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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。
4 x' {' a7 f* Z# `! `netlogo自带的social science--traffic grid这一例子当中,8 a- u: Q) e5 n8 P, d8 o' D
globals% D# u9 |0 Y3 g& Y& {
[
0 P  l" d; {% _0 H  grid-x-inc               ;; the amount of patches in between two roads in the x direction& _) v5 y: Z# i* o* `
  grid-y-inc               ;; the amount of patches in between two roads in the y direction6 _) L7 e# R2 i  c$ J' ~! c
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if2 ?' k. D' S2 X6 K
                           ;; it is to accelerate or decelerate
0 q4 \1 A5 T) B; b/ M: N  phase                    ;; keeps track of the phase
1 M/ H: G/ y# ^2 c: O  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure) l4 L( b: H. [. i" [
  current-light            ;; the currently selected light/ M5 L2 B0 c0 y

. j7 ?+ }3 k- J7 }4 S$ T+ l9 I2 n  ;; patch agentsets( \) g3 [3 \0 \) z: m4 a, a0 U
  intersections ;; agentset containing the patches that are intersections
2 Q/ L4 r2 C- \$ @* Z, F: S. p9 Z! }( O  roads         ;; agentset containing the patches that are roads1 O% {" J/ x7 a  s
]
9 S/ W) }/ N! b: Z, R5 M" A7 v+ ?2 Z
turtles-own  m. I* X) X; E8 d6 b1 l
[" `4 U% ?. b# J0 \7 z3 w
  speed     ;; the speed of the turtle
$ Z8 ^4 F) O5 R! A- b3 ?  up-car?   ;; true if the turtle moves downwards and false if it moves to the right4 l" t* i! M: y) q/ H& l; q8 J' S
  wait-time ;; the amount of time since the last time a turtle has moved
7 @9 r- w# ~' b+ q% }]0 N* F) w( T, v# G# ^

- Y( h' d+ r4 Tpatches-own
4 z6 C+ J4 X5 k[! b! }' H" v+ f$ p) O5 k) O+ I
  intersection?   ;; true if the patch is at the intersection of two roads
/ H# O1 E4 a- L+ {  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
+ K( I# M: u3 V4 }                  ;; false for a non-intersection patches./ F0 c  ^8 _7 q" Q8 ~9 P
  my-row          ;; the row of the intersection counting from the upper left corner of the: t6 J* }% P! P
                  ;; world.  -1 for non-intersection patches.
' z" q- ]) R. d  R* ~  my-column       ;; the column of the intersection counting from the upper left corner of the8 |; s! e9 t& B
                  ;; world.  -1 for non-intersection patches.$ s$ {! ]# O1 G- J
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
8 g* t: e& ]; }4 `  X. S  auto?           ;; whether or not this intersection will switch automatically.
! n6 h# B$ I! U) u  ?                  ;; false for non-intersection patches.: A7 k7 x+ x' F: u
]
6 @' [4 g9 H% a3 g) c( A
- x: L# v% E/ X7 N4 |7 l3 g: l1 n' X4 {: N% R) j
;;;;;;;;;;;;;;;;;;;;;;: [+ i" t1 j9 i" e
;; Setup Procedures ;;2 _$ g( z1 l( _' I' J+ T
;;;;;;;;;;;;;;;;;;;;;;
  Q3 X% l& O( Q6 f
" X) j. d; W% n5 c;; Initialize the display by giving the global and patch variables initial values.( y$ \  m( @- r0 J
;; Create num-cars of turtles if there are enough road patches for one turtle to" u. ]9 e- k0 d7 O$ v- D
;; be created per road patch. Set up the plots.
) ^. u, v, m0 t7 bto setup7 [$ I, q- d( [# f3 P
  ca( B' D% l. e! m3 y9 u# i+ ?
  setup-globals9 w# g1 w6 G8 ]" f) k! v

( k+ l) K; }7 }% {  ;; First we ask the patches to draw themselves and set up a few variables
% ~- i) H- z4 [) W  setup-patches8 F. x+ W: p1 b! m
  make-current one-of intersections/ R! p* m, z5 {% J5 L
  label-current" z1 o# G& d; |

