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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。
2 z( P4 n0 V- e4 I+ I& ]8 Bnetlogo自带的social science--traffic grid这一例子当中,7 {6 T9 w3 X# K. ^# ^% R- `4 P
globals
/ F) J: m: Q( L( F$ X[
% g2 N! U7 s/ w! Z5 ^  grid-x-inc               ;; the amount of patches in between two roads in the x direction" B! ^2 Q' i, q( ~7 J; V: {
  grid-y-inc               ;; the amount of patches in between two roads in the y direction
9 J: f& T- d, W$ }  acceleration             ;; the constant that controls how much a car speeds up or slows down by if, F$ k$ S7 |( Y7 k& i' E
                           ;; it is to accelerate or decelerate- t' O4 A& t$ h
  phase                    ;; keeps track of the phase
  }2 k7 l; n" [4 w% l" ?' ]  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
! q/ {8 y& Q* k# a/ k6 A" R9 R# ?  current-light            ;; the currently selected light! O2 x6 m8 i; }; y% J
% b& o( ?+ [$ W) r1 H& U
  ;; patch agentsets# S( j2 s3 a5 ]/ e' Z. R- ^7 R9 Y
  intersections ;; agentset containing the patches that are intersections7 |4 ~: F/ O9 o5 z
  roads         ;; agentset containing the patches that are roads7 a: H1 V6 N) T6 z4 x3 D
]
# @. y) Y: e! A. j( `% G. {: H2 ]( b
turtles-own* z6 \$ Z* `( M% ?9 _9 A% `
[
1 ]' l  l' ?" j7 N; M+ @  speed     ;; the speed of the turtle
" g1 B6 [/ ?" h! F8 r3 [. K  up-car?   ;; true if the turtle moves downwards and false if it moves to the right6 g5 ~- o) Y1 n/ O6 f
  wait-time ;; the amount of time since the last time a turtle has moved9 W* k4 H7 M3 K& B: o* J
]
0 [: o( T. V( |: E; F1 C" w0 E2 H% \6 n
patches-own, f' C/ ~" t0 }. P  H2 m
[/ D! E# `! T2 y' f
  intersection?   ;; true if the patch is at the intersection of two roads9 @9 }% d& ?8 s$ _1 B  k5 ~
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false./ A" I( b, x) F* \5 @8 Q
                  ;; false for a non-intersection patches.9 T) z9 \# E$ C1 n9 _; ~2 V, Z
  my-row          ;; the row of the intersection counting from the upper left corner of the
) S/ T$ {- @: s& w0 K                  ;; world.  -1 for non-intersection patches.# h  r( t0 @9 w3 I' d" c" R
  my-column       ;; the column of the intersection counting from the upper left corner of the# e( A% [8 M. D" _! W
                  ;; world.  -1 for non-intersection patches.
" q. P/ `1 G/ k0 q  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.: A9 e4 I( f% f5 D1 z8 t
  auto?           ;; whether or not this intersection will switch automatically.4 z, D1 M6 `0 e. @! z
                  ;; false for non-intersection patches.* ^& C7 x4 S) r' d. Q5 u. P
]; M+ C" y! ?- T% t; R1 k
7 V) _! p  i! v( d

: X# g+ u% x* t% ];;;;;;;;;;;;;;;;;;;;;;
  u2 I; B* {  P; m;; Setup Procedures ;;- H- {/ u( ]2 S% w6 y9 D6 Z
;;;;;;;;;;;;;;;;;;;;;;) [+ N1 }- s! N; Q2 [( K& U
9 J3 f. }. O, b. p0 p
;; Initialize the display by giving the global and patch variables initial values.
  O) p8 J& G. x$ ~" L;; Create num-cars of turtles if there are enough road patches for one turtle to
5 b$ J/ Q7 z1 @% l;; be created per road patch. Set up the plots.
