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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。
7 u9 c' s6 `$ x- |netlogo自带的social science--traffic grid这一例子当中,! B$ J; u) \9 @9 @0 ]
globals3 _0 B/ [0 q/ I- e3 V
[
' Y3 J4 P% ~8 X  l6 u  grid-x-inc               ;; the amount of patches in between two roads in the x direction) ]3 T* G( w( }( h) k' e
  grid-y-inc               ;; the amount of patches in between two roads in the y direction  w" ^8 E1 u: {7 @; s
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
! C% @, w3 r8 B5 b, R" t9 M                           ;; it is to accelerate or decelerate
$ B! V. t# W3 I+ B3 B  phase                    ;; keeps track of the phase" S/ U" r7 _( ^) ?
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure6 [7 U! l0 m4 K' R& ]
  current-light            ;; the currently selected light- h" }5 O  l- W( Z3 d

% j, |8 O3 u4 o1 O5 Y9 t  ;; patch agentsets
) F+ S' z9 K6 K# q  intersections ;; agentset containing the patches that are intersections, f- V  h9 q; J8 c
  roads         ;; agentset containing the patches that are roads+ F* T8 D% e7 {9 F1 i
]
- `" ^6 U/ Q4 _
. m6 h9 o; y" x5 Y, Qturtles-own
; `' W) B6 L* o2 ]8 C! u( p/ G[6 b& ~2 u( S/ V! b% _# l2 g
  speed     ;; the speed of the turtle
9 k# ~  \" x- B7 f( G2 H  up-car?   ;; true if the turtle moves downwards and false if it moves to the right- b9 o( e" C3 E
  wait-time ;; the amount of time since the last time a turtle has moved
# |4 m4 m0 W* w$ x& N, D) []
( q  a' g; ?) S& V: b8 P
% {# B3 b; H; t2 b6 n, [patches-own
3 t- i0 |' t) I4 J[) d. k- F  e8 r! y$ a
  intersection?   ;; true if the patch is at the intersection of two roads/ \9 l* q3 r& W- x% L
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
: o4 h: S: W. u  f                  ;; false for a non-intersection patches.
0 p, y$ Y- x* v5 c- e2 }1 O  my-row          ;; the row of the intersection counting from the upper left corner of the0 U5 m! l5 Y* d  M
                  ;; world.  -1 for non-intersection patches.- v: ]4 N( E6 ^
  my-column       ;; the column of the intersection counting from the upper left corner of the
' G3 C8 ?( A* e( U- R* d                  ;; world.  -1 for non-intersection patches.
- B* o5 m) D9 x3 z! M, a3 p! Z  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.& ?3 L3 Z0 \9 P# M
  auto?           ;; whether or not this intersection will switch automatically.
2 X0 |3 C% G( ?* @                  ;; false for non-intersection patches.' u1 k/ `2 e. l  I( b  U1 p- I
]
/ v9 ^  D6 q) k' h* @/ n5 A4 ]! h5 ^( e: d( x  M7 B
/ R& g7 {$ U5 h* l% k; u
;;;;;;;;;;;;;;;;;;;;;;, f, l4 l$ A" V" O
;; Setup Procedures ;;
- |$ s8 s5 ^6 `;;;;;;;;;;;;;;;;;;;;;;
+ d( [* _3 F9 j! i# N5 _7 d' w3 ?+ l) D/ d. I" p
;; Initialize the display by giving the global and patch variables initial values.
9 A' M5 x: m* v;; Create num-cars of turtles if there are enough road patches for one turtle to
$ I! R6 N5 m9 l, b3 t;; be created per road patch. Set up the plots.
2 c, I( [% K& w3 ?/ Y8 z4 xto setup
: N- u: M! W5 ?+ r& {" o  ca
- S# h3 g! _7 X' Y4 L" b  setup-globals" \  I- H: [8 F7 f

