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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。
8 r. ]1 x) a% E& _2 m; ^% dnetlogo自带的social science--traffic grid这一例子当中,$ {1 p! _0 ]; v# m5 R' O2 x! M
globals
& v2 q# t  m9 s2 b6 z9 B% p( C[% I, ?% _+ S& {7 ?
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
1 o" ^: y( {4 u! ^  grid-y-inc               ;; the amount of patches in between two roads in the y direction
% a. C4 z$ S; m) u$ \8 _0 v  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
" A$ y) V6 g$ ]& p& d3 c- g* K                           ;; it is to accelerate or decelerate
% A" h2 R  W* f4 j6 Z/ K  phase                    ;; keeps track of the phase
3 d0 a3 Q( }8 {  z, G: l8 t  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure$ K& U' x% o& w% L4 z, W8 ~5 K
  current-light            ;; the currently selected light3 x. G; U, y4 h+ S6 x

. o5 G6 Z, b$ i$ `* U. Q) d  ;; patch agentsets
1 r2 B) G2 _* w" y9 E0 I  intersections ;; agentset containing the patches that are intersections
6 T7 `5 c; n  t/ j8 y' j  roads         ;; agentset containing the patches that are roads
7 }/ B- T6 G! X" ]) \! u8 {]
: q. k3 Z- g& E! v) z* k7 T+ o8 ~% U; `
turtles-own' y' w. d2 v# `* I5 o; r
[
$ E$ u0 }: }5 F0 z7 W  speed     ;; the speed of the turtle
" N+ q2 x, U  [  up-car?   ;; true if the turtle moves downwards and false if it moves to the right, n  U, ^) c# Y2 u
  wait-time ;; the amount of time since the last time a turtle has moved7 n0 Y) A  M% Q% @+ c# i
]
. \: s$ d! Z$ o6 U5 B+ i
/ y' N5 g/ {5 h* Xpatches-own
- k% W' G3 B5 M4 ^! C! ^[
3 H! e- S; G6 x  intersection?   ;; true if the patch is at the intersection of two roads
& T8 ^% f* Y6 s% D8 s" w  m' `  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.4 x0 a/ O6 F' {+ I. Z
                  ;; false for a non-intersection patches.
0 w- E. Z. {5 X9 y  A9 n" `; @  my-row          ;; the row of the intersection counting from the upper left corner of the8 r  R$ O+ }' l2 [' Z, r1 E  I
                  ;; world.  -1 for non-intersection patches.; a% i0 w- R2 X# J& b
  my-column       ;; the column of the intersection counting from the upper left corner of the0 \0 V) D7 o$ `5 P
                  ;; world.  -1 for non-intersection patches.
! c4 I' t6 x3 y$ ~0 I  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
: S: y  _; K$ U8 k1 W6 |- L# a, ?  auto?           ;; whether or not this intersection will switch automatically.5 [' F. j  b: w% K
                  ;; false for non-intersection patches.1 ]0 t5 q9 F+ w
]
  K, U: f5 a: z$ N% K/ x; r, J) {9 h. T
0 z% [- j* m) O6 u
;;;;;;;;;;;;;;;;;;;;;;* ?/ v! w: @% d4 B8 P0 b6 _
;; Setup Procedures ;;0 t- @9 ^1 T! H7 [  s" K! u* g
;;;;;;;;;;;;;;;;;;;;;;2 t( |# }0 U6 E5 y& t- L+ E) k
0 F( |% J$ A7 s# P
;; Initialize the display by giving the global and patch variables initial values.9 U7 {$ h* M( E* K# b8 f
;; Create num-cars of turtles if there are enough road patches for one turtle to- D% N4 F' t; D6 P& m% a; P  q
;; be created per road patch. Set up the plots.& y1 {$ {4 T. C: C( ?
to setup
+ C8 o* {& {/ {+ Q  ca' t+ n5 R- I0 r: H1 J* D4 t
  setup-globals" E8 q3 H4 K1 }
0 h3 V4 S8 i8 L
  ;; First we ask the patches to draw themselves and set up a few variables
8 ]) F7 Z2 w- Z+ B# ~3 r$ m4 J  setup-patches9 z  Q( `2 O4 T, Z+ i5 r/ k. e3 S
  make-current one-of intersections# z9 h* U7 G$ j0 W. X
  label-current5 E2 [8 C) P3 f: q( i