6 \  `! }" F5 u( ~  set-default-shape turtles "car"1 C! {/ L; F7 c/ n3 p8 }  h

( Z5 C; m2 G% H  if (num-cars > count roads)
! a( c; x+ }# m4 L; D  [2 w% N4 H8 P1 B; B& F) ]2 ~
    user-message (word "There are too many cars for the amount of "6 P5 f7 e  M/ l6 V3 p& }
                       "road.  Either increase the amount of roads "
( r: b$ E, I( z, N- T. n' I7 N                       "by increasing the GRID-SIZE-X or "& w5 [; k! U/ I2 a
                       "GRID-SIZE-Y sliders, or decrease the "
' ^/ g7 r5 a1 M& [                       "number of cars by lowering the NUMBER slider.\n") z+ b, `) ?) J. [7 [1 H
                       "The setup has stopped.")
) B* _0 p8 y- _    stop
5 J( ^" h0 B3 L9 Y7 {7 h  ]" Y* D7 f; [7 c0 l6 a

5 k. l. A, d! f8 h  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
* x+ V& I7 c9 j* W  crt num-cars
$ @& |6 ~4 Q' p- ~( v' i  [
9 z6 m) \0 @$ ~; z+ I/ H% q    setup-cars- [' H( m, h1 X0 C8 E
    set-car-color4 y" S' {5 H5 M1 ?; V
    record-data" s' S* A3 H  r' u1 F4 \4 }
  ]
/ A5 U" c+ f- k; i+ u7 Z
2 z$ l2 V" _/ j7 O4 w  }  ;; give the turtles an initial speed
  D1 e8 ?8 R% w; A' U# J/ ?  ask turtles [ set-car-speed ]0 }- G, f, C+ n7 J

1 K: v9 s* a; _. z5 r/ b5 h  reset-ticks; C/ K  e+ ]* D
end0 r; [8 s8 J- \) x' U+ v6 ~
0 u: A% F& b; D( U; D5 N: T* n: y
;; Initialize the global variables to appropriate values+ Y9 a+ W  }& R, f* l
to setup-globals
' ^- ]/ ]7 b/ G: a  set current-light nobody ;; just for now, since there are no lights yet
; @" q0 I+ h- i$ n0 l  set phase 0
: s( E* S! M+ F" H  set num-cars-stopped 0
& d  T; l! g- v4 q* H, ?' M  set grid-x-inc world-width / grid-size-x. J8 E" E3 t! [* Z- a
  set grid-y-inc world-height / grid-size-y
$ T& I% s5 H5 g# y! U1 g+ Q) ~- Q
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
) W4 |& p7 c6 _8 B, P  set acceleration 0.0991 C5 B2 o* }( D- C
end
4 ^% `. j5 I9 b* a$ U, `' Z6 A4 y" R. }4 |
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,- r4 |2 x( g0 d, N* l8 u
;; and initialize the traffic lights to one setting
5 z; ~! y: s! A. ]0 Vto setup-patches8 `5 q& m4 f- o- }/ \- A
  ;; initialize the patch-owned variables and color the patches to a base-color
  l. e' H+ o; M7 W* `: D  ask patches8 N& z& S" o1 \/ F$ m# @1 t
  [. o4 i$ y/ M& `, Y
    set intersection? false7 d0 b1 B+ [+ N3 V5 s! }! z/ z
    set auto? false/ ~) I8 S( f( q# ?: u/ A
    set green-light-up? true
, J* j) f, g7 M4 Z1 T4 }    set my-row -1
2 m. D- c% W4 m, {, V" g2 ~3 [# |    set my-column -1  P8 @6 z+ z. r
    set my-phase -1% g6 Z7 Q) G1 t9 y5 G
    set pcolor brown + 3
) U" l, f/ J$ T- y  ]
- J! O5 C- B9 X+ @! h: i8 \
8 Z/ v7 `# @2 R8 }9 k  ;; initialize the global variables that hold patch agentsets: E+ b  z# O& [  @* ~
  set roads patches with
) X9 x: z; e0 g& d! \$ {# n) `    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
" E3 a& I9 }+ Z0 s- f. q+ V5 @, z' j    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]" M0 [' v" y9 u/ `) f: D7 Z) |$ g
  set intersections roads with) ]( v  ?& J% a( E) P2 _  ^8 b
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and9 |- i" |( Z% d& |4 _' ?
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]1 G9 T* R; X6 J/ C0 ^3 ^2 E) b* Z

3 `) Q  n% L0 v: s0 g1 i& Y- G& Q  ask roads [ set pcolor white ]
9 P8 I& r& L  F    setup-intersections
+ o: Z, A  X, e: Xend
' F. k7 p9 ~- L3 H" S3 n4 J其中定义道路的句子,如下所示,是什么意思啊?
) B0 X. W' p5 {7 w  P1 D, a set roads patches with& M$ X5 X4 ~7 f, \; {( p
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or( {8 O/ G9 H( d* |, a) y
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
2 w# {7 k0 H$ G9 S" ?( l/ z1 W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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