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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。
) z" @1 d8 o" _0 T! X* H; t% Cnetlogo自带的social science--traffic grid这一例子当中,- M% P  h% B/ u# w7 P  r9 s7 _4 H" w
globals. z0 O. n) Q5 [0 _8 _7 e3 J) H
[
; p& D* ~. Z8 |  |/ v+ ^/ @& w  grid-x-inc               ;; the amount of patches in between two roads in the x direction
& O9 i$ Q: }/ Y6 T& r/ V  grid-y-inc               ;; the amount of patches in between two roads in the y direction4 d3 S9 @! x, x8 d% A5 R/ U% g
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
/ E* D' t+ R; L. C1 _5 B                           ;; it is to accelerate or decelerate
  A) r- c- ^/ s4 U- I  phase                    ;; keeps track of the phase
- G& q# W1 @# H$ G5 y$ q. j  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure5 \- R' k$ [- d: p: V, S
  current-light            ;; the currently selected light
* T2 u9 @" u$ [. \& u) h$ I3 P; C+ g% W/ W7 l. C
  ;; patch agentsets, \* f/ }' O/ _9 U4 x) f# [3 F
  intersections ;; agentset containing the patches that are intersections  k; A0 h4 ~4 A! J" ]( g
  roads         ;; agentset containing the patches that are roads1 c) u* A8 l8 Y) T( G
]
% {  t9 s1 H* n( ?7 l0 o; U# r& S# J  k& {  j) Y
turtles-own
" l( s3 J* F9 Y' j) D[
+ I2 `; g3 U7 s  speed     ;; the speed of the turtle8 F' a, }' J- }; R
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
- v$ k* }- ?; S& M" k' p* ^( R# a! A/ P  wait-time ;; the amount of time since the last time a turtle has moved
4 |* X, p5 _! w% }/ ?]
; a4 a* L( ^$ }( H- K
" c: v. l2 J+ X8 M6 `patches-own
2 R3 A3 R! d* d( y& `1 a[
8 ^6 T9 Q( g5 K- d9 i$ V3 T  intersection?   ;; true if the patch is at the intersection of two roads
, p( q8 U- `9 X$ l* t+ Y1 z" G- |  green-light-up? ;; true if the green light is above the intersection.  otherwise, false., m( n0 o4 r/ _) l2 a. N
                  ;; false for a non-intersection patches.
* |" l& A0 N- {2 L  my-row          ;; the row of the intersection counting from the upper left corner of the) ^9 n% y% a3 {( N+ q4 I% g
                  ;; world.  -1 for non-intersection patches.
& s0 E/ y, Y) W( }6 _/ e2 ~  my-column       ;; the column of the intersection counting from the upper left corner of the# \6 l0 j* j0 o; |9 H& w
                  ;; world.  -1 for non-intersection patches.
$ {" L- \, F* e% L  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.3 K- o0 t8 I3 \# O
  auto?           ;; whether or not this intersection will switch automatically.$ e- @- m* x  e# }
                  ;; false for non-intersection patches.
+ R7 n; T& P/ M3 I! e+ E5 J]# N2 m/ M- \9 _/ N9 q3 Y) D/ D
7 [: A% t. w" q( h8 Q( ~7 K

  w2 J5 {7 p5 S) d& ~;;;;;;;;;;;;;;;;;;;;;;
' }4 F" B: U, z  r;; Setup Procedures ;;( X9 i! n0 l$ E( j" j5 G
;;;;;;;;;;;;;;;;;;;;;;0 p6 I0 K7 A. a! E. {) I2 O9 w
. T4 T# Q9 P- s# m! A& P3 G, u
;; Initialize the display by giving the global and patch variables initial values.: ?5 p' m9 R$ i; M0 X3 r9 {& d
;; Create num-cars of turtles if there are enough road patches for one turtle to3 P/ b) u3 d6 x, ?
;; be created per road patch. Set up the plots.
2 i  C1 i* t; t% i6 {$ sto setup
1 \+ F; C/ V) W/ R$ C& }* U* @  ca
8 ^' q) W8 F7 w+ @) Z  setup-globals' ?1 d& ]5 l. q& m/ p

- R/ b# [" e) \8 p  ;; First we ask the patches to draw themselves and set up a few variables1 ]& K# I! J; M6 C7 @" O1 z* s/ _! S
  setup-patches6 d$ y- H) c7 Q! x2 {8 @( p& j
  make-current one-of intersections1 L( j9 \  O3 k! c5 }; F' H
  label-current/ V$ _& i0 x0 S2 I6 ^

