q7 l! V
  [/ t$ }. i) F, P% q- R
    user-message (word "There are too many cars for the amount of "4 k0 Q6 H4 Q( U2 K& J! o# A& X, C
                       "road.  Either increase the amount of roads "
, v* q% E: i# j/ K, Y+ E                       "by increasing the GRID-SIZE-X or "
3 I. ]3 c+ p  |8 o                       "GRID-SIZE-Y sliders, or decrease the "% d; }7 m  x5 |" v2 ~8 d; }
                       "number of cars by lowering the NUMBER slider.\n"9 A2 r7 W, |" i8 U7 |/ V
                       "The setup has stopped.")
% U% q3 U& }! A) e    stop
7 n3 e1 [: r9 q1 `! i( n$ t  ]
& ?# U5 }* T& }; ^; K0 N+ T2 Z! b
( f( [- d& R2 O$ s& ?3 O  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
3 Q, m: D! h  n  crt num-cars
, ~* F4 i: \3 V1 p/ y  [
* K$ a# U' ^9 R% L+ j- r7 c% f3 A    setup-cars
$ A& `( z6 v6 U" k1 z, K    set-car-color* B! e* u+ _$ u$ P* e
    record-data
  j4 U* j$ b! V' h% B5 V" {3 Y  ]; x6 o( K; ~6 g

2 ]$ w; C$ S/ n  N  Y" r  ;; give the turtles an initial speed* [- |" H0 y, H$ s0 u
  ask turtles [ set-car-speed ]1 Z4 E/ E& F$ m  e' m5 a. k5 {
  |' `/ `  S7 ~$ P1 K
  reset-ticks
* T( i& v, ?' |9 f: v! M  E6 F* Yend
1 ^% p0 ^+ f/ _+ U! u4 I0 g& j& X* S
# Q# Q2 \! Y2 H% o. _  Y;; Initialize the global variables to appropriate values
1 W* ?6 U6 p/ p; ]! E$ mto setup-globals
6 h* o, \( R. L  set current-light nobody ;; just for now, since there are no lights yet% J3 x$ `2 C. M% Q! ^" z) T  b. ^( ]
  set phase 0; p0 Z0 z( F: U
  set num-cars-stopped 0* U9 n/ ^2 ?) Q! X, o* B) v, Q
  set grid-x-inc world-width / grid-size-x6 g; t. D# j6 ~* v$ l% z
  set grid-y-inc world-height / grid-size-y, p2 x: c4 h# U% i0 i
, u( m% j7 S; ]- c$ X7 }1 x
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
; j: B. w( S4 s# N  set acceleration 0.0991 |" d1 @; `4 r8 o7 A3 ~# J
end
8 d  g7 [6 Z+ a+ c# o' K) t! T/ ?6 P6 I. L- T% Z7 s
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
" q9 n# o9 n4 g! @9 C  V;; and initialize the traffic lights to one setting
3 a4 w9 d2 _; g! Xto setup-patches, F0 J) z- {' h/ Q
  ;; initialize the patch-owned variables and color the patches to a base-color/ `+ g, D4 w# r$ R) u) `8 M7 o1 R
  ask patches) N/ r- H) ]% |& n$ V! N* C
  [: Z6 n7 ^: ^/ P! K( r
    set intersection? false0 ~2 S( X0 y+ Q( @( F/ g
    set auto? false) F& y$ C1 g% b$ e: v# V) X1 L
    set green-light-up? true+ j+ ~$ G; k  O  h
    set my-row -1
3 F1 x# F6 C. u/ K9 e  O    set my-column -1
7 B: E& S) C4 J* L    set my-phase -1$ T/ ]9 [  h9 T$ h; s
    set pcolor brown + 3
+ m8 ^% {. s2 S- f) {$ x  ]
# t4 H3 s+ L1 m4 E; ]3 z  B8 c; h4 j7 p+ |
  ;; initialize the global variables that hold patch agentsets
7 S* u* ^+ K5 r: `( A' x1 w  set roads patches with
( P- G' e1 P% e, S! ?    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
% w" C/ \# u2 [" j+ D    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]$ B9 d- s- D. A' I9 x$ o  y
  set intersections roads with* X- \7 H7 C8 n. }
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and% Q" D8 }0 q$ C
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
7 X# h$ }# n! e. J
4 P. ^/ a7 N  {, @: H/ P  ask roads [ set pcolor white ]) s3 E4 v) v/ E) Z) ?
    setup-intersections! \8 C) ^+ n( V* A5 u
end
+ o! O7 O' I+ b4 d  b其中定义道路的句子,如下所示,是什么意思啊?' G3 r6 F5 I& L+ ?
set roads patches with
3 m' \, ?$ i0 b% i3 B    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or5 g7 {9 W* U- p( G
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
+ ^) |6 b- F+ e: j/ p/ 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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