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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。
, q9 r2 G; F5 x+ Z( k$ \5 h6 znetlogo自带的social science--traffic grid这一例子当中,
* \, v( n1 j& I: e7 l: lglobals
# ?9 J* W* c1 K" J5 p8 o7 A: r: A[
" M% o. u6 ~# i, e2 w" u  grid-x-inc               ;; the amount of patches in between two roads in the x direction
5 Y( p5 l  Q0 Q1 `6 _- q* D1 T  grid-y-inc               ;; the amount of patches in between two roads in the y direction
! z5 C* o+ V6 E. H  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
+ s% y  t+ d  g% X                           ;; it is to accelerate or decelerate  T8 P$ _8 t2 _' Q% [% Q/ x
  phase                    ;; keeps track of the phase
5 N! \* o% e) ]5 g' ?  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure8 e- g, ^4 n/ w
  current-light            ;; the currently selected light
+ A) W# l* j# _* y6 q, N/ k) `- P0 m% y9 C' j
  ;; patch agentsets/ H- b4 [; ^9 \' {7 V2 S5 g" j
  intersections ;; agentset containing the patches that are intersections
1 B/ W% c! w7 J/ d: G  roads         ;; agentset containing the patches that are roads
2 k( V) G; l  a]+ t: q* ]) p; j/ ~
; @* E$ f7 r% t7 y6 N  z
turtles-own! l& c8 ~- k) W( {+ Z* ^
[5 Z6 B% K3 a+ i/ Q
  speed     ;; the speed of the turtle+ o8 E5 A+ K9 J  j- ^6 T) p
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
, _' l# V% a- r' t. G0 h  wait-time ;; the amount of time since the last time a turtle has moved5 E, u+ h, t/ k$ N: V) X
]) E+ l, x, G5 y

9 [7 b/ X; l/ k! V$ ipatches-own" u5 V8 A% I; A5 p3 _1 O
[
6 ?0 J! m! J1 r& G  intersection?   ;; true if the patch is at the intersection of two roads& D) Q+ h" C! l6 z% F! Y
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
! s$ M) e1 f- T5 B! n1 W1 Q& o# q                  ;; false for a non-intersection patches.
7 M: R& d: b' C2 ^; j  |2 e  my-row          ;; the row of the intersection counting from the upper left corner of the
) J; s; [+ i4 {4 V8 L# Z                  ;; world.  -1 for non-intersection patches.
1 m2 Z- }! D0 k  my-column       ;; the column of the intersection counting from the upper left corner of the
7 C. {# Q+ O! T+ e3 U2 z( l                  ;; world.  -1 for non-intersection patches.& }+ S( L) T+ @3 t3 d) j) F
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
# N; r) ^$ [/ w6 {0 r+ o5 `  auto?           ;; whether or not this intersection will switch automatically.
3 Q( F+ t8 l/ V9 E: u# Z# r( E                  ;; false for non-intersection patches.( h0 i1 e1 i/ i* ~
]0 t  W. \9 v& u5 S! H( w

3 r6 j; m* m, ~, `! v7 w
$ i  K4 ?3 K0 L: r1 B$ Z5 J;;;;;;;;;;;;;;;;;;;;;;
5 s' Z7 p7 \' O+ o* G2 W;; Setup Procedures ;;0 ]3 V" ]  I, K
;;;;;;;;;;;;;;;;;;;;;;3 r' m: b8 `, b1 D* {; s. i, k0 U

4 W8 z: [; V5 w! \+ g5 q;; Initialize the display by giving the global and patch variables initial values.$ X9 A# Q6 v: |, k5 G7 y; i* e
;; Create num-cars of turtles if there are enough road patches for one turtle to: v1 ?; l) z' I& \. s, g; ]
;; be created per road patch. Set up the plots.
7 `) \, Z( ?" |: r; Rto setup
6 a3 O2 t$ C* g+ d: e1 H) P2 _  ca1 s# A* q' z# p
  setup-globals) N0 U* Q& P( I( w1 q* h