+ h' M6 ?( U# q6 F  set-default-shape turtles "car", ?( N4 T9 s3 S  v; G9 _
1 o/ f) k% @# N  @& y
  if (num-cars > count roads)
4 ?  J# T6 a5 t  [
8 C& M7 p) I2 X( o/ S3 i    user-message (word "There are too many cars for the amount of "+ n2 L  E2 b+ _$ S' w: a
                       "road.  Either increase the amount of roads "* G% y1 C; }3 h9 v6 l
                       "by increasing the GRID-SIZE-X or ": c5 E" ~$ o6 t
                       "GRID-SIZE-Y sliders, or decrease the "
6 i# f! \& _+ y9 \; r2 e* C                       "number of cars by lowering the NUMBER slider.\n"
7 Y1 ]/ L5 t4 J9 Y4 z  p; e                       "The setup has stopped."). ]5 M, g3 B+ B" }: m* m# i$ O+ a$ C
    stop
* p4 }, R0 Z% Q. u  ]
2 }- B) I2 n5 Q  t' W% [4 N
6 i, P: w( o1 N% s& K, f  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color+ R% \  Y( A1 }
  crt num-cars' R( |9 C0 k( M& ?# @  ^
  [
& I* N5 Z3 x) E  m0 K; Y    setup-cars
! J& |: i" s9 D' l& O    set-car-color! `' @3 R5 _& G7 E5 l8 r
    record-data
$ J- A$ U( D3 e: M  ]
& N) l9 N/ V8 F6 D# B9 w9 N* H0 R4 Q; r' D* m
  ;; give the turtles an initial speed
# o( e3 c# l. @& m' x4 B. [5 T  ask turtles [ set-car-speed ]) V4 i5 t  V" U

- Y: E  ~' M/ q( S  reset-ticks& ~1 q+ D2 A; S- \
end) }3 X- c- h# U1 Z
; O& R$ R2 J6 @5 T. E+ r/ C  c
;; Initialize the global variables to appropriate values& d# ], S# b0 \' _6 W! C
to setup-globals* }, _5 P1 m' }
  set current-light nobody ;; just for now, since there are no lights yet5 o  q# a" e) `
  set phase 01 q  [" h; f7 ?7 U8 f9 u7 ^
  set num-cars-stopped 0. L% P' W5 p) D( w5 d, q
  set grid-x-inc world-width / grid-size-x
9 }; ?% q: ~) g* d) r  set grid-y-inc world-height / grid-size-y( r0 S' @' N- I+ k3 i# O

# t; g' X0 S: X1 }/ M, i3 y  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
' f" R5 G0 J9 A$ ?2 T  set acceleration 0.099
: x( J6 @3 q. _# m$ Dend
. E5 x8 x# t( a- E  ^' `
  u8 U+ i5 ~' o: u;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
. g3 W3 C/ h4 L2 @;; and initialize the traffic lights to one setting
" u9 u5 j& s# V: P. bto setup-patches! A0 D6 y+ |6 ^7 O
  ;; initialize the patch-owned variables and color the patches to a base-color
, @' l5 B) r$ l, |2 s, ]5 f  ask patches
3 I5 R; g: U+ `% n" ?5 g' G  [. f( V9 c2 G) u/ d! X8 l
    set intersection? false
, S6 Y5 l- T5 g, r! q* q    set auto? false' C8 P, j! ~2 o/ j: m6 y! }2 `1 c6 T
    set green-light-up? true
9 X; v$ s, T3 B, Z# i7 G    set my-row -1
5 |# Y8 b- S7 _# `    set my-column -1
6 P7 Q7 J" `0 Q9 L* L5 R+ J    set my-phase -1( R# Y7 m! y) C( D. ]1 }( u
    set pcolor brown + 3
+ a1 ~* H2 i" M* ?9 s- j  ]2 e0 A0 y9 D5 Y& E3 ?+ e! L' y
: F* H6 F0 o+ j- d/ \
  ;; initialize the global variables that hold patch agentsets, \+ S9 m8 j# U' f& b$ L, z
  set roads patches with+ ?! f3 N& ~! ?( }9 I! z4 |& x/ A( T. w
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
5 K' p: v& X, \# I" q    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
% _; `$ K- \$ ?, l5 R3 B  set intersections roads with
7 g9 o  b: r+ F9 Y/ M+ c0 i/ e    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
/ T9 T& Z* ^8 j* G    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
( [# c+ Q8 h" k- M# m; i6 k  D) ?% F, e& U
  ask roads [ set pcolor white ]; j; f5 |( m  p7 m' w2 ], b
    setup-intersections
( j, {1 f* N) @- ]; lend" s  g  j0 O/ c! @6 r! I8 \/ z
其中定义道路的句子,如下所示,是什么意思啊?  w9 e; t: Z, D: Z6 |
set roads patches with1 v% a7 M4 X; S; X
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
6 \% R- m: ?0 W" O* p8 [    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]5 j/ J% q8 K5 L' q. m& ]* E
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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