, T! K! z, k7 y  x" _% ?: t  ;; First we ask the patches to draw themselves and set up a few variables: {7 K% ?, k5 s5 b' f; K5 U
  setup-patches& J7 f. z' [; k6 C, c6 Z
  make-current one-of intersections9 u% A% L% i7 _/ [' G# C
  label-current
# A- ]3 B( F& R6 a3 P5 l/ c; h% C! N) k" [9 l5 W; u
  set-default-shape turtles "car"
1 S9 G9 _9 Q( g8 F& V
; ], h( K4 K( d  h2 g* m# V% Z, q  if (num-cars > count roads)) ^7 A- p" M% d6 _$ m! C1 E
  [
2 s9 o" j& a* }: o2 I- W2 @. U    user-message (word "There are too many cars for the amount of "
8 t! ~. d# F; z& J$ [                       "road.  Either increase the amount of roads "$ W- y2 A3 _+ }' f5 u
                       "by increasing the GRID-SIZE-X or "
) d) F/ s' p# {2 {( L                       "GRID-SIZE-Y sliders, or decrease the "& z9 _/ k1 ~' b- w
                       "number of cars by lowering the NUMBER slider.\n"% N5 t' s' J9 n' m" m
                       "The setup has stopped.")- p  L0 X* A9 F& ?) q: ^# H
    stop
$ m3 i" V6 ]5 }! x8 K9 ]  ]
; v2 A6 W  b, o7 J4 T# f) E
, ^0 X4 s5 }& u! ]  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
: ^" u( N8 O6 p  R/ z6 u  crt num-cars
* d7 \( w# y' X4 t2 M$ Q- p  [
2 C8 e( q, g2 G. B/ b  t* C    setup-cars; z5 G. e2 ?+ P7 ~& u
    set-car-color
2 h$ j- u$ ]$ L7 B( H4 o) }# s6 Y    record-data
2 o+ L& n: a- S' R; C  ]
& C+ E0 Q5 Y  |) x5 a6 @3 ?# U) e! H1 U3 ^9 X: P+ c" ^
  ;; give the turtles an initial speed! J# ?, _( a, x* e' M
  ask turtles [ set-car-speed ]
, [$ a1 g+ D# U% t: C0 ^' z" h/ w# `# z8 A3 g
  reset-ticks4 D1 F! k# \' ^/ i: T
end
- p$ _0 X# {7 g$ x! S8 y0 Q# s2 f, u/ Y: S* S9 r
;; Initialize the global variables to appropriate values7 O" A" N  q$ X, o: z7 X
to setup-globals
6 w+ d% o# o) P3 q. S; ^* a  set current-light nobody ;; just for now, since there are no lights yet
! D& T1 _+ Q7 T% Z; F3 M' L- b  set phase 0. d7 N- K- V' m2 k
  set num-cars-stopped 0: H9 ?* i8 A5 {3 T% r
  set grid-x-inc world-width / grid-size-x
9 U' ~0 p- S( l( ?8 a6 Y  set grid-y-inc world-height / grid-size-y
; G) A1 H' f- H' q: f2 S; ?- |( W1 l7 y
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary. F2 y5 w9 I" J, L
  set acceleration 0.099) V2 k9 L4 c% e& J
end( h+ T# Y) W' I* I: W% \" p' y
- l/ S' m' C/ g- S9 [5 c1 z
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,! ?: S3 P/ B' Q: o+ P% l/ w! U
;; and initialize the traffic lights to one setting  x3 ]" K! c' X7 H4 H" n: @
to setup-patches  {% O" D. k8 H, W- I
  ;; initialize the patch-owned variables and color the patches to a base-color
, B0 `) ?' r+ W  Q: r+ X  g% J  ask patches! E* X  w, h* j2 p* ^) H2 E
  [/ W1 ~0 F. M3 ^) R+ o5 H& i5 F
    set intersection? false$ N/ ?) n- n4 I+ J  h5 P+ Z
    set auto? false; m7 Z- R, k# a$ R; {
    set green-light-up? true* R: @# ^& [" R. @* f" E) Y
    set my-row -1- l1 H( J. I% B
    set my-column -1/ x1 v4 s# {+ r3 Q( q  `
    set my-phase -1
6 k# m( V9 _: g    set pcolor brown + 32 u: |# @, [+ ]& |8 G. r( _
  ]! L- z& P) {9 F: k7 x$ {6 f

- |: ]4 ^( n; w1 T! F  ;; initialize the global variables that hold patch agentsets
7 v1 `" E) y* t; j  set roads patches with
& O# ?, ]  D- R$ M: p9 `. g1 w  N    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
- b) Z' }& A- p. C4 q% |    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
) e0 ]! R1 f& J3 ?6 p9 {  set intersections roads with7 w) T: p$ K$ k! L8 h5 ~
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and* j9 g/ `. @9 y1 L
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]$ F6 `5 m) k' h& Z; C

8 h: A# K* S' m8 V$ a$ c  ask roads [ set pcolor white ]
- ^  L, h9 c8 x# ?    setup-intersections
/ a4 U3 F4 R' U) N4 ?& p8 z6 G: _end
7 ?* S7 ?  p' s5 v" e0 i9 q( B9 n其中定义道路的句子,如下所示,是什么意思啊?) x, v( Z  J$ [5 t- S1 Q9 @
set roads patches with
# h0 d& Z# q/ X; y    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
- [  x; j. u4 Y1 ~  h4 i' f7 u    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
, |1 d/ X, i: R5 y# Z  n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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