  }* `7 |# t9 R9 Q  ;; First we ask the patches to draw themselves and set up a few variables+ E& Z+ P0 `4 i! i
  setup-patches
( i/ T$ I' j( l8 B5 m  make-current one-of intersections2 A  [/ p. t6 }
  label-current
6 Q# t, p' Q% [# b) A( ~; K5 J" ?# K& N/ ?  b2 Y
  set-default-shape turtles "car"
' o9 Q: a" }" [) k, I, p2 n+ h
0 q+ o: q# ?/ @5 z! s5 b  if (num-cars > count roads)
, g6 d/ B6 ]% c% ^  [% W! d8 b/ U& u0 y, C
    user-message (word "There are too many cars for the amount of "9 e5 z+ w: }1 I& E  U
                       "road.  Either increase the amount of roads "
5 H) o; S  R( U9 j7 N' M                       "by increasing the GRID-SIZE-X or "
0 R( X: m1 u* k/ u5 O                       "GRID-SIZE-Y sliders, or decrease the "
" j: ?( A: z$ b2 Z% D                       "number of cars by lowering the NUMBER slider.\n"0 X4 I- H; h" m
                       "The setup has stopped.")* l( @' u% v! L6 r' R7 t
    stop2 X1 p0 l2 w$ m7 b6 P/ R
  ]+ Z  z# I8 D, D2 r
6 g( ^6 G8 k( C9 K" @$ t
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color$ w8 G1 M2 @2 f5 J& S
  crt num-cars( w. g" R5 ]3 `3 [
  [5 y% y4 \5 n8 L0 G  O; g, J# z
    setup-cars
4 }  v" p, x; E* M) D    set-car-color
" S5 ?8 ?& n2 J) w% Q    record-data' S( M9 _7 D) u( J  W6 \
  ]
/ z  b3 K* U: }5 n0 N5 H
4 Q8 q' @# g; {0 r/ d2 O  ;; give the turtles an initial speed
: U7 i9 m0 O: a$ M! J7 l  ask turtles [ set-car-speed ]. l( w6 d$ c: M! C3 z
4 J& d" v' _% R0 d# e
  reset-ticks; G8 @" V4 U' k' n% n( W; E
end
) g7 T/ U* @$ n5 S9 b2 ~1 l4 Q9 A( `' `6 Y. s! C- g$ `
;; Initialize the global variables to appropriate values
: w6 E, q% g& z( T$ O9 jto setup-globals+ B! G' R  j: F% f, F
  set current-light nobody ;; just for now, since there are no lights yet
0 [! {+ `9 i+ j3 N. F+ j6 p9 v% t  T1 c  set phase 0) B! x. L" B% t6 s( ?2 Q3 R  ?
  set num-cars-stopped 0
4 J' [; r1 d" @: K* r8 n  set grid-x-inc world-width / grid-size-x( x" G" G2 m1 J; s" }5 b/ y
  set grid-y-inc world-height / grid-size-y2 ]. H2 F+ h5 s

( }: ^% M) B2 E# ~9 u, t  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
6 d, C# W2 n* n  set acceleration 0.099
3 G1 I2 q7 z- M# F4 M4 ^end
2 X; M/ l7 T2 Y( P: P$ p: H6 @, m( ~7 y6 I" K5 t- k
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
, h' ^7 k8 y; B;; and initialize the traffic lights to one setting2 o4 k' w7 l6 }/ k
to setup-patches
6 p8 s6 C, I7 P% I# J4 R  ;; initialize the patch-owned variables and color the patches to a base-color/ T0 n. ^0 a, S; V6 `
  ask patches) L; e* g/ m0 Z0 u
  [# D2 z% M9 A# @$ _' K. n
    set intersection? false# T' r; K/ q; `  I: r
    set auto? false( z2 I7 }0 @! E2 i
    set green-light-up? true) D( ~( m3 j; H. s# Q  @) W
    set my-row -1: P8 D7 d9 }% J, k$ a; d9 M
    set my-column -1
* s4 z6 M% ~% s0 w$ _/ g    set my-phase -1
% F4 y& D- p1 ~    set pcolor brown + 3
! o* D& L  Q! Q% S" w% L: O/ B: N  ]
0 `% l; t1 o7 [& y( B
3 r6 i. h! V* ]  ;; initialize the global variables that hold patch agentsets& u+ s& h5 Z6 B2 H8 j* |
  set roads patches with* i/ V# `* u7 i) H" S
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
6 g- @7 k( v  G$ f* T    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]6 o! j6 h( Z" y3 I* w# X
  set intersections roads with
9 H& l9 a0 [6 f" l4 ]! a    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and. k& d5 B% U/ ~) m) g% x# A
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
% b+ Q/ x/ D/ r, P5 R
1 N, c# v- {0 X* L1 E  ask roads [ set pcolor white ]
- A4 u# G' ]7 v+ Q% _; J# E% U    setup-intersections2 |; M; Z. s# g) e
end
, [0 z6 ?1 h1 \' `其中定义道路的句子,如下所示,是什么意思啊?
% u6 ~; c* R- a set roads patches with
1 @% r" y* {  U" A& D4 m2 M    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or, s0 c6 }/ [4 O- |/ J# H( D
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
! l/ Z2 O' s, i; _( d7 {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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