3 {, u7 l. w  Z6 e0 g4 t  R  set-default-shape turtles "car"
: ?; g( T1 f5 B2 r
: `& ^9 @* D3 l+ F1 `% f& v7 l# K  if (num-cars > count roads)  V3 g/ j  E3 _" H7 d
  [
* X- z0 f* g5 s& _) R  Z' e4 M    user-message (word "There are too many cars for the amount of "$ ^4 I! E3 u- l7 I5 |3 o6 R2 @) H
                       "road.  Either increase the amount of roads ". e" M2 c, O" K$ ^$ \
                       "by increasing the GRID-SIZE-X or "2 |6 B: j' B6 y. U
                       "GRID-SIZE-Y sliders, or decrease the "& P) c3 G: @, e$ i
                       "number of cars by lowering the NUMBER slider.\n"
# p4 a: }. G4 \                       "The setup has stopped.")
& O! u! O' y0 y    stop# o8 Q6 b7 `5 [0 j4 p
  ]
8 [, j7 w& R3 w7 F
' v9 S: h' p9 D% D4 `# J  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
5 N2 ^3 S1 r( v% D4 p  crt num-cars
: A) u* V6 }; A' l* b* c6 w6 B  [
, N3 M- Q) S$ _2 S+ s& w; r    setup-cars
2 E: [; r. S% V; e8 ~4 L    set-car-color+ u4 e. [$ f% N! |# z2 x1 H
    record-data
# @( |6 Q9 I" p' l  ]
; E, ~2 r3 T9 J: G" f$ c1 C  n% I  Z' J8 X( y1 o5 }/ c
  ;; give the turtles an initial speed4 W) ^) K6 u" |- ]$ j" X  h
  ask turtles [ set-car-speed ]
0 E2 Q) S- P* @; x: N, o/ G0 q1 x: h/ ]2 d1 m' ?+ i
  reset-ticks3 j  v9 o% n' {& y9 R  e8 h
end3 S: T) B8 V3 l4 Z2 K) B2 \$ i

1 l: W1 A7 t4 G) d9 \: }9 r, E;; Initialize the global variables to appropriate values6 c$ S: c% l: O: P$ s  A
to setup-globals. K: @8 B7 X8 r1 R# M5 f
  set current-light nobody ;; just for now, since there are no lights yet; M( D9 a7 R( b
  set phase 05 `9 e" a' p; C& X" C
  set num-cars-stopped 0/ _2 O' b# I9 `) m+ q6 C# d9 V2 i
  set grid-x-inc world-width / grid-size-x
) B: m9 l  r0 X  set grid-y-inc world-height / grid-size-y6 Q, G4 e  L, Y# ~7 P
- U- W. t' S; D8 z, I& e$ Q' j0 t
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
2 U# G: l7 {& d% L. F/ G0 F  set acceleration 0.099/ B' n, G6 n; J
end5 D# G1 p7 K9 W; l3 w2 q/ {! o

* B; m' }; S: ]$ R% F8 a# M;; Make the patches have appropriate colors, set up the roads and intersections agentsets,) X! f* w4 V+ \. v% j9 Y7 n
;; and initialize the traffic lights to one setting: ~# m& C( y1 M& }
to setup-patches' k$ B* Z3 }1 ?, j# P+ T$ v+ L3 j
  ;; initialize the patch-owned variables and color the patches to a base-color2 s) f7 q6 W- A5 t' m, t, D% r/ V
  ask patches
) n" _  s( K. X; ?. C/ c. m% ^  [+ m( ?* A" e) X- B( A
    set intersection? false
5 i5 Z5 u# p& o( _) g$ T    set auto? false; o6 o5 e& i& e+ d% K9 }
    set green-light-up? true
) s+ E: e: f; O    set my-row -1
9 g0 K  l8 x( F; C1 I+ w    set my-column -1
2 A7 o- p" ~9 `# y+ ~    set my-phase -1) q. u( m) H/ ?
    set pcolor brown + 3
& d# r- H2 D2 M. k  ]  B$ i4 o. B) ~- P1 J+ R' _2 h
5 F2 v0 q# U8 l5 W' J
  ;; initialize the global variables that hold patch agentsets
4 h6 T% v2 O% K" k8 l  set roads patches with6 E3 ]: Z3 ?9 E2 |- ~& V+ g" m( Y
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or  E- b# z( g5 u" O
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]9 @5 v( b- G- L
  set intersections roads with
! M# P$ t( ^3 N9 }7 O    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and: I5 x; P, M4 F5 b! m# O! k" K
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]) ^3 K2 q7 y( u
% \5 p* L5 w9 {' A" Z
  ask roads [ set pcolor white ]
0 `: ~  @. p+ @8 O' F7 f    setup-intersections3 V- ~* J; \4 E6 w9 Q& j4 k
end
1 Z$ q( V! t  v& h+ {6 D5 h1 O% ?其中定义道路的句子,如下所示,是什么意思啊?5 ?! }" }; A1 _* q& o! S3 s
set roads patches with4 F" j0 Q0 u7 _: K$ \9 g
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or0 \$ k- K) s! g3 _
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
6 M/ H2 t0 B% Y( _5 I& }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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