* A1 ^. m2 Z5 Ato setup- {0 O0 Q8 F* ?) E
  ca7 B' r; B) E  g* ?% {+ v5 N
  setup-globals
1 B8 u0 s" p% ^1 U  _" B6 A/ P3 D" ~* v9 a- @. P( Z9 ^7 |
  ;; First we ask the patches to draw themselves and set up a few variables+ O7 C1 [" r4 C
  setup-patches
2 p$ c, v8 S0 Q! n8 s4 {( S  make-current one-of intersections
$ O7 ?, N) i% n- N8 x5 G- T  label-current; c/ |+ ~: o, g- N
7 [  b# [0 i- o* X$ h" }3 {. k( n
  set-default-shape turtles "car"
0 D% m6 R% }) l4 ~- ^* |8 G& }3 `. A/ N- L
  if (num-cars > count roads)
# L9 X" ^, y7 x% ^# G1 g  [1 Q* j% F; ?2 [$ b9 _
    user-message (word "There are too many cars for the amount of "
6 S" K6 T" x7 B+ V& O7 w                       "road.  Either increase the amount of roads "
3 \  ^  ?3 b1 h: d, \% d                       "by increasing the GRID-SIZE-X or "3 b) a- a& W+ y/ `( M
                       "GRID-SIZE-Y sliders, or decrease the "
" Q' V5 Y) [2 }/ Y8 o                       "number of cars by lowering the NUMBER slider.\n"; y3 {% |; b0 F! i3 F
                       "The setup has stopped.")  q0 P) X$ b& @; c
    stop
2 L/ b& C- O4 y: p  ]1 f: k* K1 q6 {, _& T, j: n8 S" |
* E, T; k5 C# r  H0 q# `5 ?7 z
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
3 U6 O; h' H) ^1 g1 r' Q  crt num-cars) r3 ~" p2 G! }* W8 D
  [& m# m. n% L  A
    setup-cars4 w- d% F* _: |
    set-car-color
1 a( F0 a1 F: B+ E    record-data8 D$ g. {  D9 U1 E8 \
  ]
5 K6 h, [8 _- V4 M+ g# ^1 k, B6 }' c! a- }+ x$ u" Y% t) U( p
  ;; give the turtles an initial speed7 }6 ~, e" t* [, [
  ask turtles [ set-car-speed ]
7 S& L) A7 P3 ^$ o# U0 I4 c( L6 v  B# T: Q8 h
  reset-ticks
' t, z( ?2 d' aend
# I3 b! `6 J6 ^% E
) W  Z. z0 }, F$ t+ l;; Initialize the global variables to appropriate values
! N& R4 ^) P( E- [' M. J2 h0 k( Pto setup-globals! U+ d3 m5 u* K! F
  set current-light nobody ;; just for now, since there are no lights yet* P0 Z- h) S5 }
  set phase 00 e) j" `/ q" K$ i9 Y5 s7 G% l
  set num-cars-stopped 0
5 X( R# m# g5 G* H" E* O/ h  set grid-x-inc world-width / grid-size-x
! M6 z9 a+ S+ l0 l9 A( q  set grid-y-inc world-height / grid-size-y; z% E) Y! l, r* c5 y9 |

: G* L# O% _5 y  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary, D/ D: n- [8 P/ r2 n
  set acceleration 0.099$ k5 a3 D. Y! }2 r2 q- }1 ^
end
% A" ^) f; N5 y. d6 ~% J1 T1 C1 }* _1 U: z  W/ C' u
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
0 b( ^5 T3 P' w" V! };; and initialize the traffic lights to one setting& m% f- Z/ R; O; Y
to setup-patches
! b9 ]( t: f. C5 P) g: l8 p3 `  @  ;; initialize the patch-owned variables and color the patches to a base-color
- o) a1 K. _0 W! H: t# V. f* e  ask patches. x7 q2 j8 `1 h% ^( H2 O
  [
( n3 v9 L" c- m* b    set intersection? false, k+ s- B/ Y+ X1 c2 V; e$ j3 H
    set auto? false
0 b' T0 E; g$ @- e$ z    set green-light-up? true
+ O8 M( e5 Q7 p4 e' \2 T. ~4 K    set my-row -10 |! t" r" `1 [4 q9 {- p
    set my-column -1
* B4 Z, t* R# T0 K# @: ?( k% z1 }    set my-phase -1. ~) e7 E4 _/ u* O2 |: _1 ]
    set pcolor brown + 3
9 A; O1 `* \1 z/ X" i; D: [7 u  ]( j  d  U% U5 I6 Z! |
5 e5 K- V2 d6 Y
  ;; initialize the global variables that hold patch agentsets% _+ A  Y" e2 y! x7 E  S
  set roads patches with( ?3 B" I0 I; L+ V
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
7 ?' x+ {: ?' u2 j: h    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
! x+ H% M$ ~1 u2 _  set intersections roads with0 L4 @  y' t! u
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and8 H5 b& I1 {8 Y# S* [; l
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]& J1 @+ {9 K* ^8 i  t" n8 A; E
: r. ?- h) q- L$ p+ Q! k
  ask roads [ set pcolor white ]7 s& h+ d. g# K6 V9 v! x9 G8 X9 R3 a
    setup-intersections
7 z0 w, Z: g* N% p4 Dend
! [" s1 o- m0 w5 Q1 c5 b其中定义道路的句子,如下所示,是什么意思啊?6 T  C& W: \8 k- M- b
set roads patches with, }6 v, T& X9 o7 q7 _4 _6 ^
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or0 q; x# ?1 b6 I- Q( w  I
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]( j3 {" u# |8 G6 g2 b& L6 m7 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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